Electronic Circuits: Transistor Amplifier

Showing posts with label Transistor Amplifier. Show all posts

Friday, April 1, 2022

140W Class AB Amplifier using MJL4281A and MJL4302A transistors with PCB

Electronic Circuits Amplifier , Circuits to Assemble

Fig. 1 - 140W Class AB Amplifier using MJL4281A and MJL4302A transistors with PCB

Discover High-Fidelity Sound: Build a 140W Class AB Amplifier with MJL4281A and MJL4302A Transistors along with PCB

This is a simple 140W Class AB amplifier using MJL4281A and MJL4302A transistors, which stands out for its simplicity, quality, and is a moderate amplifier to build.

You can be making two of these boards, to be able to work with two outputs, in stereo, and make an amplifier with total power of 280W RMS.

This amplifier works with a simple power supply, that is, a unipolar, non-symmetric power supply.

This amplifier circuit can be used in almost any type of application that requires a simple amplifier, with great performance, low noise and low distortion, and good sound quality.

It uses 2 output power transistors, NPN transistor MJL4281, and PNP transistor MJL4302, forming a pair of complementary transistors.

The Power Transistors

The MJL4281A and MJL4302A transistors are power transistors designed for high power audio, they have a collector-emitter sustaining voltage of 350 V.

It's high gain – 80 to 240, with the hFE = 50 (min) 8A collector current, and a low harmonic distortion, which makes a transistor excellent for high power operation and audio quality.

The Circuit

This circuit has a moderate complexity, it is not recommended for those who have no experience in electronics and in the assembly of amplifier circuits.

You should have minimum knowledge in an intermediate to advanced level to assemble this type of power amplifier.

The schematic diagram of the complete circuit, shown in Figure 2 below, is a very robust amplifier, with great sound quality and very stable, responding very well at all audible frequencies, with little attenuation in the 20Hz to 20Khz hearing frequency range.

Fig. 2 - Schematic Diagram 140W Class AB Amplifier using MJL4281A and MJL4302A transistors

Power supply

The power supply is symmetrical, with a voltage of +45V | 0V | -45V, and direct current, with at least 6 Amps of current. For continuous use, we recommend 4A, especially if used in a subwoofer.

In Figure 3 below, we have a suggestion for a power supply that we use in our projects. In this article, besides having the schematic diagram with the Printed Circuit Board, you will understand how to easily calculate your own Power Supply, with the desired voltage.

You can in the link below:

Symmetrical Power Supply for Power Amplifiers using Calculation + PCB

Fig. 3 - Symmetrical Power Supply for Power Amplifiers

Components List

Semiconductor

Q1, Q2, Q3 .... 2N5551 NPN Transistor
Q4, Q6 ........... BD139 NPN Transistor
Q5, Q7 ........... BD140 PNP Transistor
Q8 .................. MJL4302A NPN Transistor
Q9 .................. MJL4281A NPN Transistor
LED1 ............. Light Emitter Diode (general use)

Resistor

R1, R3 ........... 2K2Ω resistor (red, red, red, gold)
R2, R4, R8 ..... 22KΩ resistor (red, red, orange, gold)
R5, R6 ........... 560Ω resistor (green, blue, brown, gold)
R7 .................. 1K2Ω resistor (brown, red, red, gold)
R9 .................. 1KΩ resistor (brown, black, red, gold)
R10, R11 ....... 3K3Ω resistor (orange, orange, red, gold)
R12, R13 ....... 220Ω resistor (red, red, brown, gold)
R14, R15 ....... 0.22Ω / 5W resistor (red, red, silver, gold)
R16 ................ 10Ω / 1W resistor (brown, black, black, gold)
RP1 ................ 2K Potentiometer

Capacitor

C1 .................. 2.2uF / 25V electrolytic capacitor
C2 .................. 330pF ceramic, polyester capacitor
C3, C5 ........... 100uF / 65V electrolytic capacitor
C4, C6, C7 .... 100nF ceramic, polyester capacitor

Miscellaneous

P1, P2 ............ Screw Terminal Type 5mm 2-Pin Connector
P3 .................. Screw Terminal Type 5mm 3-Pin Connector
Others ............ PCB, tin, wires, heat sink, soldering Iron, etc.

Printed Circuit Board - Download

We are offering the PCB – Printed Circuit Board, in GERBER, PDF and PNG files, for you who want to do the most optimized assembly, either at home.

If you prefer in a company that develops the board, you can is downloading and make the files in the Download option below.

Fig. 3 - PCB - 140W Class AB Amplifier using MJL4281A and MJL4302A transistors

Files to Download, Direct Link:

Click on the link beside: GERBER, PDF and PNG files

I hope you enjoyed it!!!

If you have any questions, suggestions or corrections, please leave them in the comments and we will answer them soon.

Subscribe to our blog!!! Click here - elcircuits.com!!!

My Best Regards!!!

160W High Fidelity Amplifier using Mosfet 2SK1058 and 2SJ162 with PCB

Electronic Circuits Amplifier , Circuits to Assemble

Fig. 1- 160W High Fidelity Amplifier using Mosfet 2SK1058 and 2SJ162 with PCB

This is a High Fidelity power amplifier, which uses 2 pairs of complementary MOSFETs output transistors, 2SK1058 and 2SJ162, which gives us a 160W power output.

The circuit is simple to assemble, assuming you have advanced knowledge in electronics, you will be able to assemble this circuit without too much difficulty.

Basic operation of the circuit

This amplifier has a few many steps, and we could break down each component, but it would certainly be too long, so let's explain the main stage of the amplifier process.

The 160W High Fidelity Amplifier circuit diagram is shown in Figure 2 below. It uses 4 output Mosfet power transistors, 2 transistors for the positive cycle and 2 transistors for the negative cycle.

Fig. 2 - Schematic Circuits 160W High Fidelity Amplifier using Mosfet 2SK1058 and 2SJ162

We will start with first Stage:

It is formed by a pair of MPSA56 PNP transistors, they form the input of the differential amplifier.

The main characteristic is to amplify the difference of the input signals without amplifying the common mode signal.

In the second stage:

We have two pairs of transistors, 2 NPN BD139 transistors and 2 PNP TIP140 transistors, they constitute a differential current source pair formed by the BD139 transistors pair. And with a current mirror formed by the BD140 transistors pair, in Cascade mode creating a telescopic amplifier stage.

In the third stage:

It is formed by the 4 Output MOSFETs transistors, two N-channel type transistors 2SK1058 and other two P-channel type transistors 2SJ162. They receive the signal from stage 2 which is a module in Cascade, as already explained, and deliver to the output load, formed by the speaker.

The output transistors should be equipped with a Heat Sink, and should be electrically separated with thermal insulators.

Power Supply

The power supply is a symmetrical source, +Vdc GND -Vdc, and must contain a current capable of supporting the total power of the Amplifier.

If the circuit is used in MONO mode "One channel", the recommended current is 4 Amperes. If a STEREO version "Two channels" is used, the current should be doubled to 8 Amperes.

The amplifier work voltage is ±45Vdc SYMMETRICAL, to be used with an output load between 4 to 8 ohms.

You can in the link below:

Symmetrical Power Supply for Power Amplifiers using Calculation + PCB

Fig. 3 - Symmetrical Power Supply for Power Amplifiers

Components List

Semiconductors
Q1 .......................... MPSA56 PNP Transistor
Q3, Q4 ................... BD139 NPN Transistor
Q5, Q6 ................... BD140 PNP Transistor
Q7, Q8 ................... 2SK1058 N-Channel Mosfet Transistor
Q9, Q10 ................. 2SJ162 P-Channel Mosfet Transistor
D1, D2 ................... 1N4007 Diode

Resistor
R1, R2, R10 ................ 47KΩ (yellow, violet, orange, gold)
R3, R4 ........................ 3K3Ω (orange, orange, red, gold)
R5 ............................... 1K2Ω (brown, red, red, gold)
R6 ............................... 10KΩ (brown, black, orange, gold)
R7, R8 ........................ 1KΩ (brown, black, red, gold)
R9 ............................... 2K2Ω (red, red, red, gold)
R11, R12, R13, R14 ... 47Ω (yellow, violet, black, gold)
R15, R16, R17, R18 ... 022Ω (red, red, silver, gold)
R19 ............................. 10Ω (brown, black, black, gold)
Capacitor
C1 ........................ 4.7uF / 65V Electrolytic Capacitor
C2, C4, C5 ........... 470pF Ceramic Capacitor
C3 ........................ 47uF / 65V Electrolytic Capacitor
C6 ........................ 100nF Ceramic Capacitor

Miscellaneous
P1, P2 .......... 2-pin PCB soldering terminal blocks
P3 ................ 3-pin PCB soldering terminal blocks
Others ......... PCB, heat sink, power supply, wires, etc.

We are offering the PCB - Printed Circuit Board, in GERBER, PDF and PNG files, for you who want to do the most optimized assembly, either at home.

If you prefer in a company that develops the board, you can is downloading and make the files in the Download option below.

Fig. 3 - PCB 160W High Fidelity Amplifier using Mosfet 2SK1058 and 2SJ162

Files to download, Direct Link:

Click Here to Download the Files

If you have any questions, suggestions or corrections, please leave them in the comments and we will answer them soon.

Subscribe to our blog!!! Click Here - elcircuits.com!!!

My Best Regards!!!

Powerful Mini Audio Amplifier using only 5 Transistors with PCB

Electronic Circuits Amplifier , Circuits to Assemble

Fig 1 - Powerful Mini Audio Amplifier using only 5 Transistors with PCB

This is a simple amplifier that uses only 5 transistors, and provides good power, by our tests, we get close to 90W, and amazingly enough, it has a very good sound given its ultra simplicity.

The circuit is quite simple, and very easy to building, which makes it a great option for those who want to build an amplifier with good power and great cost, because it uses discrete components, cheap and easy to acquire.

The Amplifier Circuit

The amplifier circuit is very simple to assemble, as shown in Figure 2 just below, this amplifier is divided into three basic stages:

The first is the pre-amplification stage: It is formed by a differential pair set of NPN 2N5551 transistors, they are working as differential pair, which gives a very good stability in the signal sent to the next stage.
The second is the driver stage: it is formed by the PNP TIP42 transistor, it is used as a current amplifier and serves to drive the output stage.
The third is the power stage: It is formed by a pair of differential power transistors, one is the NPN 2SC5200 and the other is the 2SA1943, they are in push-pull mode, configured to work in class AB, with base BIAS diodes.

Fig. 2 - Schematic diagram Powerful Mini Audio Amplifier using only 5 Transistors

Note

Place the power transistors on a heat-sink, because since you work with power, they will get hot, a small size radiator will help.

For those who like loud sound, to really force the amplifier to the maximum, it is recommended to put the BIAS diodes in series, on the heat sink along with the transistors. This will cause the base voltage to be controlled according to the temperature of the transistors.

Power Supply

The power is supplied through a 24 VAC transformer, after rectification the supply will provide 35 VDC. The current to power this amplifier is at least 3A, for those mounting two of these to form a stereo pair, you should double the current to 6 Amps.

Component List

Semiconductor

Q1, Q2 .......... 2N5551 NPN Transistor
Q3 ................. PNP BD140 Transistor
Q4 ................. 2SC5200 NPN Power complementary transistor
Q5 ................. 2SA1943 PNP Power complementary transistor
D1, D2, D3 ... 1N4007 Diode

Resistors

R1, R5 .......... 100K ohms Resistor - (brown, black, yellow, gold)
R2 ................. 6K8 ohms Resistor - (blue, gray, red, gold)
R3 ................. 620 ohms Resistor - (blue, red, brown, gold)
R4.................. 4K7 ohms Resistor - (yellow, violet, red, gold)
R6 ................. 1k5 ohms Resistor - (brown, green, red, gold)
R7, R8 ........... 0.22 ohms - 5W Resistor - (red, red, silver, gold)
P1 .................. 10K ohm potentiometer

Capacitors

C1 ................ 2.2uF Polyester / Ceramic Capacitor
C2 ................ 47uF - 65V Electrolytic capacitor

Miscellanies

P1 ................. Screw Terminal Type 5mm 2-Pin Connector
P2 ................. Screw Terminal Type 5mm 3-Pin Connector
J1 .................. Set of male connectors 2-Pin (Optional)
Other ............. PCB, Wires, Speaker, Heat Sink, etc.

Printed Circuit Board

In Figure 3, we provide the PCB - Printed Circuit Board, in GERBER, PDF and PNG files. These files are available for free download, on the MEGA server, in a direct link, without any bypass.

All to make it easier for you to do a more optimized assembly, either at home, or with a company that prints the board. You can download the files in the Download option below.

Fig. 3 - PCB - Powerful Mini Audio Amplifier using only 5 Transistors

Files to download, Direct Link:

Click on the link beside: GERBER, PDF and PNG files

If you have any questions, suggestions or corrections, please leave them in the comments and we will answer them soon.

Subscribe to our blog!!! Click Here - elcircuits.com!!!

My Best Regards!!!

440W Class AB Power Amplifier using Mosfet IRFP9240 and IRFP240 Transistors with PCB

Electronic Circuits Amplifier , Circuits to Assemble

Fig. 1 - 440W Class AB Power Amplifier using Mosfet IRFP9240 and IRFP240 Transistors with PCB

This is a high performance power amplifier, which despite its simplicity in construction, in the tests performed, it presented parameters with great results, very close to what we call a HI-FI amplifier.

The Circuit Works

The complexity of the circuit is at an advanced level, it is not recommended for those who don't have experience in electronics and in assembling amplifier circuits, you must have minimal knowledge at an advanced level to assemble this type of power amplifier.

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The circuit diagram of the power amplifier is shown in Figure 2 below. It uses 8 output Mosfet power transistors, 4 transistors for the positive cycle and 4 transistors for the negative cycle.

Fig. 2 - Schematic diagram 440W Class AB Power Amplifier using Mosfet IRFP9240 and IRFP240 Transistors

The input circuit consists of a TL431 Op-Amp, it is used as a feed-forward preamplifier for the driver circuit units that produce a primary voltage gain at the output stage.

The circuit is divided into 2 identical half-cycles: one side for the positive half-wave of the signal fed through driver transistor Q1 NPN BD139, which feeds the output transistors (Q3, Q5, Q7, Q9 ) P-Channel IRFP9240, the other side for the negative half-wave of the signal fed through driver transistor Q2 PNP BD140, which feeds the output transistors (Q4, Q6, Q8, Q10) N-Channel IRFP240.

The Power Supply

The power supply is of the symmetrical type, with a supply voltage of +55V | 0V | -55V, with a current of 10 Amperes, with good filtering.

You can in the link below:

Symmetrical Power Supply for Power Amplifiers using Calculation + PCB

Fig. 3 - Symmetrical Power Supply for Power Amplifiers

Components List

Semiconductors
U1 .......................... TL071 Integrated Circuit
Q1 .......................... BD139 NPN Transistor
Q2 .......................... BD140 PNP Transistor
Q3, Q4, Q5, Q6 ..... IRFP9240 Mosfet Transistor
Q7, Q8, Q9, Q10 ... IRFP240 Mosfet Transistor
D1, D2 ................... 1N4744 15V Zener diode
D3, D4 ................... 1N4148 diode

Resistor
R1, R33 ................. 47KΩ (yellow, violet, orange, gold)
R2 .......................... 1KΩ (brown, black, red, gold)
R3, R4 .................... 2K7Ω (red, violet, red, gold)
R5, R6 .................... 2KΩ (red, black, red, gold)
R7 ........................... 6k8Ω Trimpot
R8, R9 .................... 22KΩ (red, red, orange, gold)
R10, R11 ................ 33Ω (orange, orange, black, gold)
R12, R13 ................ 220Ω (red, red, brown, gold)
R14, R5 .................. 820Ω ( grey, red, brown, gold)
R16 ......................... 3.3Ω (orange, orange, gold, gold)
R17, R18, R21, R22, R25, R26, R29, R30 .... 39Ω (orange, white, black, gold)
R19, R20, R23, R24, R27, R28, R31, R32 .... 5W 0.33Ω (orange, orange, silver, gold)
Capacitor
C1, C5 .................... 100pF Ceramic Capacitor
C2, C6, C7 .............. 1uF Ceramic Capacitor
C3, C4, C9, C10 ..... 470uF / 65V Electrolytic Capacitor
C8 ........................... 100nF Ceramic Capacitor

Miscellaneous
P1 .......... 2-pin PCB soldering terminal blocks
P2 .......... 3-pin PCB soldering terminal blocks
Others .... Printed Circuit Board, heat sink, wires, etc.

We are offering the PCB - Printed Circuit Board, in GERBER, PDF and PNG files, for you who want to do the most optimized assembly, either at home, or if you prefer in a company that develops the board, you can is downloading and make the files in the Download option below.

Fig. 3 - 440W Class AB Power Amplifier using Mosfet IRFP9240 and IRFP240 Transistors

Files to Download, Direct Link:

Click on the link beside: GERBER, PDF and PNG files

If you have any questions, suggestions or corrections, please leave them in the comments and we will answer them soon.

Subscribe to our blog!!! Click Here - elcircuits.com!!!

My Best Regards!!!

400W Class AB Amplifier using MJL4281A and MJL4302A transistors + PCB

Electronic Circuits Amplifier , Circuits to Assemble

Fig. 1 - 400W Class AB Amplifier using MJL4281A and MJL4302A transistors + PCB

The amplifier circuit is 400W RMS per channel, if you want to make two of these boards, they will be 800W RMS, that is, high power with great sound quality and stability.

This amplifier circuit can be used for virtually any type of application that requires an amplifier of high performance, low noise and low distortion, and excellent sound quality.

It uses 4 power transistors on the output; two NPN transistors MJL4281 and two PNP MJL4302, forming a double pair of complementary transistors.

The Power Transistors

The MJL4281A and MJL4302A transistors are power transistors designed for high power audio, they have a collector-emitter sustaining voltage of 350 V, high gain - 80 to 240, with the hFE = 50 (min) 8A collector current. And a low harmonic distortion, which makes a transistor exceptional for high power operation and audio quality.

The Circuit

The complexity of the circuit is at an advanced level, it is not recommended for those who do not have experience in electronics and in assembling amplifier circuits, you must have minimal knowledge at an advanced level to assemble this type of power amplifier.

The schematic diagram of the complete circuit, shown in Figure 2 below, is a very robust amplifier, with great sound quality, and very stable, responding very well at all audible frequencies, with little attenuation in the auditory frequency range 20Hz to 20Khz.

Fig. 2 - Schematic 400W Class AB Amplifier using MJL4281A and MJL4302A transistors

Power supply

The power supply is symmetrical, with a voltage of +65V | 0V | -65V, and direct current, with at least 6 Amps of current. For continuous use, we recommend 8A, especially if used in a subwoofer.

You can in the link below:

Symmetrical Power Supply for Power Amplifiers using Calculation + PCB

Fig. 3 - Symmetrical Power Supply for Power Amplifiers

Components List

Q1, Q2 ............ 2N5401 PNP Transistor
Q3, Q4, Q5 ..... 2N5551 NPN Transistor
Q6, Q7 ............ MJE340 NPN Transistor
Q8 ................... TIP41 NPN Transistor
Q9 ................... TIP42 PNP Transistor
Q10, Q11 ......... MJL4281 NPN Transistor
Q12, Q13 ......... MJL4302 NPN Transistor
D1, D2 ............. 1N4007 Diode
R1 .................... 56KΩ resistor (green, blue, orange, gold)
R2, R3, R14 ..... 100Ω resistor (brown, black, brown, gold)
R4 .................... 47KΩ resistor (yellow, purple, orange, gold)
R5 .................... 120Ω resistor (brown, red, brown, gold)
R6 .................... 1K2Ω resistor (brown, red, red, gold)
R7, R12 ............ 680Ω resistor (blue, gray, brown, gold)
R8 ..................... 68KΩ resistor (blue, gray, orange, gold)
R9, R11 ............ 4K7Ω resistor (yellow, red, purple, gold)
R10 .................. 3K9Ω resistor (orange, white, red, gold)
R13 .................. 10Ω resistor (brown, black, black, gold)
R15 .................. 180Ω / 1W resistor (brown, gray, brown, gold)
R16 to R23 ....... 0.22Ω /5W resistor (red, red, gold, silver)
R24, R25 .......... 10Ω / 1W resistor (brown, black, black, gold)
RP1 .................. 1K Potentiometer

C1 ........................ 4.7uF / 25V electrolytic capacitor
C2, C7 ................. 100pF ceramic, polyester capacitor
C3, C4, C5, C6 .... 47uF / 50V electrolytic capacitor
C8 ........................ 100nF ceramic, polyester capacitor
L1 ................ 5uH - Air Core Coil 10 Turns 18AWG, 3/8" Core
P1, P2 ........... Screw Terminal Type 5mm 2-Pin Connector
P3 ................. Screw Terminal Type 5mm 3-Pin Connector

Others ............ PCB, tin, wires, heat sink, soldering Iron, etc.

We are offering the PCB - Printed Circuit Board, in GERBER, PDF and PNG files, for you who want to do the most optimized assembly, either at home.

If you prefer in a company that develops the board, you can is downloading and make the files in the Download option below.

Fig. 4 - PCB - 400W Class AB Amplifier using MJL4281A and MJL4302A transistors

Files to download, Direct Link:

Click on the link beside: GERBER, PDF and PNG files

If you have any questions, suggestions or corrections, please leave them in the comments and we will answer them soon.

Subscribe to our blog!!! Click Here - elcircuits.com!!!

My Best Regards!!!

Simple 100W Power Amplifier using TIP142 NPN and TIP147 PNP transistors + PCB

Electronic Circuits Amplifier , Circuits to Assemble

Fig 1 - PCB 100W Power Amplifier - TIP142 and TIP147 Transistors

This is a low complexity amplifier, which can be easily assembled by anyone who has basic knowledge in electronics.

This amplifier works with a Class B output stage with a complementary output pair formed by the TIP142 and TIP147 Darlington Transistors.

Operation

The input stage, is formed by a differential pair Q1 and Q2, which are two PNPs A733 transistors, the Q1 transistor receive the input signal for amplification, and Q2 receives the Feedback signal.

Thus assembling a signal loop making with the differential amplifier to control the signal giving stability to the amplifier and avoiding distortion in the circuit.

The second stage consists of a TIP41 transistor, which functions as a Drive, which receives the signal from the differential pair and amplifies it to delivery a sufficient current at the base of the output transistors.

Diodes D1, D2 and D3 determine the base polarization voltage in the transistors.

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This amplifier has an output power of approximately 100 watts, to get this output power will depend on the Power Supply voltage, with a supply voltage of + 50V / - 50V, with a current of 3A.

In our tests, it was possible to get a little more than 100W. The schematic diagram circuit, is in Figure 2 below, it is a very simple circuit to build, with few external components.

However, be careful, it works with a total voltage of 90V, be careful not to change any component polarity, don't short the amplifier circuit.

Fig 2 - Schematic Simple 100W Power Amplifier with TIP142 NPN and TIP147 PNP transistors

Power supply

The power supply for this circuit amplifier is symmetrical, in our tests a Transformer with a +36V 0V -36V AC, center-tape was used, with a current 3 Amperes, after the CA voltage goes through the rectification, it will average 50V DC.

Components List

Semiconductor

Q1, Q2 .... A733 - PNP transistor
Q3 ........... TIP41C - NPN transistor
Q4 ........... TIP142 - NPN power transistor
Q5 ............TIP147 - PNP power transistor
D1, D2 .... 1N4007 - Diode

Resistors

R1, R2 ..... 22K ohms - 1/8W - Resistor - (red, red, orange, gold)
R3 ........... 1K5 ohms - 1/8W - Resistor - (brown, green, red, gold)
R4 ........... 220 ohms - 1/8W - Resistor - (red, red, brown, gold)
R5 ........... 27K ohms - 1/8W - Resistor - (red, violet, orange, gold)
R6 ........... 27 ohms - 1/8W - Resistor - (red, violet, black, gold)
R7, R8 .... 3K3 ohms - 1W - Resistor - (orange, orange, red, gold)
R9, R10 ... 022 ohms - 3W - Resistor - (red, red, gold, silver)

Capacitors

C1 .......... 2.2uF - 25V - Electrolytic capacitor
C2 .......... 100uF - 63V - Electrolytic capacitor
C3 .......... 10uF - 63V - Electrolytic capacitor

Miscellaneous

P1, P2 ..... Block 5mm 2 Pin weldable terminal Connector
P3 ........... Block 5mm 3 Pin weldable terminal Connector
Others .... Printed Circuit Board, Wires, Solders, Etc.

We are offering the PCI - Printed Circuit Board, in GERBER, PDF and PNG files, for you who want to do the most optimized assembly, either at home.

If you prefer in a company that develops the board, you can is downloading and make the files in the Download option below.

Files to download, Direct Link:

Click on the link beside: GERBER, PDF and PNG files

If you have any questions, suggestions or corrections, please leave them in the comments and we will answer them soon.

Subscribe to our blog!!! Click here - elcircuits.com!!!

My Best Regards!!!

200W RMS Power Amplifier using 2SC2500 AND 2SA1943 transistors + PCB

Electronic Circuits Amplifier , Circuits to Assemble

Fig. 1 - 200W RMS Power Amplifier using 2SC2500 AND 2SA1943 transistors

For Portuguese version, click here!

This Power Amplifier have a moderate sound quality, and it's a simple circuit to assemble, using 4 complementary output transistors, 2 x NPN 2SC2500 and 2 x PNP 2SA1943.

This amplifier is quite common to find and it has a good sound quality, uses specific power transistors for audio, making these amplifiers a good circuit amplifier to building.

You might also be interested in:

This is a power amplifier, posted by our partner fvml.com.br, we are authorized to replicate any post, so we took these posts from them and implemented the volume control and changed the layout a little. This partnership allows us to do this, and they are also free to repost our posts.

The circuit is supplied with a symmetrical power supply and can be supplied with a voltage between 30V to 65V, for greater performance you must use the 60V, with at least current 4 Amperes.

The schematic diagram is shown in Figure 2 below, it is a simple amplifier, and often found on the internet for sale, it has a good quality and complies with the promised power.

Fig. 2 - 200W RMS Power Amplifier with 2SC2500 and 2SA1943

Power supply

The power supply for this circuit amplifier is symmetrical, in our tests a Transformer with a 42V - 0 - 42V center-tape was used, with a 5 Amperes current, you can use a lower current, up to 4 Amps minimum, which will play perfectly.

Nothing prevents you from using a lower voltage, as this amplifier has a tolerance regarding its supply voltage, and can normally play "with loss in output power" with voltages ranging from 24V to 60V without too many problems.

Components List

Q1, Q2, Q3 .................. A1015 - PNP transistor
Q5, Q6 ......................... TIP41C - NPN transistor
Q4, Q7 ......................... TIP42C- PNP transistor
Q8, Q10 ....................... 2SC5200 - NPN power transistor
Q9, Q11 ....................... 2SA1943 - PNP power transistor
D1, D2, D3, D4, D5 .... 1N4007 - Diode
P1 ................................ 47K - Potentiometer
C1 ............................... 2.2uF - 25V - Electrolytic capacitor
C2 ............................... 47uF - 63V - Electrolytic capacitor
C3 ............................... 330pF - Ceramic / polyester capacitor
C4 ............................... 100nF ceramic / polyester capacitor
R1 ............................... 10K ohms - 1 / 4W - Resistor - (brown, black, orange)
R2 ............................... 18k ohms - 1 / 4W - Resistor - (brown, gray, orange)
R3 ............................... 820 ohms - 1 / 4W - Resistor - (gray, red, brown)
R4 ............................... 270 ohms - 1W - Resistor - (red, violet, brown)
R5 ............................... 1K ohms - 1 / 4W - Resistor - (brown, black, red)
R6 ............................... 18K ohms - 1 / 4W - Resistor - (brown, gray, orange)
R7 ............................... 330 ohms - 1 / 4W - Resistor - (orange, orange, brown)
R8 ............................... 56 ohms - 1W - Resistor - (green, blue, black)
R9 ............................... 27 ohms - 1W - Resistor - (red, violet, black)
R10, R11 .................... 6R8 ohms - 1W - Resistor - (blue, gray, gold)
R12, R13 .................... 100 ohms - 1W - Resistor - (brown, black, brown)
R14, R15, R16, R17 ... 033 ohms - 5W - Resistor - (orange, orange, gold)
R18, R19 .................... 10 ohm resistor - 1W - (brown, black, black)
B1, B2 ........................ WJ2EDGVC-5.08-2P Connector
B3 ............................... WJ2EDGVC-5.08-3P connector
L1 ............................... Coil - 5uH Air Core
Others ......................... Printed Circuit Board, Wires, Solders and Etc.

We are offering the PCB - Printed Circuit Board, in GERBER, PDF and PNG files, for you who want to do the most optimized assembly, either at home.

If you prefer in a company that develops the board, you can is downloading and make the files in the Download option below.

Files to download, Direct Link:

Click on the link beside: GERBER, PDF and PNG files

If you have any questions, suggestions or corrections, please leave them in the comments and we will answer them soon.

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300W RMS Power Amplifier - 2SC3858 and 2SA1494 Transistors + PCB

Electronic Circuits Amplifier , Circuits to Assemble

Fig. 1 - PCB 300W RMS Power Amplifier - 2SC3858 and 2SA1494 Transistors

For Portuguese version, click here!

This is a 300W RMS Power Amplifier using complementary power transistors 2SC3858 and 2SA1494, this circuit amplifier isn't so simple to building, it will be necessary to have at least a little experience in electronics.

To set up this circuit, its complexity is moderate, but, if you haven't skills in electronics circuits, we advise you not to do it, however, if you really want to do it, call someone with experience, to help you.

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This amplifier has an excellent audio quality, and use four output power transistors, it reaches a sound power of 300W RMS under load of 4 ohms, powered with a symmetric power supply. You can check the schematic diagram in Figure 2 below.

Fig. 2 - Schematic 300W RMS Power Amplifier - 2SC3858 and 2SA1494 Transistors

Power Supply

The power supply consists of a symmetrical transformer 45V - 0 - 45V center tape, 6 Amperes current supply, can be used. After rectified, we will have approximately 63Vcc at the output of the symmetrical power supply .

Components list

Q1, Q2, Q3, Q5 ......... C1815 NPN Transistor
Q4 .............................. A1015 PNP Transistor
Q7 .............................. TIP 42C PNP Transistor
Q8, Q9 ....................... 2SC3858 NPN Power Transistor
Q10, Q11 ................... 2SA1494 PNP Power Transistor
Q6 .............................. TIP41C NPN Transistor
D1 to D7 .................... 1N4148 diode, or equivalent diode 1N4001
C1, C4 ......................... 2.2uF - 25V Electrolytic Capacitor
C2 ............................... 220pF Polyester / Ceramic Capacitor
C8 ............................... 100nF Polyester / Ceramic Capacitor
R2, R10 ....................... 47k ohms resistor (yellow, violet, orange, gold)
R3, R5 ......................... 2.2k ohms resistor (red, red, red, gold)
R4 ................................ 270 ohms resistor (red, violet, black, gold)
R6, R7 ......................... 51K ohms - 1/2W resistor (green, brown, orange, gold)
R8, R9, ........................ 100 ohms resistor (brown, brown, black, gold)
R11 .............................. 470 ohms resistor (yellow, violet, brown, gold)
R12 .............................. 390 ohms resistor (orange, white, brown, gold)
R13, R14 ..................... 100 ohms - 2W resistor (brown, brown, black, gold)
R17, R18 ...................... 6R8 ohms - 1W resistor (blue, gray, gold, gold)
R15, R16, R19, R20 .... 100 ohms - 1W resistor (brown, brown, black, gold)
R21, R22, R23, R24 .... 0.33 ohms - 5W resistor (orange, orange, gold, gold)
R25 .............................. 22 ohms resistor (red, red, black gold)
R26 .............................. 10 ohms - 1W resistor - (brown, black, black. gold)
P1, P2 ....... 2 Pin - PCB Terminal Blocks - EK500V-XXP 20A - or equivalent
P3 ............. 3 Pin - PCB Terminal Blocks - EK500V-XXP 20A - or equivalent
L1 ............. 5uH - Air Core Coil 10 Turns 18AWG, 3/8" Core
Others ...... Loudspeaker, Wires, Solders and Etc.

For those who want to download materials such as the schematic diagram in PDF, PCB Layout, GERBER and JPG, we are providing a direct link to download all the material.

Direct link to download

Click in the link below to download the Files: PCB Layout, PDF, GERBER, JPG

If you have any questions, suggestions or corrections, please leave them in the comments and we will answer them soon.

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My Best Regards!!!

50W RMS Audio Amplifier with IRF530 and IRF9530 Mosfet + PCB

Electronic Circuits Amplifier , Circuits to Assemble

Fig. 1 - PCB 50W Audio Amplifier

For Portuguese version, click here!

This circuit amplifier is very simple to building, however, although simple, it has an excellent audio quality, and with just two output transistors, it reaches a sound power of 50W RMS under load of 8 ohms, which is enough for a great home sound system, or for speakers for musical instruments ... the possibilities are endless.

The first stage of the amplifier is a differential amplifier based on the transistors Q1 and Q2. Capacitor C2 is the input DC decouple, R1 limits the input current and capacitor C1 deflects unwanted high frequencies.

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The second stage is the drive stage composed of the transistor Q3 BC546, which supplies the output power stage, and the transistor Q4 is the bias regulating transistor, which, through the PR1 trimpot, adjusts the quiescent current in the transistors.

The output stage is a complementary push-pull stage based on the IRF530 and IRF9530 MOSFETs. The output is coupled to the speaker using the L1 inductor.

The network composed in series by hairs, resistor R14 and capacitor C5, is intended to reduce output noise. And Capacitors C6 and C7 are power supply voltage filters.

For coil L1: Wrap 12 turns of enameled copper wire in a 1cm diameter without core.

A Heatsink is required for MOSFETs. That should have the average dimensions of 8x4x4 inches will already work without problems.

You can check the schematic diagram in Figure 2 below.

Fig. 2 - 50 Watt Amplifier Circuit Diagram

Power Supply

The power supply consists of a symmetrical transformer 35Vcc - 0 - 35V center tape, with a current of 3 Amperes, a lower current, up to 2 Amperes minimum, can be used, which will play without any problems.

Nothing prevents you from using a higher or lower voltage, as this amplifier has a tolerance for the supply voltage, and can normally play "with small attenuations in the output power" with voltages ranging from 27V to 40V without too many problems.

It also has great stability and we can use, if you have, a SMPS power supply, and this is clear with Center-Tape, that is to say a power supply with central socket.

Component List

Q1, Q2 ................ 2N3906 Transistor (or BC558, A733)
Q3, Q4 ................ 2N3904 Transistor (or BC548)
Q5 ....................... IRF9530P Mosfet P Transistor
Q6 ....................... IRF530P Mosfet N Transistor
D1 ....................... 1N4007 Diode
C1 ....................... 220pF ceramic / polyester capacitor
C2, C3, C4 .......... 47uF - 35V electrolytic capacitor
C5 ....................... 68nF ceramic / polyester capacitor
C6, C7 ................ 470uF - 50V electrolytic capacitor
R1, R8 ................ 4.7k ohms resistor (yellow, violet, red, gold)
R2, R7 ................ 47k ohms resistor (yellow, violet, orange, gold)
R3 ....................... 560 ohms resistor (green, blue, brown, gold)
R4 ....................... 15k ohms resistor (brown, green, orange, gold)
R5 ....................... 1.2k ohms resistor (brown, red, red, gold)
R6 ....................... 2.2k ohms resistor (red, red, red, gold)
R9 ....................... 10k ohms resistor (brown, black, orange, gold)
R10 ..................... 820 ohms resistor (gray, red, brown, gold)
R11, R12 ............ 2.7k ohms resistor (red, violet, red, gold)
R13, R14 ............ 680 ohms resistor (blue, gray, brown, gold)
R15 ..................... 10 ohm - 3W resistor - (brown, black, black. gold)
L1 ........................ 5uH - Air Core Coil 10 Turns 18AWG, 3/8" Core
RP1 ..................... 1K ohms variable resistor - Trimpot
Others ................. Loudspeaker, Wires, Solders and Etc.

For those who want to download materials such as the schematic diagram in PDF, PCB Layout, GERBER and JPG, we are providing a direct link to download all the material.

Direct link to download

Click in the link below to download the Files: PCB Layout, PDF, GERBER, JPG

If you have any questions, suggestions or corrections, please leave them in the comments and we will answer them soon.

Subscribe to our blog!!! Click here - elcircuits.com!!!

My Best Regards!!!

Friday, April 1, 2022

Discover High-Fidelity Sound: Build a 140W Class AB Amplifier with MJL4281A and MJL4302A Transistors along with PCB

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The Power Transistors

The Circuit

Power supply

Components List

Printed Circuit Board - Download

Files to Download, Direct Link:

I hope you enjoyed it!!!

Wednesday, February 23, 2022

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Basic operation of the circuit

We will start with first Stage:

In the second stage:

In the third stage:

Power Supply

Components List

Files to download, Direct Link:

Wednesday, February 16, 2022

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The Amplifier Circuit

Note

Power Supply

The power is supplied through a 24 VAC transformer, after rectification the supply will provide 35 VDC. The current to power this amplifier is at least 3A, for those mounting two of these to form a stereo pair, you should double the current to 6 Amps.

Component List

Printed Circuit Board

Files to download, Direct Link:

Tuesday, February 8, 2022

The Circuit Works

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The Power Supply

Components List

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Tuesday, December 14, 2021

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The Power Transistors

The Circuit

Power supply

Components List

Files to download, Direct Link:

Monday, May 24, 2021

Operation

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Power supply

Components List

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Friday, May 21, 2021

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Power supply

Components List

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Sunday, April 18, 2021

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Power Supply

Components list

Direct link to download

Thursday, April 1, 2021

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Power Supply

Component List

Direct link to download

Data Cross-Reference Tool: Find the Equivalent Transistor with Ease!

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