Showing posts with label Transistor Amplifier. Show all posts
Showing posts with label Transistor Amplifier. Show all posts

Friday, April 1, 2022

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

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.

You might also be interested in:

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:

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!!!

Wednesday, February 23, 2022

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

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.

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:

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:


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!!!

Wednesday, February 16, 2022

Powerful Mini Audio Amplifier using only 5 Transistors with PCB

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.

You might also be interested in:

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 VDCThe 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!!!

Tuesday, February 8, 2022

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


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.

You might also be interested in:

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. 

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:

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!!!


Tuesday, December 14, 2021

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

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.

You might also be interested in:

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.

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:

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!!!