• High output power capability:
• 4 x 50W / 4Ω max.
• 4 x 30W / 4Ω @ 14.4 V, 1 kHz, 10 %
• 4 x 80W / 2Ω max.
• 4 x 55W / 2Ω @ 14.4V, 1 kHz, 10 %
• MOSFET output power stage
• Excellent 2Ω driving capability
• Hi-Fi class distortion
• Low output noise
• ST-BY function
• Mute function
• Auto mute at min. supply voltage detection
• Low external component count:
• Internally fixed gain (26 dB)
• No external compensation
• No bootstrap capacitors
• On board 0.35 A high side driver
  

In Figure 2 below, we have available the schematic diagram of the 14V 4 Channel 200W MOSFET power amplifier circuit, this circuit is quite simple to assemble.

As we can see there are very few external components, making the circuit very simple to assemble, even for a technician or hobbyist with little experience in electronics can assemble it without much difficulty. 

Fig. 2 - Diagram 14V 4 Channel 200W MOSFET Quad Bridge Power Amplifier using TDA7850

It is important to remember to be careful when assembling the circuit, as simple as the circuit is. We must be careful not to invert any components, such as capacitors, or invert the input voltage of the circuit, because the integrated circuit or other components can be damaged easily.

Components List

• Semiconductors
• U1 ............ TDA7850 Integrated Circuit 
  
  
• Resistors
• R1 ............ 47KΩ Resistor (yellow, violet, orange, gold)
• R2, R3 ..... 10K resistor (brown, black, orange, gold)
  
  
• Capacitors
• C1 to C4 ... 220nF Ceramic/Polyester Capacitor
• C5, C6 ...... 1μF Ceramic/Polyester Capacitor
• C7 ............. 470nF Ceramic/Polyester Capacitor
• C8 ............. 47μF / 25V Electrolytic Capacitor
• C9 ............. 2.200μF / 25V Electrolytic Capacitor
• C10 ........... 100nF Ceramic/Polyester Capacitor
  
  
• Miscellaneous
• P1 to P9 .... Screw Terminal Type 5mm 2-Pin Connector
• Other ........ PCB, Wires, Speaker, etc.
  

Power Supply

This amplifier is powered by unipolar source, with direct current, the maximum current required by the circuit is approximately 15 Amperes.

And you can connect it directly to a car battery, or a motorcycle battery, or a no-break battery, or a bench power supply... 

The power will be according to the power supply, and as already shown in the IC features above, to have 4 outputs of 50W we have to supply the circuit with 14.4V. 

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 14V 4 Channel 200W MOSFET Quad Bridge Power Amplifier using TDA7850

Files to Download, Direct Link:

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.

• 160W High Fidelity Amplifier using Mosfet 2SK1058 and 2SJ162 with PCB
• 440W Class AB Power Amplifier using Mosfet IRFP9240 and IRFP240 with PCB
• 200W RMS Power Amplifier With 2SC2500 AND 2SA1943 + PCB
• 300W RMS Power Amplifier - 2SC3858 and 2SA1494 Transistors + PCB
• 50W RMS Audio Amplifier with IRF530 and IRF9530 Mosfet + PCB
• 100W RMS Power Amplifier With 2 NPN 2SC5200 Transistors At Output + PCB
• Simple 3 Transistors Power Amplifier push a 600W RMS Subwoofer + PCB
  

• 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.
  

I hope you enjoyed it!!!

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:

Power Supply

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

• 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!!!

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

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!!!

LM3876 Integrated Circuit Description

Feature

The Schematic Circuit

In Figure 2 below we have components arrangement of the power amplifier circuit with the LM3876 IC, and as we can see, the difficulty is not extreme. 

Since there are few external components, making the amplifier circuit very simple to assemble, and a technician or hobbyist with medium experience can assemble it without much difficulty. 

Fig. 2 - Schematic Circuit High Performance 56W Audio Power Amplifier using LM3876 IC

It is important to remember to be careful when assembling the circuit, not to invert any component such as capacitor diodes, or even when connecting the symmetrical voltage of the power supply. Not to invert the voltage poles, because the integrated circuit or other components can be damaged.

The coil is formed is a 5uH coil, for those who are going to assemble it, you can assemble it with 10 turns of 18 AWG Wire with a 3/8" air core.

Components List

• Semiconductors
• U1 .............. LM3876 Integrated Circuit
  
  
• Resistors
• R1, R5 ....... 1K resistor (brown, black, red, gold)
• R2, R3 ....... 18K resistor (brown, gray, orange, gold)
• R4 .............. 10K resistor (brown, black, orange, gold)
• R6, R7 ....... 22K resistor (red, red, orange, gold)
• R8 .............. 100Ω resistor (brown, black, brown, gold)
• R9 .............. 10Ω / 1W resistor (brown, black, black, gold)
• RP1 ............ 10K Potentiometer
  
  
• Capacitors

• C1 ................. 2.2μF Ceramic/Polyester Capacitor
• C2 ................. 220pF Ceramic/Polyester Capacitor
• C3 ................. 47 Ceramic/Polyester Capacitor
• C4, C5 .......... 22μF / 65V Electrolytic Capacitor
• C6, C7, C8 .... 0.1uF Ceramic/Polyester Capacitor
• C9, C10 ......... 2.200uF / 65V Electrolytic Capacitor
• L1 .................. Inductor 5uH *Ver Texto
  
  
• Others
• P1, P2 ............ Screw Terminal Type 5mm 2-Pin Connector
• P3 .................. Screw Terminal Type 5mm 3-Pin Connector
• J1 ....................Set of male connectors 2-Pin (Optional)
• Other .............. PCB, Wires, Speaker, Heat Sink, etc.
  
  

Power Supply

Power is supplied through a 24 VAC transformer with center tape, i.e. [+VAC | GND | -VAC], after rectification the source will supply 35 VDC. 

It is a standard power supply voltage for this amplifier to work with little heating and little distortion, as it works with a minimum of 18V and a maximum of 84V. 

The current to power this amplifier is of at least 2A, and if it is going to using in stereo mode, two of these same ones, this current has to be doubled to 4 Amperes. 

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

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. 4 - PCB - High Performance 56W Audio Power Amplifier using LM3876 IC

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!!!