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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 Cascode 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 Cascode, as already explained, and deliver to 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, 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 - 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.

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My Best Regards!!!


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