This high power audio amplifier circuit consists of a differential amplifier as first stage amplifier. Potentiometer VR1 is used to adjust the offset voltage of the amplifier before entering the next level.
Transistors Q7 and Q8 on this amplifier circuit serves as protection against short circuit, which flows out through the final stage transistor will be limited to about 12 Ampere. The feedback component from R6A and C3a shown in the figure dashed are optional.
Diode components D9 and D10 will protect the transistor from amplifier back-EMF working on resistive load. IN5404 diodes capable of withstanding peak currents up to 200A, which should reach the minimum voltage is 400volt.
100ohm resistor VR1 valuable functions to balance the strengthening of DC, which offset voltage must be within the range of +/- 25mV. Resistor VR2 is used to adjust the bias current. At the time of amplifier circuit stanby, measure voltage contained in the R19 or R20 resistors and set at 150mV.
This high power audio amplifier circuit designed for high power amplification to provide peak power 2kW and 1,5kW continuously, so that this amplifier can drive your big speakers with fantastic. With 8ohm loudspeaker, amplifier can produce 1500W power. Don’t use small speakers to try this amplifier circuit because the amplifier will be damaged by it.
As a final level amplifier, been usual bipolar transistor instead of using MOSFET as a bipolar transistor to a particular case is more resistant than the high voltage MOSFET. Transistor type used herein are the type MJ150004 / 5 or MJ21193 / 4 which dirangkaian in parallel to generate high power.
The transformer digunakana on this amplifier circuit is 2x90VAC, which once into DC voltage would be +/- 130VDC at no load. Because the supply voltage is high, please be careful in assembling it to avoid a fatal mistake.
This project describes an high power audio amplifier, power supply and test procedures, which are very dangerous due to high voltage.This article does not even need to consider if you are not completely confident in your knowledge and actions. You know – you take the full 100% responsibility for what you do. There are aspects of development that may require review and adjustment.
Continuing reading this article, you implicitly agree that you are solely responsible for all the possible physical and material losses associated with the construction of this amp.