High Power 600 Watt Quasi Amplifier Mosfet IRFP460

October 28, 2011 amplifier, circuit diagram, diy

High Power 600 Watt Quasi Amplifier Mosfet IRFP460 Circuit Diagram

Two versions of high-power MOSFET IRFP460 almost high Watt amplifier module is capable of a strong high POWW a longer period. The Actrk400 6 uses N-channel MOSFET output stage of the nearly 400 watts at 4 ohms to be delivered, while 12 Actrk600 n-channel MOSFETs used in the power amp to power over 600 watts at 4 ohms to deliver. A builder was close to 900 watts with the layout with 12 Actrk600 IRFP460 MOSFET.

Final configuration and customization. Not try to develop or test a power amplifier module that is not properly mounted on a heatsink. Make sure food is safe and the work area is clear. First, check all your work and ensure that the output devices are isolated from the heatsink. The structure is made without input or load to the amplifier.

Check the power supply is working properly, and check the rail voltages. Turn off power and check with a multimeter that the rail, the capacitors are discharged.

High Power 600 Watt Quasi Amplifier Mosfet IRFP460 PCB Layout

With a multimeter measure the resistance of VR2 and it has set for maximum strength.

Lead to land properly, which leads to two positive and the negative terminal of the amplifier module.

Remove the PCB and replace fuses with resistances of 100 ohms 5 watts. Connect a multimeter that the scale of 20 V on the resistance of 100 Ohm positive rail is set.

High Power 600 Watt Quasi Amplifier Mosfet IRFP460 Power Supply Schematic

Check if the power is properly connected for the last time and turn it on. If the meter goes off scale reading, and turn immediately to find the problem. Also check the resistance of 100 ohms 5 watts, you can go open cct.

When all set ok VR2 to adjust the output stage bias current by measuring the voltage across the resistance of the positive rail. Imagine for a reading of 4 volts per output pair FET. Namely, for a 6-FET board set for a voltage of 12 volts. This corresponds to a bias current of 40mA per pair, or FET total of 120 mA. For the FET board 12 attached to a voltage of 24 volts.

If everything is OK, check the output voltage offset and adjust VR1 to obtain an offset of less than 10 mV. You just have to wait between adjustments to offset liabilities.

If everything is off, away from the size-bias control (VR2) and replace the 100 ohm resistors with 10 ohm 1 watt resistors. Turn over and adjust VR2 to reach 0.4 volts per
FET pair.