Stereo Amplifier Of 500 Watts Quasi Complementary Stereo Amplifier Of 500 Watts Quasi Complementary The output transistors MJL21194 are of great power and performance. They must be very well adjusted with through screws, washers and nuts and properly insulated from the heatsink with mica insulators. Remember to use silicone grease and tighten the screws very well, so that the heat is transmitted from the transistors to the heatsink. After screwing them to the heatsink, verify that they have been isolated from the heatsink. This is done by placing the multimeter in continuity and place one end of the multimeter in the sink and the other in the transistor collector, which is the pin or terminal of the center. You should not mark anything or infinity (a 1 on the left). NOTE: The original power transistors are low gain. Therefore, if you use transistor MJL21194, you must have a maximum hFE or gain of 40. If you do not get these transistors you can use the 2SC5200, but you should also lower the transformer voltage to 45x45VAC. So the maximum that will be achieved is a power of 400W.

TDA1524 Preamp Tone Control Circuit Preamp circuit is TDA1524 from the company Philips. His involvement This circuit can with a minimum of external components to change the volume, balance, treble and bass. Its advantage is that all settings adjustment is performed by changing the voltage on the corresponding pins of the circuit and that for both channels at the same time.