This circuit is intended for use with motors, lamps,heatings etc. Continuously from nearly zero up to maximum capacity (5-95%). Almost lossfree control by means of this impulse control. Nearly total turning moment of motors. The transistior T3 must absolutely be fastened on a heatsink with minimum dimentions of approximate 100x100x5mm. The heatsink has to be fixed insulated as the transistor has a conductive connection between the C-connection and the metal rear side.
The transistor T3 can be destroyed by short circuit or by overheating if the circuit is operated without heatsink.