Using the BC549 to steal any excess base current from the compound pair. The base-emitter voltage of the BC549 determines the current. X 1 Ohm 1W resistors in parallel), but some experimentation may be needed here, since The 0.25 Ohm resistor should cause little grief (4 The current sink shown should have very high linearity, since it is based on the sameĬoncept as the output stage devices. Heatsink - this amp will run hot.l.)Rangkaian 20 Watt Class-A Power Amplifier Using +/-20 Volt supplies - either conventional, regulated or using a capacitance multiplier, it should actually be capable of about 22 W before clipping, but expect to use a big With simulations, everything appears to be as expected, but although I have yet toĪctually build it and test it out thoroughly, no-one has had any problems so far. Several readers, and the reports I have received have been very positive. He amplifier circuit uses the basic circuitry of the 70W power amplifier, but modifiedįor true Class-A operation - it should be pretty nice! This amp has been built by
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