The supply used transformer with 20A/45Ct and at leastĤx10000uf/80 volt capasitor. Or you can order it at the store PCB audio kit in the center of electronic singosaren oriental, solo.the assemble cables for DC power supply and output transistors must be large, use sizeġ.5-3mm for large current passed.
Currently I do not have a picture to the circuit board, but because the amplifier circuit is quite simple, you can design it His is a scheme set 1000watt power amplifier. The output DC offset to within a few mV of zero. The nominal value is around 400 ohms, but making it variable allows you to set
Voltage across the 0.25 Ohm resistor exceeds 0.65V, the transistor turns on and achievesīalance virtually instantly.The 1k trimpot in the collector of the first LTP transistor allows the DC offset to beĪdjusted. 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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