![]() ![]() Rotate the cursor of R4 fully towards Q1 Collector.Connect the Power Supply Unit (previously tested separately) to the Power Amplifier but not the Preamp: the input of the Power Amplifier must be left open.The setup of this amplifier must be done carefully and with no haste:.Q3 = IRF9530 100V 12A P-Channel Hexfet Transistor (or MTP12P10) Q2 = IRF530 100V 14A N-Channel Hexfet Transistor (or MTP12N10) Q1 = BC550C 45V 100mA Low noise High gain NPN Transistor Finally, as the amplifier requires only a single rail supply, a very good dc voltage regulator capable of supplying more than 2 Amps 40V can be implemented with a few parts also.Ĭ2 = 47pF 63V Polystyrene or Ceramic Capacitor This is not a snag because it also helps in keeping noise and hum of the preamp to very low levels and guarantees a predictable output power into different load impedance. ![]() To obtain such a performance and to ensure overall stability of this very simple circuitry, a suitable regulated dc power supply is mandatory. The Power Amplifier section employs only three transistors and a handful of resistors and capacitors in a shunt feedback configuration but can deliver more than 18W into 8 Ohm with 0.08% THD 1KHz at the onset of clipping (0.04% 1W - 1KHz and 0.02% 1W - 10KHz) and up to 30W into a 4 Ohm load. This project was a sort of challenge: designing an audio amplifier capable of delivering a decent output power with a minimum parts count, without sacrificing quality. Including Preamp, Tone Controls, Reg dc Power Supply, 18 Watt into 8 Ohm - 30W into 4 Ohm loads ![]()
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