Here the schematic diagram of 60 watts power audio amplifier. The main components is a pair of power transistor 2N3055.
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15 Watt Audio Amplifier
Circuit Description:
This amplifier uses a dual 20 Volt power supply and delivers 15 watts RMS into an 8 ohm load. Q1 operates in common emitter, the input signal being passed to the bias chain consisting of Q8, Q9, D6, D13 and D14. Q8 and Q9 provide a constant current through the bias chain to minimize distortion, the output stage formed by a discrete darlington pair (Q2,Q4) and (Q7,Q11). The last two transistors are power transitors, specifically the 2N3055 and MJ2955. The 7.02K resistor, R16 was made using a series combination of a 4.7K, 680 Ohms, and two 820 Ohms. The 1.1K resistor, R3 was made using a 100 Ohms and a 1K resistor. You can use this circuit with any walkman or CD player since it is designed to take a standard 500mv RMS signal.
24W Class A Audio Amplifier
Here the Class A Amplifier with below specification:
- 24W Class A into 8 Ohm
- 100mHz – 100kHz flat
- 305mV input for 24W into 8 Ohm (33dB gain)
- THD is very low, although I have not been able to measure it properly
The supply voltage can be between 34V and 46V and the quiescent current should be set to 1.7A measured through R25 (a voltage of 0.75V must be measured over R25 for a quiescent current of just under 1.7A).
