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# Class A 24 Watt Amplifier

2015-01-03 10:02
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This article briefly describes the Class A 24 Watt Amplifier. This principle is easy to understand, but also very practical. Depth understanding of circuit elements, can be more effective to grasp this principle. Do you know the circuit , for example, can understand and buy these components.

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). R23 is a trimmer and must be set to maximum resistance (10kOhm) when powering up. Then the resistance of R23 must be decreased until the the quiescent current is achieved. If the amplifier is mounted on a big enough heatsink ( 0.6K/W at most) then the amplifier is very safe from thermal runaway. Intelligence must be used when choosing power and voltage ratings of resistors and capacitors.

Circuit diagram:

#### Figure 1

*Specifications: *

24W Class A into 8 Ohm100mHz – 100kHz flat305mV input for 24W into 8 Ohm (33dB gain)THDis very low, although I have not been able to measure it properly