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60W Class A Power Amplifier Circuit

60W Class A Power Amplifier Circuit

60W Class A Power Amplifier Part List :

R1=47Kohm R31-32-35-36-39-40=0.22ohm 5W D1-2=15V 1.3W zener
R2-9-27-28=1Kohm R41=10ohm 3W Q1-3-8-9-10-15-18=MPSA06
R3-18=10Kohm R42=10ohm 1W Q2-4-5-6-7-19=MPSA56
R4=18Kohm R43=5.6Kohm Q11-13-14=MPSA93
R5-13=3.9Kohm R44=330Kohm Q12-16-17=2N6515
R6-12=560ohm TR1=22Kohm trimmer Q20-21-22=BD379
R7-8-19=2.7Kohm TR2=2.2Kohm trimmer Q23-24-25=MJ802
R10-20=120ohm C1=10uF 16V Q26-27-28=MJ4502
R11=12Kohm C2=1.5nF 100V MKT Q29-30-31=BD380
R14-21=680ohm 0.5W C3-9-10=100pF ceramic or Mylar L1= see text
R15-22-29-30-33-34-37-38=100ohm C4-5-6-7-8=100uF 25V F1-2=5A fuse fast
R16-17-23-24=220ohm C11-13=220uF 63V .
R25-26=22Kohm C12=220nF 250V MKT .

There is one amplifier configuration that is universally accepted as the ideal for audio use: Class A operation . Many early amplifiers operated in Class A, but as output powers rose above 10W the problems of heat dissipation and power supply design caused most manufacturers to turn to the simpler, more efficient Class B arrangements and to put up with the resulting drop in perceived output quality. Why Class A ? Because , when biased to class A, the transistors are always turned on, always ready to respond instantaneously to an input signal. Class B and Class AB output stages require a microsecond or more to turn on. The Class A operation permits cleaner operation under the high-current slewing conditions that occur when transient audio signal are fed difficult loads. His amplifier is basically simple, as can be seen from the block diagram.

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