![]() Wait about 15 minutes, watch if the current is varying and readjust if necessary.Power-on the circuit and adjust R3 to read a current drawing of about 30 to 35mA.Set the volume control to the minimum and Trimmer R3 to its minimum resistance.To set quiescent current, tide ampare meter in series between supplay with this series, then do the following A better setting can be done using an oscilloscope, in order to obtain a symmetrical clipping of the output wave form at maximum output power R30 must be trimmed in order to measure about half the voltage supply across the positive lead of C7 and ground. Therefore a TO126-case transistor type was chosen for easy bolting on the heatsink, very close to the output pair ![]() ![]() In all cases where Darlington transistors are used as the output devices it is essential that the sensing transistor (Q2) should be in as close thermal contact with the output transistors as possible.
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