![]() ![]() Q6_MJ11016 120V 30A NPN Darlington Transistor R32,R33_R47 4W Wirewound ResistorsĬ1,C4,C5,C6_10♟ 63V Electrolytic CapacitorsĬ2_47♟ 63V Electrolytic CapacitorĬ3_47pF 63V Ceramic CapacitorĬ7_15nF 63V Polyester CapacitorĬ8_22nF 63V Polyester CapacitorĬ9_470nF 63V Polyester CapacitorĬ10,C11,C12_10♟ 63V Electrolytic CapacitorsĬ13_220♟ 63V Electrolytic CapacitorĬ14,C15,C17,C18_47♟ 63V Electrolytic CapacitorsĬ16_100♟ 25V Electrolytic CapacitorĬ19_33pF 63V Ceramic CapacitorĬ20_1000♟ 50V Electrolytic Capacitorĭ1,D2_BAT46 100V 150mA Schottky-barrier Diodes 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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