Amplifier lamp adjustment circuit

Published:2011/4/7 21:01:00 Author:Nicole | Keyword: amplifier lamp, adjustment | From:SeekIC

When AC network is changing between 100V~140V, this circuit can provide 75W amplifier lamp or flood light with a 120V DC constant voltage. If it has not beyond the normal exposure time, then 150W is available. 500Ω potentiometer is used to adjust the lamp brightness. This circuit is series regulator, and it is a two-stage error amplifier composed of germanium PNP audio power transistor(should with radiator)and 12V zener diode used as reference voltage.



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