Flashlight circuit supplyed by battery

Published:2011/4/25 4:32:00 Author:Nicole | Keyword: flashlight, battery | From:SeekIC

This is a multivibrator circuit with same pulse duration time and interval time. The two transistors emitter of oscillatorare connected to the gate of SCR, the two lights is flashing alternatively controlled by SCR. Capacitance C2, C3, C4 should use bipolar electrolytic capacitor. The voltage on capacitance C2 is 12V, the polarity alternatively changes with flashing rhythm. The voltage on C3, C4 changes between -12V ~Uz, Uz is SCR trigger voltage, the total of transistor T2 or T3's base-emitter cut-off voltage and diode D2 or D1's forward voltage drop is about 3V. Changing the resistance R3, R4 can change the flashing frequency, in figure, the oscillation frequency is 80/min.



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