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Published:2009/7/6 3:33:00 Author:May | From:SeekIC
A unijunction transistor audio oscillator drives a small speaker. The oscillator's frequency is determined by resistor R2 and capacitor C2. The operating voltage is supplied from the car's turn-signal circuit(s) through D1 and D2. The diodes conduct current from the blinker circuit that is energized, and prevent stray current flow to the other blinker circuit.
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