Posted on Aug 6, 2012

A unijunction transistor audio oscillator drives a small speaker. The oscillator`s frequency is determined by resistor R2 and capacitor C2. The ope rating voltage is supplied from the car`s turn-signal circuit(s) through Dl and D2.

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"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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