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.

Click here to download the full size of the above Circuit.

"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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