Posted on May 2, 2012

The circuit is built around two power FETs, which are configured as a simple astable multivibrator to alternately switch the two lamps on and off. The rc values given sets the flash rate to about 1/3 Hz. By varying either the resistor or capacitor values, almost any flash rate can be obtained. Increase either Cl and C2, or Rl and R2, and the flash rate slows.

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

Decrease them and the rate increases.

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