Flashing Led Controller

Posted on Apr 19, 2012

The LED with integrated flasher is connected in series with the base-emitter junction of transistor Tl. Thus, the l

Flashing Led Controller
Click here to download the full size of the above Circuit.

oad connected to K2 is switched on and off in rhythm with the flash rate. This load can be a relay or a lamp. The maximum collector current of the transistor (of the BD139 = 750 mA) must not be exceeded. If that is not sufficient, a power Darlington can be used, which will give some amperes. The current drawn by the circuit under no-load conditions amounts to 20 mA.

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