Fine Control Super Bright LED Pulser

Posted on Feb 5, 2014

Wanting to use two white LEDs, the second device must be wired across the Emitter of the transistor and negative ground with its own limiting resistor wired in series, like R15 and D3 in the circuit diagram. If common red, yellow or green LEDs are required, please wire two of them in series, in order to present roughly the same voltage drop of one

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white or blue LED. Please note that the unused sections in both ICs must have their inputs tied to negative ground whereas the outputs must be left open, as shown at the bottom of the diagram. All time-delays can be increased by changing the value of C3 and C4 to 47 µF 25V or even higher. Please vary the value of these capacitors only, as the values of the resistors wired to the four control pots are rather critical and should not be changed.

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