Instructables

Step 2: Build the 555 ic one-shot timer

The timer that controls the effects is based on the good old 555 timer chip. I used the low-power CMOS version.

You can adjust the amount of time that the timer stays on by varying the values of the resistor to pin 7, and the capacitor to pin 6.

Time (seconds) = 1.1 x R x C

It is a good idea to set up the circuit on a breadboard to get the bugs worked out prior to soldering. However, in my experience, things can behave differently once they are reassembled onto a circuit board. I had to adjust my component values a little bit once i built the circuit on perf board.

Image courtesy of Rob Paisley.
 
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