This circuit was obtained in an old Popular Electronics. It makes use of quite common components. The speed of the effect is set to R7. The circuit drives 20 LEDs.
We found this circuit in the October 1992 issue of Radio Electronics magazine. The duty cycle can...
This is a simple configuration for a low-pass filter using a 741 operational-amplifier. Other...
This circuit was found in a Hands On Electronics with the suggested application an optical link for...