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.
Found in a 1968 US publication, this circuit is designed to measure very weak signals. The...
This simple circuit is designed to charger AA or AAA Nicad batteries. Current can be changed...
This circuit was found in a 1980s US publication. There may be some difficulty in obtaining the...