This decorative circuit was found in the July 1994 issue of Electronics Now magazine. It makes LEDs blink in a face-shaped allegory. The frequencies are given by the capacitors in the oscillators.
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...