This circuit was obtained in an old Elektor and can be adapted to use white power LEDs. The transistor must be equipped with a heat sink. The circuit has a battery charger.
This simple guitar distortion effect was found in a documentation from the 90's. The circuit is...
Found in a Popular Electronics from the 90s, this game can be seen in other configurations on this site. The...
This crystal fundamental frequency oscillator can operate at frequencies up to a few tens of...