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 circuit uses the LT6106 from Linear Technology, from where we took it from a 2005 manual....
This is a conventional double T oscillator, where the frequency is determined by the double T...
This circuit uses one of the first comercial transistor and is from a 1958’s magazine. Tone...