This circuit was obtained in a 1999 English magazine. We can easily assemble it with a BD136 or even TIP32 transistor and its supply can be made with voltages from 9 to 12 V.
This oscillator takes advantage of the 2000 ohms headphone inductance as the oscillator circuit coil....
This circuit was found in an 80's Electronic Engineering. The circuit uses a multivibrator with...
Found in a 90s Radio Electronics, this circuit is intended to trigger a relay when the current in...