This simple circuit was found in a Japanese magazine in 1967. The circuit is listening on a headset and the coil is 50 + 50 turns of wire 28 or thinner on a ferrite rod.
This circuit was obtained in the Motorola Linear Interface ICs of 1993. The current is determined by the...
This circuit with two power transistors was found in Radio Electronics magazine from October 1960....
This simple electronic toy organ produces an interesting sound, which can be used by the most...