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.
Other operational amplifiers series, such as the MC34072, MC34074, MC35071, MC35072, MC35074 d...
We can use this amplifier with low impedance headphones with good performance. Possible...
This circuit was found in the May 1989 issue of Radio Electronics magazine. The circuit requires a...