Based on the LF256 operational amplifier, this circuit was found in the September 1989 issue of Radio Electronics magazine. The indicator is analog, and the power supply must be symmetrical.
We found this circuit in a 90's Popular Electronics. The circuit produces a loud sound if S2 is...
The circuit shown was obtained from a 1976s publication for radio amateurs. Its purpose is to...
The model aircraft spark plug filaments operate with a low voltage of the order of 1.5 V. This...