This circuit, which can serve as a reference for restorations, was found in the October 1989 issue of Radio Electronics magazine. The circuit uses a 5-digit display and a dedicated integrated circuit.
With a touch of the push button the lamp is switched on. A new touch and the lamp go out, in this...
The LMV321 is a low voltage operational amplifier from ON Semiconductor. The following diagram,...
We find this circuit in an old American documentation. It can provide a 25 dB compression in a...