This circuit was found in a Radio Electronics from 1970. The coupler with LDR is from that time, but the circuit can be adapted to use modern components and act as a shield.
The presented circuit serves as a voltage reference for instrument adjustment. The diode used as a...
This circuit was found in a 1980s General Electric documentation. The circuit uses an operational of...
This circuit was found in a 1977 Radio Shack documentation. The circuit is TTL, which must be...