This dual-gate FET RF signal mixer circuit was found in a 1980s documentation. The circuit is intended for applications in superheterodyne receivers of the time.
Found in old documentation, this circuit uses special discharge lamps (neon) of the time. The...
This 1968 Texas Instruments circuit uses diacs of the era. SCRs can be modern equivalents according...
This circuit is designed to measure very weak currents, in the order of picoamperes. We found it...