Operated directly from the power grid, this detector was found in an 80's RCA documentation. The sensor is an ionization chamber. The SCR triggers a warning siren.
This common crystal oscillator configuration was found in a 1980s American documentation. The...
This circuit was found in a Radio Electronics from May 1965. FETs are from the time, but the...
The integrated circuit used in this 70's application is not common today. The circuit consists of a small...