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.
Originally this circuit was designed to power tube transceiver equipment in the car, using a 12 V...
This adding amplifier with the operational LM324 is from the SGS integrated circuits manual of...
We have in the figure as a monostable a proximity switch where our body capacitance (estimated at 200...