This circuit uses a resonant reed switch at the trigger frequency. The circuit is from General Electric in a 1966 documentation. This type of component is rare today.
We found this circuit in a 1967 American documentation. The diodes are general-purpose and the...
This circuit uses a pressure switch to turn a relay on or off. The supply must be 6 or 12 V...
The selected circuit was found in the Texas Instruments optoelectronics manual. RC and C1...