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.
This circuit, from a 1997 documentation, is based on a pair of Motorola MC14026 dedicated...
We find this circuit in a 1978 documentation. The circuit uses two inverters of a 4049 integrated...
This circuit was found in a Motorola documentation from the 70s. The components are from the time,...