This General Electric circuit was found in a 1964 documentation. The circuit triggers a relay when the sensor is activated. Trigger adjustment is done in a trimpot.
This circuit was found in a 90s Popular Electronics. The frequency is determined by R3 and C1 that...
We found this circuit in an old documentation. It can be elaborated based on modern components. The...
This circuit was found in a Texas Instruments’ publication. The circuit must be powered from dual...