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 the March 1994 issue of Electronics Now magazine. The circuit uses a...
Circuits similar to this appear elsewhere in this section. The transistors can be BC549 (low...
This VFO circuit generates signals from 2 Hz to 50 Hz. We found it in Popular Electronics from...