This high sensitivity sensor was found in a 1967 General Electric SCR manual. The circuit admits equivalents by triggering a load according to the used SCR.
This circuit produces a pulsating intermittent sound in frequency that can be adjusted in P1. The...
We found this circuit in a Popular Electronics from the 90's. The circuit activates an oscillator...
This crystal-controlled oscillator was obtained from an American 1980s documentation. The circuit...