This circuit is from a 90s documentation. It has a hysteresis and uses a light sensing bridge. The circuit generates a 1000 Hz modulated 10 Hz signal. The signal must be applied to an amplifier.
This small MW transmitter emits its signals at a distance of a few tens of meters, depending on the...
We found this circuit in a documentation from the 50's. The transistors are germanium types. The...
This bistable touch sensor circuit uses a relay and is very sensitive. We found it in a 1990...