We found this circuit in Radio Electronics from the 90s. The components are current. The sensor is a common general-purpose transistor. The connection to the sensor is made by twisted pair.
This circuit prevents damage by accidentally reversing the power supply polarity. The circuit is...
The purpose of this circuit is to detect the movement of a person by the changes in light that...
This signal injector circuit, an astable multivibrator, was found in a 1971 magazine. The circuit can...