Found in a 1980s English magazine, this trigger circuit can have different types of inputs depending on the sensor and type of action on the controlled load.
This circuit is from a 1995 technical documentation. The transistor can be a BC558 and the sensor...
Found in a Popular Electronics from the 90s, this circuit checks the presence of voltage on a...
The critical component of this amplifier is the output transformer. We found the circuit in an old...