Found in a 1980s telecommunications documentation, the circuit presented acts as a product detector. The modulator or mixer in the square may be that of the previous circuit.
We found this circuit in a 1965 General Electric manual. The controlled load depends on the Triac...
This circuit has two programming positions which, with the capacitor employed allows intervals of 1 minute...
This circuit simulates the actual departure of a train as the speed increases slowly. The power...