We found this circuit in a 1968 Electronics World. The transistors are from the era and information about the transformer was included. Transistors support current equivalents.
This circuit activates a relay when the conducting bars (probes) are held by a person. The circuit is...
Found in a 1968 Motorola documentation, this circuit operates at 1 kHz and can deliver 20 V from...
In this circuit of an American publication of 1978, the integrated circuit may be the 4001 and the...