This circuit is from an Electronics World of 1968. The transistors are of the time and the power is supplied with a voltage of 40 V. The circuit is high fidelity.
This automation control circuit uses two relays to control 4 loads using just one switch. The...
This circuit is used to test an inductor (coil) allowing the observation of its opration in an R-L...
This circuit found in a 1965 Electronic Design multiplies the frequency of a 400 Hz signal...