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.
Found in American documentation from the 90s, this circuit uses TTL technology and is therefore...
This protection circuit for battery chargers was found in an old Elektor. The relay is according to...
We found these circuits in a 90s Radio Electronics. In them, we have the way to turn a load on and...