This 6W amplifier with 4 tubes was indicated in an American documentation from 1947 to operate with recorders. The circuit uses a source with a transformer.
This circuit can be used to activate the lamp when it gets dark. We found the circuit in old...
Found in Motorola documentation from the 1980s, this circuit employs an integrated device from...
This circuit generates slow interval steps for controlling stepper motors. The circuit has two...