No information is given on the transformer in this circuit that we found in an American 1967 documentation. The power transistors are of the time and mounted on a plug-in module.
The division by eight using the 4018 is made as shown here. It isn't necessary to use additional...
This simple alarm with latching uses a relay as the main element. The circuit is from a Radio...
This circuit uses an operational amplifier to simulate an inductor. The circuit is from old...