This 80's Exar circuit has a carrier detector for frequencies up to 500 kHz. The circuit uses a company 567 which is still a common component.
This circuit was found in an ancient American documentation. The components of the time are not...
This circuit is from a 1977 technical documentation. Diodes D1 and D2 can be 1N34 or any other of...
This circuit controls two lamps so that when one increases in brightness the other decreases. The...