This circuit is from an old American publication. It divides a 40 to 60 MHz TTL signal by integer values such as 2, 3 or 4. The circuit must be powered by 5 V.
This circuit was originally recommended to give the call signal on intercoms. However, it can be...
This circuit accurately monitors a 5 V TTL source. The circuit is from National Semiconductor's Linear...
This tunnel diode circuit was found in American documentation from 1966. The tunnel diode is the...