This circuit was found in an American magazine 73 for radio amateurs of the 80s. It is an automatic transmission circuit for telegraphy. The circuit is TTL.
This circuit has two high-impedance inputs. The gain is high and more inputs can be added. Use a...
This is a typical ohmmeter circuit with 50 uA analog instrument. The circuit was found in Radio...
Found in a Motorola manual from the 1960s, this circuit shows how to use a transistor in a static...