This circuit with germanium transistors is from 1960 and was found in Mullard's transistor application manual from 1960. The circuit can be adapted to use more modern transistors.
This circuit makes use of an optical coupler to isolate the telephone line. The circuit is from...
The LM109 is not a current integrated circuit, having been manufactured by many semiconductor...
The 4511 is a 7-segment latch driver providing up to 25 mA in each output. The typical application using the...