Following the American FCC rules, this 90s Radio Electronics circuit shows how to use a transformer to isolate the telephone line from an amplifier circuit.
The purpose of this circuit is used in communications and to respond to signals that are in the 2...
This circuit was suggested by Motorola in a 1980s publication. It is based on a PUT that is not a...
Found in American 90’s documentation, this circuit generates 300 Hz depending on the capacitors...