This circuit allows you to simulate an analog telephone line for the repair and testing of devices. The circuit is from 1994 and all the components used are common.
This circuit was found in an American documentation from the 90's. The operational amplifier is the...
This detector circuit was found in documentation from the 1980s. The diode is a high frequency detector...
For those who like electronic games, have good experience in the design of printed circuit boards...