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.
Found in a 1970’s documentation, this circuit uses components of the time, uncommon today. |...
This simple robot circuit was found in a Radio Electronics from the 90s. The components are...
This very high input impedance preamplifier is from a publication of 1977 but can also be mounted...