This high-precision circuit was found in documentation from the 1990s. The integrated circuit is an LM111 or another in the series. The circuit has TTL output and can function as a shield.
This is the traditional configuration of a 5 V supply with the 7805 for a current of 1 A. The...
This circuit was found in an American 1980s documentation. The transistorized step is the...
This 90's project shows how to use an old cassette recorder to practice telegraphy. In position A of the...