The circuit shown uses an operational amplifier that is uncommon nowadays. The circuit was obtained in a 1994 Linear Applications Handbook by National Semiconductor.
This circuit is a telephone line simulator and can be used for internal communications. It is...
This digital didactic digit counter uses common TTL integrated circuits and a common anode...
This reflectometer or standing-wave ratio meter (SWR) was found in a 1980s American documentation. The...