This circuit was obtained from a Radio Electronics in February 1965. The circuit uses two transistors from the time and can be created with modern equivalent transistors.
The presented circuit monitors a line indicating if it is busy if there is an extension. The...
July 2017 - The Texas Instruments step-down converter module of the same name IC can now be...
This circuit uses the LT6106 from Linear Technology, from where we took it from a 2005 manual....