This circuit provides a signal when dialing occurs. The circuit is powered by the telephone line voltage itself. We found it in an old documentation.
This three-transistor circuit was found in Radio Electronics magazine from May 1969. The circuit is...
A stereo digital mixer using the 4053 is built as shown in figure bellow. The IC must be powered...
The circuit shown is from a 1994 National Semiconductor documentation and can be implemented with...