This circuit uses a 555 (according to the diagram) to generate 50 ms tone bursts at a frequency of 1.5 kHz. The circuit is from an 80's Electronic Design.
This circuit is from a 1967 publication. The configuration holds true for modern transistors having...
This circuit provides a signal when dialing occurs. The circuit is powered by the telephone line...
The circuit shown is a Step-Down converter that can provide a 5 A output with 4 to 18 V inputs. The...