This additional bell circuit was found in the February 1994 Electronics Now magazine. The transistors are common, and the circuit is for analog lines.
The input of this regulator can be between 7 and 12 V and the output is 5 V. The circuit is from...
This circuit uses common components at the time of its publication in the 1980s. The circuit can be...
August 2016 –It can be purchased from Mouser Electronics the new converters BD7F100 and BD7F200...