This circuit was found in a 1968 General Electric documentation. It has an input impedance of 2 M ohms and excites a load of 16 ohms. The integrated circuit of the time is the PA237.
This circuit is from a 2004 documentation, and can also be used to signal garages with the use of a...
August 2016 - Mouser Electronics is providing the ew converters step down LM53625-Q1 and...
The traditional circuit was taken from a French magazine Radio Plans that no longer exists but can...