In the figure we have a simple 5 V power supply obtained from an American documentation from the 90's. The integrated circuit must be equipped with a heat radiator.
The purpose of this circuit is to keep the other phones on the same line muted when one is used....
This amplifier for signals in the 70 MHz band was found in an old English documentation. The...
August 2017 - Heat sinks for use with Arcol / Aluminum resistors can be obtained from Mouser...