Based on NXP 74HC logic, this circuit can be adapted for various uses. The circuit can also be used with 12V power, and the circuit replaced with a common 4046 PLL.
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...