This circuit for multiple sound inputs was found in a Radio Electronics from January 1992. It consists of a Bargraph connected to a multi-input mixer.
This circuit is from a 1980s documentation featuring two time constants for sound decoding. The...
This circuit was obtained from the 2005 manual of Linear Technology LT1306. The formulas for...
This circuit can switch signals in the 3.5 to 30 MHz band. We found it in a QST magazine from the...