Found in a 70s RCA manual, this circuit uses transistors from the era. Equivalent types can be used such as TIP31 for Q1 and BD135 for Q2.
This circuit was found in a 1980s documentation. It decodes by identifying a certain frequency tone...
The purpose of this 2000 documentation circuit is to decode SSB (BLU) signals to be audible on...
This circuit was found in Electronics Handbook, Vol XIII 1993 and consists of a simple direction...