The component used in this circuit is uncommon today. The circuit is from Motorola's 1990 Linear Databook.
The circuit shown in figure 1 uses the ST8R00 from ST Microelectronics which consists of a 1 A...
We found this circuit in an old American documentation. Transistors can be modern equivalents. ...
This BFO or OFB for listening to SSB (Single Sideband) signals was found in the January 1996 issue...