We found this circuit in the 1964 RCA transistors manual. The transistors used are uncommon today, but they can be used equivalent. The circuit controls the operation of a heating element.
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...