This power supply was found in a RCA publication from the 1970s. The circuit uses transistors from that time. Modern equivalent transistors can be used.
This telegraphy circuit generates an audio tone from a pure RF carrier. We found it in a...
The idea of this circuit is a resistance meter or continuity test with a common microammeter or...
This low-pass filter with 741 op and symmetrical source was found in the August 1993 issue of...