Indicated for adjustment in transmitters for the 11-meter band, this circuit with analog meter was found in the Radio Electronics magazine of January 1978. The circuit does not use a power supply.
This circuit, from a 1973 documentation, can be made with BC549 transistors. The frequency depends on...
The transistors in this 80's documentation project may be BC548, the most modern equivalents of...
This circuit was described in an article in the February 1993 Radio Electronics magazine. The...