This circuit can be used to test crystals from 1 to 20 MHz and also has an output to measure their frequency. We found it in the November 1998 Electronics Now magazine.
Published with a power amplifier in the January 1985 issue of Radio Electronics, this circuit...
This circuit with 3.3 MΩ input impedance was found in the October 1993 issue of Electronics Now...
We found this transmitter in a Popular Electronics from 1992. The circuit transmits in the range of...