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.
This circuit from the 90s, was found in an Electronic Design of the time. The components used are...
This circuit was found in an English technical documentation from 1973. The circuit generates...
The selected circuit was obtained in a Texas Instruments opto-electronics manual. The transistors can be...