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, which appears elsewhere on this website, was obtained from 1967 General Electric...
This circuit can be found elsewhere on this site as part of alarms or sirens. The circuit given is...
This circuit is intended for charging 12 V Nicad batteries, which corresponds to 10 common...