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 was found in the SGS manual of linear integrated circuits of 1982. The circuit...
We found this circuit in the National Semiconductor Linear Applications Handbook of 1994. The...
This simple strobe light is from an article in 1982. Its complete circuit, very simple, appears in the...