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.
We found this circuit in the February 1983 issue of Radio Electronics magazine. The 4-digit...
We found this circuit in an old American documentation. It is an electronic rheostat with a...
With this circuit it is possible to trace the characteristic curve of a component using an...