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 a 2005 Linear Technology manual. The resistor is calculated for the...
The frequency of this circuit is determined by the 100 uF capacitors. These components can be...
This circuit appeared in the July 1969 issue of Radio Electronics magazine. The sensor is an LDR....