We found this circuit in the March 1999 issue of Electronics Now magazine. The indicator used is an analog type. The values indicated depend on the calibration.
This circuit came out in a publication called Electronics Handbook of 1993. The circuit shows how...
This oscillator can generate signals up to a few megahertz depending on the crystal used. Actually...
The drive levels of this shield are opposite to the previous one. The photo-transistor can be of...