This is the receiver for the previous circuit we found in the December 1992 Radio Electronics magazine. The sensor is a photodiode that must have optical features such as lenses.
The frequency of this oscillator depends on the crystal used. The transistors are general purpose. We...
You can measure capacitances across a large range of values using the AC Power line frequency as...
The circuit of the figure serves the same purpose as the previous one (CB5057E), but has a...