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.
We found this simple frequency meter for low frequencies in an English publication from 1978. The...
September 2017 - Texas Instruments TPS543C20 Step-Down Converters can be found on Mouser...
We found this circuit in a Radio Electronics magazine from June 1992. The circuit has a power...