This high-sensitivity circuit was found in a 1980s documentation. The source can be a 9 V battery with a splitter to make it symmetrical. The shock can be 200 uH or more.
The drive levels of this shield are opposite to the previous one. The photo-transistor can be of...
In the figure we have a third fast adder that we found in an 80's Electronic Engineering. The circuit can...
With this circuit it is possible to receive the signals from the 11-meter band (27 MHz) in a...