We found this circuit in an American 1980s documentation. The circuit uses a piezoelectric transducer unusual in our day. The transistor is general purpose type.
The purpose of this 1965 Radio Electronics circuit is to help observe cycloid waveforms on an...
This circuit was obtained from a 1976 NASA handbook. The circuit makes use of an operational of the...
In the figure we have the way to use a common LED as a light sensor. The operational power supply...