We found this circuit in a Popular Electronics of the 90s. The circuit can be easily mounted today, as the components are common. The SCR can be the TIC106.
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...