Found in 90's Electronic Engineering this circuit can be used to measure phase angles between two signals from 0 to 180 degrees. The components used admit modern equivalents.
Figure bellow shows how the flip-flops of a 4027 can be connected to perform a divide-by-5 counter [odd...
This circuit is interleaved with the source of a portable AM or FM radio previously tuned to a...
This control allows to start or stop a motor up to 3 or 4 A with a low intensity signal. The...