Found in the August 1994 issue of Electronics Now, this CMOS circuit uses the 4046, which is uncommon today.
When a pulse of light reaches the sensor [a CDs cell or LDR] the flip-flop changes its state....
Found in a 1958’s publication, this receiver uses components that are nbot easy to find in our...
This circuit is used to test an inductor (coil) allowing the observation of its opration in an R-L...