This circuit for an optical audio link using LED or LASER was found in a 90s QST magazine. The circuit can use operational amplifiers like the 741.
This circuit was found in an old American manual. It is intended for testing SCRs and thermistors using...
This CMOS circuit is re-triggerable. It was found in the April 1988 issue of Radio Electronics...
The Exclusive-OR function is characterized by the truth table of the figure itself. We see then...