This shield circuit with an optical coupler was found in an 90s EDN. The circuit can be used with voltages from 0 to 600 V with the indicated component values.
I found this circuit in a 1992 Electronics Experimenter Handbook. The circuit can be easily...
This egg timer has been found in an English magazine that no longer exists in 1982. The...
This comparator application circuit was obtained from the June 1986 Radio Electronics magazine. The...