With the capacitor used, this circuit provides delays of 40 to 60 seconds. Larger capacitors can be used, and the SCR supports an equivalent. The circuit is from the 1977 RC semiconductor manual.
The CMOS 4046 integrated circuit is not very common today, consisting of a very efficient PLL for...
This circuit is from an English publication from 1979. It describes the assembly of a sensitive touch...
This simple optical alarm circuit was found in the 1991 Electronics Experimenter Handbook. The...