We found this circuit in a Poptronics from the 90's. Equivalent operational amplifiers can be used. The circuit must be supplied by a symmetrical source.
This 4-digit counter was found in a 1997 documentation. It uses CMOS integrated circuits and can...
This circuit provides a delay that depends on the components on the RC network. The formula for...
This circuit was found in an Electronics World of 1968. Its purpose in triggering a relay when the...