We found this circuit in a documentation from the 90's. Information on the A/D converter was not given but types can be used according to the application.
We found this interesting timer circuit or CMOS timer in a 1988 publication. The circuit is still...
Found in RCA documentation from the 1970s, this circuit uses currently unusual integrated...
This circuit with 1% regulation aims at replacing mercury cells. We found it in a 1967...