This circuit was obtained in a 1970 engineering documentation. The operational is the 741, but other operational ones can be used. The power supply must be symmetrical.
We found this circuit in an Australian publication from 1991. It is a kit of the time with input...
This time base circuit was found in the January 1988 issue of Radio Electronics magazine. The...
This circuit was found in the December 1983 issue of Radio Electronics magazine. The sensor is an...