This circuit was found in an Elektor from the 90s. The circuit uses common components even today, requiring a symmetrical power supply.
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...