This circuit was found in Radio Electronics magazine from October 1964. The circuit uses two transistors of the time that require a supply voltage of 9 V. Consumption is 2.5 mA.
This circuit was found in documentation from the 90's. It is based on CMOS integrated circuits and can be...
This circuit is from an ancient American documentation. The integrated circuit is 741 and the...
This circuit was found in the June 1982 issue of Radio Electronics magazine. It provides reference...