Employing the XR2206 IC, this circuit was found in the May 1977 issue of Radio Electronics magazine. The formula next to the diagram gives the component values as a function of frequency.
We found this circuit in a 1980 documentation. With basic changes, including transistors that were...
This circuit was found in a Radio Electronics from July 1963. The diodes and transistor are...
We found this circuit in a 2002 documentation. The circuit is an emergency lighting system with an...