This battery-powered micropower supply was shown in Radio Electronics magazine in 1991. The maximum current is 170 mA. and the integrated circuit is the MAX655 from Maxim.
This circuit is from a 1973 Argentine publication. Transistors no longer exist as well as the...
The traditional circuit was taken from a French magazine Radio Plans that no longer exists but can...
This second-order filter was found in old American documentation and can be applied to other...