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 an American documentation from 1954 and is indicated for use in toys with a...
In figure 1 we have an application for NLAS5113, a new device from On Semiconductor...
This circuit lets through the 300 Hz to 3kHz range that corresponds to the human voice. We found it...