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 was found in a 1977 Signetics manual. The 556 consists of a 555 double and the...
One of the first transistor amplifiers with transformerless output but using a 45-ohm speaker. This...
With this simple converter found in a 1997 documentation, it is possible to tune VHF stations to a...