This power step drains just 3.5 mA from the battery and can provide good playback on a 4-ohm speaker. The circuit is from an 80's documentation.
This 60’s commercial flash was found in the march 1961 Radio Electronics Magazine. The circuit uses...
This stage for JFETs was found in a 1965 US publication, but is valid for modern components. |...
Found in an Elektor from the 90s, this circuit must be powered by an isolated power source and also...