This simple 6 V source stabilized by zener diode was found in a European technical publication from 1972, but it is current for its simplicity and the components it uses.
Indicated at the time of publication as a “walk man” for MW radios, this circuit is simple and can...
This amplifier can be powered with voltages from 9 to 14 V providing 7W of maximum power under a 8 ohms...
This circuit indicates when a rain is acidic by monitoring its pH. The circuit is from a 90s RE...