This 4-voltage power supply using zener diodes has a maximum recommended current of 25 mA. The circuit was found in the May 1966 Radio Electronics magazine.
This circuit is a kind of Hertz Loop that can be used to check the operation of transmitters and...
This high-impedance headphone circuit was found in a 1990s William Sheets. The power is low, but...
Based on the 555, this circuit was obtained from Internet documentation, serving to generate a...