In the figure we have a 9V source using a 5V 7805 regulator. The circuit is from an American documentation from the 90s. The circuit has a 12V input. The maximum current is 1 A.
The amplifier shown in figure 2 is based on the MAX9715 integrated circuit from Maxim...
This stage for JFETs was found in a 1965 US publication, but is valid for modern components. |...
This circuit was found in a Japanese publication from 1971. The circuit uses components from the...