This stage for JFETs was found in a 1965 US publication, but is valid for modern components.
In the figure we have a simple timer with two voltage comparators of the four of an LM339. The...
This circuit can be used in a signal level indicator with LEDs. The circuit is from an Electronics Now...
This circuit, found in an old magazine of the year 1968, uses a Power germanium transistor. This...