The circuit is from 1980s Linear Technology documentation. The components are of the time and circuit behavior curve is given along the diagram.
The project is from a 1992 publication, but totally current by the components it uses. The LEDs...
This circuit was found in Radio Electronics from the 90s. The transistor is for general use. The...
This circuit is suitable for testing motor starting capacitors. Capacitors from 2 to 8 uF are...