The indicated circuit uses an unusual buffer from National Semiconductor. The frequency is given by resistors R1 and R2 as well as capacitors C1 and C2.
This circuit consists of a test oscillator for medium and high power NPN transistors. For PNP,...
This is a complete version of the previous circuit, with several scales and two transistors, one...
Found in a 1965 Electronic Design, this circuit makes it possible to select signals with an...