This timer circuit was found in a 1980s American documentation. Transistors and SCR support modern equivalents. The circuit was originally designed to control a motor.
We found this relaxation oscillator in a 1967 General Electric documentation. The frequency is given...
This circuit generates a 20 MHz sinusoidal signal from a 10 MHz crystal. It is found in the 1992...
This circuit is from a 1967 publication. The potentiometer above 4M7 is the critical component. The...