Suggested for the control of photographic enlargers, this 1967 General Electric circuit uses still common components. The circuit directly controls a lamp for exposing negatives.
This circuit was found in a factory manual from the 1980s. It can serve as the basis for an...
ON Semiconductor NTMJS1D5N04C 40V Industrial MOSFET Available from Mouser Electronics, these ON...
This circuit uses bipolar transistors and unijunction transistors to generate a linear ramp in...