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 causes neon lamps to flash randomly from a low voltage supply (1.5 to 3 V). The...
This circuit is from a 1992 publication. The transistors can be the BC549 or BC548 and the power...
We found this circuit in an English publication from 1982. The transistors can be the BC548. We...