This 555-based circuit was obtained from the 1995 Encyclopedia of Electronic Circuits volume 5. It triggers an SCR when the transistor is cut off.
This circuit eliminates mains noise from turntables or other audio sources. The circuit is from an...
) We found this circuit in a 1988 documentation, but it uses components that are still common...
This zener test circuit was found in an English publication from 1989. The circuit tests zener up to...