Flasher CA3130 (CB22004E)

Found in an English documentation from 1977, this flasher or pulser circuit drives an LED. The frequency depends on C2.

Symmetrical 15 V power supply (CB8498E)
Found in na 1970 EDN this circuit has a parallel regulation providing a symmetrical output of 15 V....
Window Detector (CB16803E)
This configuration found in a 1976 publication can be elaborated with more modern operational...
Sound Intensity Meter (CB11533E)
This ultra-simple meter uses an output transformer and a small speaker as a microphone. The...