We found this circuit in an old Mullard (Philips) documentation on the 555 and 556 integrated circuit (double 555). The relay must be 12 V with contacts that support the horn current.
G This neon lamp indicator was suggested by General Electric in 1970 documentation. Virtually any neon...
We found this circuit in a 90s Electronic Design. The circuit is based on a quadruple operational...
This circuit for photography uses was found in the Electronics Experimenter Handbook Special...