Found in an EDN from the 1980s, this circuit uses a double 555. The circuit activates a relay that controls a horn or siren. Next to the diagram we have the timings.
This one-digit photometer using CMOS circuits was found in a 1989 documentation. The circuit is...
The presented circuit generates signals in a 1:10 frequency range depending on the Ct capacitor. See the...
This circuit, from a 1988 publication, consists of a timer that activates a relay at the end of a...