We found this circuit in the September 1992 issue of Radio Electronics magazine. It can be triggered by any signal above ½ Vcc, where Vcc is the supply voltage.
This circuit for automotive use was found in American documentation from the 90s. The circuit uses...
This circuit was found in Delco documentation from 1966. The components are from that time....
The CMOS TLC555 can be gated from external CMOS circuits using the configuration shown here. The...