This TTL sequential flasher circuit was found in the January 1981 issue of Radio Electronics magazine. It is powered by 5 V. The frequency can be adjusted by R1.
This source, from a 1982 documentation, uses a triac to control the power and voltage applied to...
This circuit was found in Motorola documentation from 1968, using high power transistors and...
This circuit was found in documentation from the 1980s. The circuit uses several components of the...