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.
The diodes of this circuit are general-purpose, and the base resistors are typically between 2k2...
This circuit was found in the February 1981 issue of Radio Electronics magazine. The circuit uses...
The operational amplifier used in this circuit is no longer very common, but the configuration can be adapted...