This circuit was found in an Electronics Now from the 80's. The circuit is designed for 3-digit displays. The circuit is TTL.
The LM109 can be found with different origins. The circuit shown specifically is from Motorola's Linear...
In the figure we have an RS flip-flop made with two operational transconductance amplifiers. The circuit...
Using any general purpose or medium power transistor such as the BC558 or BD136 it is possible to light a...