In the figure we have the basic way of using the 3-and-a-half-digit counter 7107. The circuit is from an Electronics Now from November 1996. It uses two dual displays.
This circuit from an old Motorola manual uses an integrated circuit that is no longer easily...
This step was found in the 1960 Mullard transistor reference manual. The transistor can be a BC558...
This circuit is from the Philips Databook of 1990. The circuit has an input resistance of 60k ohms...