Token Number Display

Numerical display systems are (unfortunately) very common in banks, shops and offices where they serve to manage a customer queue or waiting system. Commercially-made systems are very expensive because they are almost invariably microcontroller based. The circuit shown here is cost effective and relatively simple to make. The circuit employs BCD (binary coded decimal) thumbwheel switches are used to set any desired digit on the display. The switches are a cost-effective alternative to a microcontroller or a keypad.