RELAY - BASED CALCULATOR

This device will prove a valuable asset in teaching the principles of computing. Relays are easily understood visually, unlike the gnomic transistor. The machine will function at a low enough speed for its processes to be apparent, and LEDs will aid its transparency. I have already built a musical machine based on binary and sequential counting circuits successfully used as part of an interactive installation at Camden Arts Centre.

The machine also uses an innovative time - based serial method to perform calculations, unlike the parallel nature of faster conventional devices. This is negotiable based on individual requirements.

Below is a 'black box' diagram of the machine. Please see 'Space efficient binary converter' and 'Decimal to digital display' circuit diagrams on the Converters page for more detail on the individual elements. The binary elements of the device will be made up of identical binary counter circuits, interfaced with the keypad.

For basic logic gates and counters built using relays, please see further circuit diagrams.