Please select the links (
on the right to
see details of how some parts of the display were constructed.
The light display is controlled by a computer, it plays the music that the lights are synchronized to, and turns all the lights on or off when required.
The computer is connected to an interface which enables the data from the parallel port of the computer to be decoded into the output channels, these are further connected to opto-isolators so that the mains voltage (230v) is separated from the interface and computer to keep things safe.
supply to the lights is also protected by Residual Current Devices
(RCD's) or Earth Trips as they used to be known, so that if a fault
occurs the power goes off. - Nice and safe.
The outputs are split in to two groups of channels, 192 + 12. The 192
channels is made up from 12
IC's with 16 outputs and drives the main display. The additional 12 outputs
derived from a second parallel port used to drive the Moving
message Display with 7 channels for the data rows, one for the clock pulse and
Opto-isolators & RCD's
Baked Beans & Bulbs