Project for Technical Aid for the Disabled.
Electronics by James Cameron
Case by another volunteer.
Side view, showing feet
Top view, cover open
Circuit board, showing connections
Schematic (AX2)(Note that this is before I learned how to use
Update, July 1999
The unit had been working flawlessly for over a year in a school in Sydney,
when one of the flourescent lamps failed and the protective fuse on the PCB
blew. Examination of the unit showed damage to the inverter transformer on
the lamp driving PCB (not my bit). The remainder of the design still works,
so the fuse protection was successful.
The volunteer (Barry Lees) doing the repair will be replacing the flourescent
lamp fittings with 21W incandescent lamps, with vents.