Back to home page
Back to audio electronics page
Back to printed boards page
Such tools are available in electronic shops but you can also build your to your specific requirements.
Bottom: an aluminium sheet acts as a reflector and sends up UVs.
The UV light source: 4 UV tubes Philips TL 8W/05 not always easily available.
Right, tubes starters from mobile lights used car garage, there was a
promotional offer.
Down, (front plate), the electronic timer.
These came from hand-held lights used in car-repair officines. They were sold at 5$ each ...
And the schematic, if you can't find a promotional offer ...
Can be set to an exposure time range of 1-15' using the potentiometer.
A push button starts the exposure and another one can reset the exposure before
timer normal time.
Common exposure for the type of PCB I use is around 1'15".
Schematic comes from "Nouvelle Electronique - L'Incontournable N°5" December 2004.
Some mods were added:
Please, note the Start push button should resist to the maximal load's current during a short time.