EtchingBox: Difference between revisions
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=Components= | |||
=Power Supply== | |||
should be able to provide at least 2 x 2 Amps for heating, 1 Amp for lights and a bit more for micro controller, displays and stuff | should be able to provide at least 2 x 2 Amps for heating, 1 Amp for lights and a bit more for micro controller, displays and stuff | ||
so at least 12V / 6-8 A, 72W - 100W | so at least 12V / 6-8 A, 72W - 100W | ||
Revision as of 16:52, 3 May 2014
Components
Power Supply=
should be able to provide at least 2 x 2 Amps for heating, 1 Amp for lights and a bit more for micro controller, displays and stuff so at least 12V / 6-8 A, 72W - 100W
Master Controller
Gnusbuino based?
UV Exposure unit
Slot loading, double-sided UV exposure: put PCB and overhead slide between two glass plates. The mechanism presses glass plates together. Exposure starts when assembly is fully inserted. You can stop exposure anytime by retracting the assembly. Otherwise it will stop at a predefines time interval.
First tryouts with UV fluorescent lamps seemed promising - you can get DULUX S style UV lamps for nail polish hardening on ebay for about 2.50 Euro. But two bulbs, 8cm apart, 6cm distance from PCB don't give an even enough light to expose a full 160x100mm PCB - 3 minutes exposure seems to overexpose the center while the corners still don't get enough light. You can put 2 Dulux S on one ballast, so adding a third lamp per side means 3 ballasts if I want to stick with double sided exposure.
UV LEDs?
LEDs would be much easier to control, they are low voltage DC, safer to operate in a potentially humid environment. You could put plenty of leds dispersed on a eurocard size PCB and achieve a much more even lighting. Just found and ordered these suckers: