You'll probably get off cheaper picking up one of those 36W nail dryer boxes than buying all the parts. I bought one of these: http://www.ebay.com/itm/New-36W-110V-Nail-Art-UV-Salon-Gel-Curing-Tube-Light-Dryer-4-X-9W-Lamp-3-/180832116113?pt=LH_DefaultDomain_0&hash=item2a1a6f1d91#ht_4636wt_1301
Just take it apart and rebuild it. They were even nice enough to include some unpopulated pads on the PCB that you can use to solder in a pot and some resistors to make the timed mode variable. The timer is nothing but a simple 555.
If you're making small breakout boards you can just mod it so that the timed mode is variable and slide your board right in. The picture frame i was using to hold the mask down to the board didn't quite fit, so i took a dremel and widened the opening. I also didn't like that the bulbs aren't all on the same plane, so i cut the two on the edges out, made some new holes and superglued them back in. I found when exposing boards inside the nail dryer that it works quite quickly. I only needed to expose for about 43 seconds.
Just take it apart and rebuild it. They were even nice enough to include some unpopulated pads on the PCB that you can use to solder in a pot and some resistors to make the timed mode variable. The timer is nothing but a simple 555.
If you're making small breakout boards you can just mod it so that the timed mode is variable and slide your board right in. The picture frame i was using to hold the mask down to the board didn't quite fit, so i took a dremel and widened the opening. I also didn't like that the bulbs aren't all on the same plane, so i cut the two on the edges out, made some new holes and superglued them back in. I found when exposing boards inside the nail dryer that it works quite quickly. I only needed to expose for about 43 seconds.
--- In Homebrew_PCBs@yahoogroups.com, "Mario Mikulandra" <mmaudioelectronics@...> wrote:
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> Yep, nail polish tubes will do the job. Not actually designed for photo chemical process but they are fine.
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> Btw, what the heck is wrong with the messaging system? There is an annoying lag!? :-|
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