Search found 11 matches

by Ytierian
Fri Aug 31, 2007 2:37 pm
Forum: Construction
Topic: Homemade, inexpensive vacuum chamber for degassing
Replies: 9
Views: 7155

Homemade, inexpensive vacuum chamber for degassing

I went and built a Vacuum Chamber for degassing small amounts of either RTV or Resin

I've also taken pictures and posted on my site a quickie instruction set for building your own

http://www.citlink.net/~ytier/Vacuum%20Chamber.htm

Have fun

Ytierian
by Ytierian
Wed Aug 15, 2007 5:03 pm
Forum: Lighting & Electronics
Topic: Shave an LED
Replies: 9
Views: 8373

Yes, they have LED's as small as 1.8mm; just over 1/3 the diameter of a 5mm.

Check out http://www.unique-leds.com/index.php for a full listing

Ytierian
by Ytierian
Sat Aug 04, 2007 8:22 pm
Forum: Construction
Topic: Problems with resin casting
Replies: 32
Views: 20892

>If the resin DOES NOT cure, it is a bad batch. Well, there was some left in my mix-pour cup that I left on the work table.... it's been 54 hours now and even THAT is still gooey. I've given up on the Alumilite - I can't even find specs on it anywhere - ordered some Smooth On.... we'll see how that ...
by Ytierian
Fri Aug 03, 2007 8:08 pm
Forum: Construction
Topic: Problems with resin casting
Replies: 32
Views: 20892

>Are you covering up the mold opening? I understand this can cause problems by not letting heat escape. Condesation or something happens that doesn't let it cure completely. Nope, leaving the pour and overflow holes open for expansion and bubble release (if needed) >Also it is possible you might hav...
by Ytierian
Fri Aug 03, 2007 7:11 pm
Forum: Construction
Topic: Problems with resin casting
Replies: 32
Views: 20892

Yes, I'm using their RTV with release, and I'm warming the mold in a 130 oven for 10 minutes

Problem is, it NEVER hardens..... the second cast is still down there, flowing all over the scrap cardboard I put it on.
by Ytierian
Fri Aug 03, 2007 5:16 pm
Forum: Construction
Topic: Problems with resin casting
Replies: 32
Views: 20892

Problems with resin casting

Ok, I'm trying to cast my own Bussard Domes for the AMT-E I'm using Alumilite Water Clear. Here's my problem; this is with new cans of resin and catalyst. 1st cast, adding transparent red dye; mix 50/50 by weight (yes, I have a gram scale) according to instructions; mold is pre-heated; pour went fin...
by Ytierian
Sun Jul 22, 2007 7:23 pm
Forum: Lighting & Electronics
Topic: Where to order components online?
Replies: 32
Views: 123177

Ok, I've been doing some ordering and here's my "results" Jameco - fast order processing, fast shipping; even the ground service to me took only 3 days - IC's, resistors, caps, boards, wire, misc. Unique LED's (http://www.unique-leds.com/index.php) - probably the best place I've seen. They...
by Ytierian
Sat Jul 07, 2007 2:54 pm
Forum: Lighting & Electronics
Topic: Rotating Bussard Collectors
Replies: 5
Views: 5981

Re: Rotating Bussard Collectors

?I need to create exactly what the title says....how do I do it? >I have experience with circuit boards and LED's but i need a bit of help for this one. I've actually designed something already for this. 555 timer circuit for blink rate feeds into 4017 Decade counter - jumping pin 5 to 15 (3 outputs...
by Ytierian
Fri Jul 06, 2007 9:48 pm
Forum: Lighting & Electronics
Topic: Fade to dim
Replies: 7
Views: 5620

Re: Fading circuit

>>The pulse width modulator that is in the sticky thread can also be adjusted to do this. You can adjust the level that the triangle wave is swinging between and adjust the bias. In your case you want the bias very low, and the swing very small. - Sparky > Thanks, I'll check that out and see where i...
by Ytierian
Wed Jul 04, 2007 5:27 am
Forum: Lighting & Electronics
Topic: Fade to dim
Replies: 7
Views: 5620

Fading circuit

>>I would use a single-chip computer, which could do this easily. And the cost would be comparable to the circuit on the webpage. Of course the people who know of me are really surprised ... - jwrjr And of course, though I've programmed anything from a C-64 to an AS-400, I have NO idea how to progra...
by Ytierian
Tue Jul 03, 2007 8:36 pm
Forum: Lighting & Electronics
Topic: Fade to dim
Replies: 7
Views: 5620

Fade to dim

I'm looking to install a pulser circuit in a model I'll be starting soon. Thing is, I don't want the standard - start at black, fade to full, fade to black. What I want is a low-level glow at it's minimum, fade to full, fade back to the base low-level. Can I adapt a circuit like this one http://www....