Search found 496 matches

by MillenniumFalsehood
Sun Aug 27, 2017 12:28 am
Forum: Lighting & Electronics
Topic: Why is my 555 timer not blinking?
Replies: 30
Views: 1189

Re: Why is my 555 timer not blinking?

I'd also like to remind everyone how easy this is with a Microcontroller like Arduino: You can set those two values however you like. There's no restriction on the duty cycle as there is with a 555, and you don't need to rewire your circuit if you change your mind about the flash rate or duty cycle...
by MillenniumFalsehood
Wed Aug 23, 2017 5:51 pm
Forum: Lighting & Electronics
Topic: Why is my 555 timer not blinking?
Replies: 30
Views: 1189

Re: Why is my 555 timer not blinking?

Hmm... a new problem seems to have emerged. I thought I could simply put a diode across R2 and that would cause it to strobe rather than have a >50% duty cycle. Well, none of the diodes I've tried have worked. I used a 1N4004 and a 1N485A, plus a couple more that I found in the parts bin. It still h...
by MillenniumFalsehood
Tue Aug 22, 2017 5:41 pm
Forum: Lighting & Electronics
Topic: Why is my 555 timer not blinking?
Replies: 30
Views: 1189

Re: Why is my 555 timer not blinking?

I think you miscalculated your RC time and you have an LED blinking at too fast a rate for the eye to detect. I think your off blink time is about 10 msec. I suggest increasing your resistor and or capacitor values to get a longer RC time. Turns out you were right! I had been calculating it on the ...
by MillenniumFalsehood
Sun Aug 20, 2017 12:47 pm
Forum: Lighting & Electronics
Topic: Why is my 555 timer not blinking?
Replies: 30
Views: 1189

Re: Why is my 555 timer not blinking?

You might be right about the miscalculation. I'll rework it and see if I can find a configuration that works. You're thinking of a monostable configuration if you think it needs an exterior trigger to fire. The monostable configuration will only fire once. The astable configuration will oscillate on...
by MillenniumFalsehood
Sat Aug 19, 2017 6:05 pm
Forum: Lighting & Electronics
Topic: Why is my 555 timer not blinking?
Replies: 30
Views: 1189

Re: Why is my 555 timer not blinking?

Additional thought. Are you trying to make a strobe blink? I use a signal diode in parallel to r2 for strobing, which gives the short duty cycle. No diode if just going for a nav light cycle. Yeah, hence the 1N4004 (It's a 1N4004, not 4005, btw). I want a strobe, not a nav light. Without looking at...
by MillenniumFalsehood
Fri Aug 18, 2017 10:34 pm
Forum: Lighting & Electronics
Topic: Why is my 555 timer not blinking?
Replies: 30
Views: 1189

Why is my 555 timer not blinking?

I built a 555 timer in an astable multivibrator configuration. I checked all the connections and it looks like it's hooked up right, but when I apply power the light just stays on instead of blinking. This is a common problem I have with this type of circuit, but I'm not sure what causes it or how t...
by MillenniumFalsehood
Fri Mar 24, 2017 1:36 am
Forum: Construction
Topic: Got Resin?
Replies: 53
Views: 46721

It'll have to be a two-part mold, I'm afraid. I'm copying an old engine dome for the Enterprise kit, and it is a rather complex shape. I'm thinking about simply coating the interior of the cavity with degassed epoxy and then pressing the two halves carefully together to make a whole part. The part d...
by MillenniumFalsehood
Thu Mar 23, 2017 6:20 am
Forum: Construction
Topic: Got Resin?
Replies: 53
Views: 46721

If I degas it and put in a good mold release, can I cast epoxy glue?
by MillenniumFalsehood
Thu Feb 16, 2017 12:07 pm
Forum: Lighting & Electronics
Topic: Remote power for a removable module?
Replies: 5
Views: 896

No, I'm building the AMT kit, actually. :P

Is there any way to get more than 5v from the receiver coil? I can use 3.5v light sources if I have to and put in a voltage divider, but I would prefer to use the 12v LED tape.
by MillenniumFalsehood
Wed Feb 15, 2017 9:03 pm
Forum: Lighting & Electronics
Topic: Remote power for a removable module?
Replies: 5
Views: 896

Part of the problem with this is that the surfaces of the saucer and battlehead don't physically touch except on three standoffs. I could put wires through them, though. There are three, which could be the ground, +VCC, and strobe light control. I could also put in a magnetic reed switch to switch f...
by MillenniumFalsehood
Wed Feb 15, 2017 12:32 am
Forum: Lighting & Electronics
Topic: Remote power for a removable module?
Replies: 5
Views: 896

Remote power for a removable module?

So I'm working on the USS Enterprise-D, and naturally my client wanted the saucer section to be lit independently of the model... So I was wondering if the idea I had would work. I don't want the electrical contacts to be visible. Could I use a cell phone induction charger in the battle head to char...
by MillenniumFalsehood
Tue Feb 14, 2017 8:43 pm
Forum: Construction
Topic: MEK-dissolved styrene filler?
Replies: 12
Views: 1466

Thanks for all the input, guys. The reason I would rather use MEK than solvent-based welders is that it's cheaper. I can get a big can of it at Walmart for $4 vs. the $5 it costs to get a bottle of Ambroid or something. If drying time is really the only big disadvantage, then I think that will be fi...
by MillenniumFalsehood
Fri Feb 10, 2017 8:11 am
Forum: Construction
Topic: MEK-dissolved styrene filler?
Replies: 12
Views: 1466

Hmm... okay. What about dissolving it in something like Tamiya Thin or other solvent-based glue?
by MillenniumFalsehood
Fri Feb 10, 2017 6:56 am
Forum: Construction
Topic: MEK-dissolved styrene filler?
Replies: 12
Views: 1466

MEK-dissolved styrene filler?

So I am going to be building the SFSM Survey class vessel, and I was wondering how good or bad an idea it would be to chop up some of the scrap plastic left over from cutting out the parts, dissolving it in some MEK, then putting it in the oversized panel lines all over the model?
by MillenniumFalsehood
Fri Nov 11, 2016 7:33 pm
Forum: Scratchbuilding
Topic: What to look for in a desktop laser cutter?
Replies: 13
Views: 1961

What to look for in a desktop laser cutter?

I'm going to buy one of these fairly soon. My budget is $500 or less, and I need the machine to be able to cut through 060-080 gauge sheet styrene. But I don't have a clue what I'm looking for... I would hope it would come with software, too. So what would you guys recommend?
by MillenniumFalsehood
Wed Nov 02, 2016 4:14 pm
Forum: Construction
Topic: How to make photoetch parts with multiple layers of detail?
Replies: 3
Views: 911

How to make photoetch parts with multiple layers of detail?

So there was a really good video on making photoetch posted here a while ago, and I've been thinking about using it to make some detail parts for the Zvezda Star Destroyer kit (mainly the hangar crane and some ribbed detail for the edges of the engine bank). But it only explains how to do simple par...
by MillenniumFalsehood
Tue Sep 27, 2016 7:14 pm
Forum: Lighting & Electronics
Topic: Lighting a 350 Refit
Replies: 5
Views: 1273

Well, as long as the kit has a strobe and nav light circuit, it will do fine for your purposes.
by MillenniumFalsehood
Sat Sep 17, 2016 10:06 pm
Forum: Finishing
Topic: Metalizers and sealing coats
Replies: 2
Views: 804

Thanks for the tip. :) I'll give it a try on a piece of scrap plastic and see if it helps.
by MillenniumFalsehood
Sat Sep 17, 2016 2:21 pm
Forum: Finishing
Topic: Metalizers and sealing coats
Replies: 2
Views: 804

Metalizers and sealing coats

So I did some experimentation with Model Master buffable metalizer paints for a client's build, and while the paint looks awesome after you buff it, when I sprayed it with Testor's metalizer sealer, they ended up looking like I hadn't buffed them at all. Buffable metalizers are really delicate thoug...
by MillenniumFalsehood
Thu Sep 15, 2016 9:45 pm
Forum: Plates In Space Challenge
Topic: Who's ready for a new Challenge Build?
Replies: 77
Views: 8808

I've been looking through different serving plates. I've already identified several interesting ones to use for what I have in mind. :) I just wish I could move faster on this commission so I could get to this fun build! :D
by MillenniumFalsehood
Sun Sep 04, 2016 2:47 pm
Forum: Scratchbuilding
Topic: Excellent PE demo video
Replies: 3
Views: 1129

Yeah. I would actually suggest wearing rubber glove long enough to cover your forearm. But other than that, this is a really nice tutorial. Thanks for the link. :)
by MillenniumFalsehood
Wed Aug 17, 2016 12:40 pm
Forum: Lighting & Electronics
Topic: Shouldn't 12v be enough for seven 3mm LEDs?
Replies: 31
Views: 5247

Well, it depends on how the LEDs are being hooked up. I can't imagine 12V not being enough to power them all in parallel, because they only need about 3.5V each and in parallel, current is what varies, not voltage. I can see the LED tester testing them all in parallel because this will eliminate the...
by MillenniumFalsehood
Sun Aug 14, 2016 3:44 am
Forum: Lighting & Electronics
Topic: Powering LEDs with 3.7v Lipo
Replies: 3
Views: 1122

1. You certainly can power them with 3.7v :) 2. You'll want to include resistors on all LEDs anyway, in order to make sure they all get only the amount of current they need. 3. I don't, but the techniques you'd use are almost universal ones, so don't fret about whether you're doing it "right". Just ...
by MillenniumFalsehood
Thu Aug 11, 2016 8:04 pm
Forum: Lighting & Electronics
Topic: Monostable multivibrator problems
Replies: 11
Views: 2491

Heheh, yeah, I know... I'm just putting it off because let's face it, laziness is the mother of invention. :P I do intend to learn how to program them, though. I have the intention, when I can afford the sheer amount of materials it would cost to build it, to build an AT-AT that is remote controlled...
by MillenniumFalsehood
Thu Aug 11, 2016 3:33 pm
Forum: Lighting & Electronics
Topic: Monostable multivibrator problems
Replies: 11
Views: 2491

What strobe pattern is it you want to reproduce MF - single flash?? So if its just a single flash strobe you want to produce, then a single 555 could do the job. R1 = 15k, R2 = 220k, C1 = 10uF and a signal diode (say a 1N4001) across R2 would give you 0.1 sec high (on), 1.5 sec low (off) cycle As a...
by MillenniumFalsehood
Thu Aug 11, 2016 2:13 am
Forum: Lighting & Electronics
Topic: Monostable multivibrator problems
Replies: 11
Views: 2491

You two should have been in class the day the teacher introduced us to the monostable and astable multivibrator... Every single person in class was making... inappropriate jokes. :P
by MillenniumFalsehood
Wed Aug 10, 2016 12:22 am
Forum: Lighting & Electronics
Topic: Monostable multivibrator problems
Replies: 11
Views: 2491

The astable side is wired up like this: http://www.circuitstoday.com/wp-content/uploads/2009/09/555-astable-multivibrator.jpg Then the output is connected to the trigger on the monostable side, which is wired like this: http://www.circuitstoday.com/wp-content/uploads/2009/09/555-monostable-multivibr...
by MillenniumFalsehood
Tue Aug 09, 2016 5:02 am
Forum: Lighting & Electronics
Topic: Monostable multivibrator problems
Replies: 11
Views: 2491

Monostable multivibrator problems

So I'm trying to get a strobe light working using a 556 chip. I have the A side wired up as an astable multivibrator, and it functions just fine if I'm interpreting my meter right (~10v on, 0v off on the output pin, at the correct frequency). The B side of the chip is wired up as a monostable multiv...
by MillenniumFalsehood
Fri Aug 05, 2016 8:08 pm
Forum: Plates In Space Challenge
Topic: Who's ready for a new Challenge Build?
Replies: 77
Views: 8808

I'd love to participate in this. :) I have a few ideas that I've been wanting to model anyway that would use a plate as a basis for a big round... thingie.
by MillenniumFalsehood
Fri Jul 15, 2016 12:49 am
Forum: Scratchbuilding
Topic: Source for ribbed tubing?
Replies: 16
Views: 2887

I don't know of a source for just buying this, but for building your own, here's a build somewhat similar to what you are describing - the method used is *really* labor intensive, but yields good looking results. Go down this page till you get to "hot air intake hose for the carburetor" and then fo...