Search found 50 matches

by EVApodman
Tue Nov 21, 2017 5:10 pm
Forum: Lighting & Electronics
Topic: Why is my 555 timer not blinking?
Replies: 30
Views: 1149

Re: Why is my 555 timer not blinking?

All electrolytic capacitors should be used with the correct polarization to prevent the cap from overheating and possibly catching on fire or exploding. I've worked in electronics for many years and have had it happen to me several times.
by EVApodman
Sun Nov 19, 2017 12:49 pm
Forum: Lighting & Electronics
Topic: Why is my 555 timer not blinking?
Replies: 30
Views: 1149

Re: Why is my 555 timer not blinking?

Since you say that you successfully built a strobe light on bread board I can only assume that your wiring/soldering is the problem. Double check your wiring and connections. Personally I would have used a board with copper traces on it already. If possible remove the components and put them back on...
by EVApodman
Fri Nov 17, 2017 3:48 pm
Forum: Finishing
Topic: Painting a Checkerboard pattern
Replies: 10
Views: 448

Re: Painting a Checkerboard pattern

Your best bet is a decal set you can find at Microscale.

http://www.microscale.com/Merchant2/merchant.mvc?

Enter checker in SEARCH and it will list all the different kinds they have.
by EVApodman
Sun Oct 01, 2017 11:50 am
Forum: Construction
Topic: Help: idea for lens for Zveda star destroyer engines
Replies: 5
Views: 279

Re: Help: idea for lens for Zveda star destroyer engines

Try the Craft stores like Micheals. They have plastic eyes used for making dolls that can be cut in half.
by EVApodman
Sat Sep 30, 2017 9:25 am
Forum: Lighting & Electronics
Topic: Rotating Police Strobe Lights Effect
Replies: 15
Views: 774

Re: Rotating Police Strobe Lights Effect

Very nice.Now put inside the model!
by EVApodman
Sun Sep 10, 2017 11:48 am
Forum: Lighting & Electronics
Topic: How do you light complex shapes beyond simple fiber insertion?
Replies: 2
Views: 215

Re: How do you light complex shapes beyond simple fiber insertion?

Fiber optics are great for simulating panel lamps and other point sources. For larger illuminated areas, like ceiling lights or light panels, screens, etc. they won't work. A single LED behind the screen will produce a bright spot that is unrealistic even with a diffuser. A light box gives reflectio...
by EVApodman
Wed Sep 06, 2017 3:26 pm
Forum: Lighting & Electronics
Topic: Rotating Police Strobe Lights Effect
Replies: 15
Views: 774

Re: Rotating Police Strobe Lights Effect

Darkowski wrote:
Tue Sep 05, 2017 7:26 pm

I may have found a way, but it will still require 3 circuits. And the wiring will be insane lol
After they drag you off to a padded cell can I have your models?
by EVApodman
Thu Aug 31, 2017 2:09 pm
Forum: Lighting & Electronics
Topic: Rotating Police Strobe Lights Effect
Replies: 15
Views: 774

Re: Rotating Police Strobe Lights Effect

How many rotating strobe lights do you need. I'm guessing four from you message. It is possible to run four light from each output of your driver chip if they are wired in series, keeping the line current low. This will give you four lights all turning at the same speed. I would vary the positions o...
by EVApodman
Thu Aug 31, 2017 1:49 pm
Forum: Lighting & Electronics
Topic: Powering LEDs without resistors
Replies: 5
Views: 337

Re: Powering LEDs without resistors

All LEDS have a maximum of 20-25 ma forward current. Typically a single 1.5 cell may allow you to run LEDs without a current limiting resistor. Using batteries with higher voltages or hooking batteries in series will increase the source voltage and require a line current a limiting resistor. Hooking...
by EVApodman
Sun Aug 27, 2017 12:22 pm
Forum: Lighting & Electronics
Topic: Why is my 555 timer not blinking?
Replies: 30
Views: 1149

Re: Why is my 555 timer not blinking?

Basically the main areas that model lighting falls into is steady on, blinking and pulsing. The blinking is on/off an is usually used in navigation lights. This can be accomplished simply with a 555 chip. A dual 555 chip will enable you to have two rates of blinking with little increase in board spa...
by EVApodman
Sun Aug 27, 2017 11:24 am
Forum: Finishing
Topic: Beginner Airbrush Setup?
Replies: 15
Views: 877

Re: Beginner Airbrush Setup?

A single action only allows you to vary the amount of paint that is going on the model. Badger makes cheap beginner spray kits that are like this. A double action allows you to vary both the paint flow and the air pressure at the same time. This can give you some great effects but does require a bit...
by EVApodman
Thu Aug 24, 2017 3:46 pm
Forum: Lighting & Electronics
Topic: Why is my 555 timer not blinking?
Replies: 30
Views: 1149

Re: Why is my 555 timer not blinking?

Glad your chip is now blinking. Here is the data sheet for the 555 chip, I hope this can help with explaining monostable, astable, and other configurations. The 555 chip is a miracle chip for modelers enabling us to do many different things.

http://www.ti.com/lit/ds/symlink/ne555.pdf
by EVApodman
Tue Aug 22, 2017 3:43 pm
Forum: Finishing
Topic: Beginner Airbrush Setup?
Replies: 15
Views: 877

Re: Beginner Airbrush Setup?

I got mine at a welding supply place over 20 years ago. You have to buy a regulator that will drop the 1400 PSI of the tank to a more usable level and an adapter that goes on the regulator that allows you to connect your 1/4" brass air hose line fitting to. T he regulator will also have some sort of...
by EVApodman
Tue Aug 22, 2017 3:27 pm
Forum: Lighting & Electronics
Topic: Questions about navigation lights on fighter jets
Replies: 9
Views: 475

Re: Questions about navigation lights on fighter jets

In aviation a blue lens on the navigation light looks green at a distance.
by EVApodman
Sun Aug 20, 2017 11:34 am
Forum: Scratchbuilding
Topic: a new project , Aldebaran
Replies: 52
Views: 5331

Re: a new project , Aldebaran

I love old school scratchbuilt spaceships like this. The CGI ships while nice, lack a certain "crispness" that only something real can match.
by EVApodman
Sun Aug 20, 2017 11:32 am
Forum: Lighting & Electronics
Topic: Why is my 555 timer not blinking?
Replies: 30
Views: 1149

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. You say you want a strobe effect. Do you want a short, brigh...
by EVApodman
Sun Aug 20, 2017 11:20 am
Forum: Lighting & Electronics
Topic: 3 mm LED lights Series or Parallel
Replies: 9
Views: 483

Re: 3 mm LED lights Series or Parallel

In a series circuit the current is the same and voltage varies. The same current will flow thru LED and they will all have the same ( approximate) brightness. the down side is that if one goes they all go, but with correct resistor values they will probably outlast you. In a parallel circuit each LE...
by EVApodman
Sun Aug 20, 2017 11:14 am
Forum: Finishing
Topic: Beginner Airbrush Setup?
Replies: 15
Views: 877

Re: Beginner Airbrush Setup?

A compressor is a good idea. You can buy cans of compressed air but you will quickly find out that you are using several cans per model and the costs add up. So while a compressor may seem like a lot initially, it will save you money in the long run. Also make sure to get a compressor with an inline...
by EVApodman
Sat Aug 19, 2017 10:07 am
Forum: Lighting & Electronics
Topic: Why is my 555 timer not blinking?
Replies: 30
Views: 1149

Re: Why is my 555 timer not blinking?

Without looking at in person and having an o'scope I can only offer this help. The LED is blinking, but at an extremely fast rate due the RC time constant of of your timing resistors and capacitors. Try different values. The LED is blinking, but the duty cycle (ratio of on/off times) has it mostly o...
by EVApodman
Fri Aug 18, 2017 2:58 pm
Forum: Construction
Topic: Superglue
Replies: 27
Views: 2578

Re: Superglue

If I have difficult parts to glue together that will only come meet with me holding them tightly, then I will use a small amount of superglue to hold the parts together tightly until I can glue the whole piece. Other than that the only thing I use superglue for is to fill seams and such.
by EVApodman
Sun Aug 13, 2017 3:40 pm
Forum: Finishing
Topic: Basics. Weathering. Washes
Replies: 183
Views: 103914

Re: Basics. Weathering. Washes

Try Testors Glosscote but use a test piece first. On rattle cans you don't know how old they are. I suggest investing in an airbrush. You can get a cheap one from Badger to learn with.
by EVApodman
Sun Aug 13, 2017 11:09 am
Forum: Finishing
Topic: Basics. Weathering. Washes
Replies: 183
Views: 103914

Re: Basics. Weathering. Washes

hoth rebel wrote:
Sun Aug 13, 2017 6:16 am
So an acrylic wash will mess up the decals?
The water in them COULD loosen decals. I always seal in all my stuff before I start weathering.
by EVApodman
Sat Aug 12, 2017 11:49 am
Forum: Lighting & Electronics
Topic: LEDs & Other Low voltage, Low power lighting
Replies: 41
Views: 38123

Re: LEDs & Other Low voltage, Low power lighting

I just received them in the mail today and they work great. My problem is the Red and Green LEDs that Blink/Flash are too fast. I want to slow them down so they Blink/Flash 4 to 6 times a minute rather than off and on, which is much faster than I expected. I'm wondering if I need to restrict the fl...
by EVApodman
Sun Jul 30, 2017 11:22 am
Forum: Lighting & Electronics
Topic: Source For Ultra High Quality LEDs???
Replies: 14
Views: 643

Re: Source For Ultra High Quality LEDs???

And make sure you are placing them in such a way that they're not overheating as that is death to LEDs. It'll kill a diode faster than overpower it. And how does one achieve that, the way in which the LEDs get placed is pretty much dictated by the model itself? What about securing them in place? I ...
by EVApodman
Sat Jul 22, 2017 10:40 am
Forum: Lighting & Electronics
Topic: Number of Fiber to LED
Replies: 4
Views: 482

Re: Number of Fiber to LED

What are you trying to do here? Are you trying to illuminate clear windows by lighting up the interior or light windows by using fiber optic? If you are trying to light up the interior then the first step is to eliminate any light leakage by thoroughly painting the interior black until all light is ...
by EVApodman
Sun Jul 16, 2017 11:26 am
Forum: Lighting & Electronics
Topic: Lighting Moonbase HELP
Replies: 16
Views: 1168

Re: Lighting Moonbase HELP

I'm glad you were able to get all the LEDs lit and keep the current requirements down and still have a great model. I assume that the kit was permanently mounted to the wood base first and you then drilled from the top down. Are there points on the kit for mounting lights? The underside of the base ...
by EVApodman
Sat Jul 15, 2017 9:57 am
Forum: Lighting & Electronics
Topic: Source For Ultra High Quality LEDs???
Replies: 14
Views: 643

Re: Source For Ultra High Quality LEDs???

I have heard stories about LEDs used in commercial applications failing after a few months. Particularly the bright white ones. I've heard of ones failing after a few hours of continous use. I believe it has to do with the mixture of rare earths needed to achieve the white light as opposed to the mo...
by EVApodman
Wed Jul 12, 2017 6:50 pm
Forum: Lighting & Electronics
Topic: Lighting Moonbase HELP
Replies: 16
Views: 1168

Re: Lighting Moonbase HELP

Awesome!
by EVApodman
Sat Jul 08, 2017 10:28 am
Forum: Construction
Topic: Material weight limits for base to model supports
Replies: 5
Views: 631

Re: Material weight limits for base to model supports

I like the witch. Reminds me of the Fleetwood Mac song "Rhiannon" which was based on the tales of a Welsh witch.

Since PB will no longer support my 3rd party pics I posted earlier, here they are again.

http://s61.photobucket.com/user/2001shi ... %20shuttle