1/24th Scale Functional Light bars?

[seven]

I came across this...

http://store.rc4wd.com/Pro-Line-Scal...r-_p_1149.html



And I started thinking if anyone has seen anything like this that would actually fit a 1/24th scale or 1/20th -

I've been trying to search and find anything I could use for light bars.


What have you fellas used, if anything?

[i luv duct tape]

never thought about it but it sounds cool

[BEELZEBOB]

I have seen them on toys and model kits.

but i dont think anyone yet makes them for "us" hobby folk.

[StreetKill831]

You'd be better off just making it yourself, that way it is exactly how you want it. Are you wanting it to be functional as well?

[seven]

Yeah, I want it to be functional - I thought about finding one, drilling out the back and gluing the LED's in, wiring to a 9V battery with an on/off switch.

[Krazy_Polak]

I did a little searching on Lego's website, and found some stuff that might work. Don't know what kind of quality you are looking for, but since it is all rather rigid and light plastic, it should be easy to sand and work with. Some parts I came across were the Hanger Bar and the Parabolic Reflector (they resemble the lamps). Hope this helps a little, keep posts on the light bar build

[StreetKill831]

Those reflectors are much to big to be scale. I have some sitting in front of me. They scale out to be a light with a 1 foot diameter.. huge.

[Krazy_Polak]

Originally Posted by StreetKill831

Those reflectors are much to big to be scale. I have some sitting in front of me. They scale out to be a light with a 1 foot diameter.. huge.

haha, didn't realize that. i used deep elled thumb tacks for my mock Hella light bar on by defender 110, you could drill the backs of those out easily

[johnnyh66]

I've thought about just useing led bezels, I think they'd work pretty good.
http://homanndesigns.com/store/index.php?main_page=product_info&products_id=44

[seven]

Originally Posted by johnnyh66

I've thought about just useing led bezels, I think they'd work pretty good.
http://homanndesigns.com/store/index.php?main_page=product_info&products_id=44

I think that would work!! You'd just have to put some engineering into making them look scale, but the front of them looks perfect.


Thanks for the link!

[spoo76]

I think some surface mount LEDs would be perfect for this

[seven]

Hopefully some electronic guru will chime in.


My question is will the reciever plug in be able to be cut, and install a 9v battery with an on/off switch? Would a resistor be required?


http://www.rcpcrawlers.com/product.p...7&cat=2&page=1

[Savage00]

Originally Posted by seven

Hopefully some electronic guru will chime in.


My question is will the reciever plug in be able to be cut, and install a 9v battery with an on/off switch? Would a resistor be required?


http://www.rcpcrawlers.com/product.p...7&cat=2&page=1

Usually when you plug anything into the receiver. It is designed to run off 5.5 volts. That is what a majority of receivers are putting out. I myself have built a 12 LED system for my Traxxas Slash 4x4. Most 3mm individual LED's are designed to run off 2.7 - 3.5 volts @ around 20mah. If you run more than 3.5 - 5 volts, you need to check the amperage output. I can't recall the actual amperage output of a 9volt battery.

I figured this out by trial, error and some research. If you increase the voltage, you need to increase the resistor load.

Hope this helps at all.

[seven]

That helps out quite a bit. I'm gonna do some research in resistors and do some math to figure out the best combination for this.

Originally Posted by Savage00

Usually when you plug anything into the receiver. It is designed to run off 5.5 volts. That is what a majority of receivers are putting out. I myself have built a 12 LED system for my Traxxas Slash 4x4. Most 3mm individual LED's are designed to run off 2.7 - 3.5 volts @ around 20mah. If you run more than 3.5 - 5 volts, you need to check the amperage output. I can't recall the actual amperage output of a 9volt battery.

I figured this out by trial, error and some research. If you increase the voltage, you need to increase the resistor load.

Hope this helps at all.

[Savage00]

Originally Posted by seven

That helps out quite a bit. I'm gonna do some research in resistors and do some math to figure out the best combination for this.

There are a couple sellers on Ebay that will give you the LED's + the resistors for 5V and 12V applications. Listed below is one seller I purchased from that is local in the USA. They also have resistors.

http://cgi.ebay.com/ws/eBayISAPI.dll...=STRK:MEWAX:IT


The most important thing to consider is the amperage. I made a mistake in the previous post. It is Amps not mah. Your gonna want at least a 100 Ohm 1/4 watt resistor for 5Volts application or 470 Ohm 1/4 watt resistor for 12Volt applications. If you run a 9V battery, I would use the 470 Ohm resistor.

[Kraken]

What resistor would you use with 2 3 mm led running
On 3.7 volt battery (the button type).
Thank you

[StreetKill831]

You take the voltage of your battery, subtract the specified voltage of the LED, and then divide by .02. You will need a resister equal to or greater than that number.

example:
9v battery
LED with a 3-4.5v rating(split it down the middle at 3.75v)

9 - 3.75 = 5.25

5.25 / .02 = 262.5

So I would need a resister equal to or greater than 262.5 ohm

Closest you will probably find is a 300ohm resistor.

[Kraken]

Sorry for the noob question, but what happen if I don't
Put a resistor in my setup? It's going to drain the battery?

[Savage00]

Originally Posted by StreetKill831

You take the voltage of your battery, subtract the specified voltage of the LED, and then divide by .02. You will need a resister equal to or greater than that number.

example:
9v battery
LED with a 3-4.5v rating(split it down the middle at 3.75v)

9 - 3.75 = 5.25

5.25 / .02 = 262.5

So I would need a resister equal to or greater than 262.5 ohm

Closest you will probably find is a 300ohm resistor.

Excellent break down Streetkiller831!!

[Savage00]

Originally Posted by Kraken

Sorry for the noob question, but what happen if I don't
Put a resistor in my setup? It's going to drain the battery?

It will probably give a quick flash, then become inoperable from that point on. Basically you just burned it out.