Faa-Yal Dragu
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« on: June 14, 2019, 04:14:27 PM » |
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Hey guys, I'm asking what is probably a very basic question... building my own saber. Going to be a stunt, not interested in sound (my son has autism, will hate the noise, wife will complain, and more work than I'm willing..)
So I know mostly what I'm doing here. Two standard AAA batteries, latching switch, red LED and module... my question is, do I need a resistor with this set up? If so, what kind and where will it go?
Also, the hilt I'm using is from.. somewhere else. Not obviously from the other guys, but clearly not an ultrasaber (for those who dont know, I have owned a few ultrasabers). Am I allowed to post a build thread on it on this forum? If so, where? I'm sure there was a build thread on here last time I was here, but I cant find it now...
Please and thank you!
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Infinit01
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« Reply #1 on: June 14, 2019, 05:53:25 PM » |
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This is the wiring that you need If you're using US' LED, you can contact them to ask what resistor you need. If you're using a different one, I'll need the following info for that LED chip which should come with the LED or you can contact the seller/manufacturer: Source voltage: if you're using standard AAAs then it's 3.0V because you're using two Diode Forward Voltage: Diode Forward current (mA): Keep in mind that two AAAs will work but they won't last as long as the standard AAA setup which has 4
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« Last Edit: June 14, 2019, 06:28:41 PM by Racona Nova »
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Racona Nova
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« Reply #2 on: June 14, 2019, 06:29:44 PM » |
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@Inf01: Corrected a few things Apart from that, Inf01 gave you all the info (!) that you need
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Faa-Yal Dragu
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« Reply #3 on: June 14, 2019, 08:33:28 PM » |
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Thanks for that! the forward voltage is 2.5v. And I intend on only using 2 AAA batteries if possible.
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The jedi only use their powers to defend and protect, although (waves hand) You will give me lightside points.
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Faa-Yal Dragu
Knight Lt. Commander
Force Alignment: 111
Posts: 497
Jedi knight, wandcrafter, heathen
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« Reply #4 on: June 15, 2019, 12:19:52 AM » |
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Clarify: 3 volts batteries, 1amp LED with forward voltage of 2.5 volts = 0.5 resistor. Is this correct? Would a 1 ohm resistor work or would I blow the LED?
Please understand, I cannot work this out no matter how hard i try, i will never be able to understand ohms law,its too complicated for my tiny little mind.
And please dont try to explain it, i really will not understand...
I would really appreciate it if someone could just hand me the answer i need. Sorry if I'm being a pain in the rancor...
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The jedi only use their powers to defend and protect, although (waves hand) You will give me lightside points.
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Racona Nova
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« Reply #5 on: June 15, 2019, 06:28:41 PM » |
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http://led.linear1.org/1led.wizYou need the source voltage (3v, apparently) and the forward voltage and current of your LED. Enter the values, and the calculator gives you the correct resistor Edit: A 1 ohm 1W resistor should be okay according to the website. The voltage is 2.5v and red normally has forward current of 700 mA (not 1000).
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Faa-Yal Dragu
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« Reply #6 on: June 15, 2019, 07:34:00 PM » |
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Brilliant, thank you. I really dont get why I can not understand ohms law, everyone else seems to understand it just fine! Oh well, I have skills in other places. Woodwork, mostly...
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The jedi only use their powers to defend and protect, although (waves hand) You will give me lightside points.
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tx_tuff
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« Reply #7 on: June 15, 2019, 07:42:52 PM » |
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That's why they have resistors calculaters online LOL. That's what I use Sent from my LM-V405 using Tapatalk
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Racona Nova
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« Reply #8 on: June 15, 2019, 08:55:16 PM » |
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Yeah, very useful I know the standard equation (R = U / I), but can't get it to work for LEDs either Seems that it must be modified in order to work...
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Faa-Yal Dragu
Knight Lt. Commander
Force Alignment: 111
Posts: 497
Jedi knight, wandcrafter, heathen
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« Reply #9 on: June 17, 2019, 12:04:00 AM » |
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Back with other irritating questions, sorry..
Thinking of popping 4 AAA batteries in there now, as I'm now putting a rumble motor in with it too. LED is 2.5v and runs on 1amp. What resistor do I need now? 3ohm? Also the rumble motor works fine with 2 AAA without resistors perfectly well, do I need a 3ohm resistor here too as I'm now using 4AAA? Also want to run both on the same circuit, how do I wire this up to maximum effect? I'll dole out points for this for helpful answers, promise!
Thanks.
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The jedi only use their powers to defend and protect, although (waves hand) You will give me lightside points.
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Racona Nova
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There is no good or evil....there's only power!
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« Reply #10 on: June 17, 2019, 12:14:56 PM » |
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The wizard says 3.9 ohm 3.9 W for the LED, however I'm not sure if the red really runs on 1000mA. I always thought it's 700mA (then it's a 5.6 ohm 2.7 W). Do you have the LED type or a link to the LED with the actual specs? Just want to be sure, I don't want to be the one to blame if you blow your LED module because of a wrong resistor http://led.linear1.org/1led.wiz?VS=6;VF=2.5;ID=700http://led.linear1.org/1led.wiz?VS=6;VF=2.5;ID=1000As for the rumble...I have no idea It should have a working range like almost all types of electronical components, maybe it can run on 4 AAA as well without a resistor.
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Sig by Master Nero Phantasm v3 LE (Obs v3) - AB w/ FoC AS---Manticore (Obs v3) - BR w/ FoC AS (QD)---Archon v2.1 (Obs v3) - RGBW Emerald
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