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FreeTrack Forum > FreeTrack : English Forum > Support : Tracking System > Easy build setup with SFH485P
benmeijer | #1 12/06/2009 - 19h52 |
Class : Habitué Off line |
I see so many questions in this forum about building a 3-led cap or clip with the SFH485P IR-led, that I decided to make a very easy scheme of it.
I think ANYONE can build this: PARALLEL BUILD 2x 1.5 (or 1.2) volt - battery powered) (If you use other type of leds, (not SFH485P) the shorter leg is almost negative ! check your datasheet) In this scheme I use 30 Ohm resistors to power the leds with 50 mA. If you use normal batteries ( 2* 1.5V = 3.0V) Feel free to use resistors (metal film or carbon film) between 20-40 Ohm. 1/4 watt E24 22 Ohm ---> 70 mA ---> led is very bright 30 Ohm ---> 50 mA ---> led is bright 39 Ohm ---> 40 mA ---> led is medium If you use rechargeable batteries ( 2* 1.2V = 2.4V) Feel free to use resistors (metal film or carbon film) between 10-25 Ohm. 1/4 watt E24 13 Ohm ---> 70 mA ---> led is very bright 18 Ohm ---> 50 mA ---> led is bright 24 Ohm ---> 40 mA ---> led is medium X-X-X-X-X-X-X-X-X-X-X-X-X-X-X-X-X-X-X-X-X-X-X-X-X-X-X-X-X-X-X-X-X-X-X-X-X-X-X-X-X-X-X-X SERIAL BUILD 5 volt - USB or adaptor powered The serial build was created later in topic #24 but I place it also in this starttopic so you can decide what build you do prefer. If you use a PTC, take in consideration that this component has some initial resistance (3- 5 ohm) my advice: use the 6.8 ohm! X-X-X-X-X-X-X-X-X-X-X-X-X-X-X-X-X-X-X-X-X-X-X-X-X-X-X-X-X-X-X-X-X-X-X-X-X-X-X-X-X-X-X-X Check if it is working properly X-X-X-X-X-X-X-X-X-X-X-X-X-X-X-X-X-X-X-X-X-X-X-X-X-X-X-X-X-X-X-X-X-X-X-X-X-X-X-X-X-X-X-X How to connect the wires Use a soldering iron if you have one If you don't know how to use a soldering iron use "wire glue"! or simply use
Edited by benmeijer on 05/03/2014 at 13h45.
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Joda | #2 14/06/2009 - 10h17 |
Class : Apprenti Off line |
You could add something about the battery life. No one seems to mention it anywhere and I think that's one of the most important thing. In this setup it's something like 14 hours?
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benmeijer | #3 14/06/2009 - 22h46 |
Class : Habitué Off line |
If you use 50 mA per Led ---> total (*3) = 150 mA.
I think a normal (good) battery gives 2000-2400 mAh. 2000/150 = 13.33 hours / 2400/150 = 16 hours ! You can use rechargeable batteries (1.2 V), I updated my post which resistors you can use then. If you use other voltage, calculate your resistor values here: http://www.free-track.net/english/hardware/calcled/ |
benmeijer | #4 23/06/2009 - 23h14 |
Class : Habitué Off line |
Updated my startpost, which resistor you need:
use metalfilm or carbon resistors use 1/4 watt E24 = tolerance (5%) colorscheme of resistors: or see this link for a table of E24 range: http://www.hobby-hour.com/electronics/e24-resistors.php
Edited by benmeijer on 11/10/2010 at 21h52.
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mrclean816 | #5 24/06/2009 - 01h03 |
Class : Apprenti Off line |
This last post is very confusing to me.
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benmeijer | #6 24/06/2009 - 10h17 |
Class : Habitué Off line |
Sorry for confusing you ..... I updated my startpost after reading yours, using 2 watt resisors. When you order resistors you have to choose from a wide variety of them. Most people don't know what to order. What I want to say is: - You can order Carbon or Metalfilm resistors (cheap!) - 1/4 Watt is enough (they are small) - E24 range= 5% tollerance (so if you order 100 ohm ... it's actually a value between 95-105 ohm) The colorscheme you can use to identify the value of the resistor, if you order for examle 3 values, they don't have a label on it. The color rings on the resistor gives the value. Example 30 Ohm = Orange-Black-Black + (gold) 1. Orange = 3 2. Black = 0 3. Black =1 (Multiplier) 4. Gold = 5% tolerance = (E24 range) 30 * 1 = 30 Ohm
Edited by benmeijer on 22/09/2011 at 19h52.
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sir_clive | #7 04/07/2009 - 20h43 |
Class : Apprenti Off line |
Just PERFECT, thank you very much! I was able to figure out how I would build it and what I would need, but nevertheless, your summary indeed spared me some thinking! :-)
I just ordered the components at Conrad (with 4 LEDs - I *know* I'll fry at least one of them, and they cost next to nothing anyway). I'll let you know how it turned out. |
nomad3k | #8 16/07/2009 - 08h49 |
Class : Apprenti Off line |
Thanks for this excellent and concise post. Just one question. Being someone who hasn't picked up a soldering iron for many years, I don't have any spare parts lying around the place, and am having to order everything, including the wire.
What is the specification for the wire? Farnell has a huge array of wire, which I just wasn't prepared for. |
benmeijer | #9 16/07/2009 - 13h45 |
Class : Habitué Off line |
Try to find installation wire 0.15 - 0.25 mm. (5-10 m) about 2 euro / dollar.
Or simply use old telephone wire or from a network cable .... or from an old mouse... Farnell has only long lenghts ... 25m and up order also some heat shrink (it shrinks when you heat it whit a sigarette lighter) for isolation in stead of tape. http://uk.farnell.com/tyco-electronics-raychem/rnf-100-3-32-0-4ft/heatshrink-2-4mm-black-1-2m/dp/1210351
Edited by benmeijer on 16/07/2009 at 14h38.
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gamecat666 | #10 17/07/2009 - 21h08 |
Class : Apprenti Off line |
Big thanks benmeijer, I was intrigued about FT, but hesistant to try this until I saw your 'no nonsense' diagram.
After finally finding the correct LEDs on Farnell (everywhere else they seem to be discontinued) i've stealthily wired them into a cap, nothing shown except the LEDS. (and the ironic thing? the cap is a Naturalpoint one! its a little cheeky, no? ) so, using a PS2 eyetoy that was unused, and old cap, 3 leds, 3 resistors and a battery box, thats about a fivers worth of kit. and it works GREAT! Ive been happily playing DCS:Black Shark, Enemy Engaged, and ARMA1/2, and its miles more fun now |
nomad3k | #11 19/07/2009 - 22h45 |
Class : Apprenti Off line |
Well I got it up and running, and I've not used a soldering iron in anger for about 15 years. Note to anyone making this though. Remember to buy a power switch. I have to keep taking the batteries out, because I didn't think it through.
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Jorge.PT | #12 19/07/2009 - 23h24 |
Class : Apprenti Off line |
Amazing, this is just like the cap I've made.
Great post, very well done!
Edited by Jorge.PT on 19/07/2009 at 23h25.
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benmeijer | #13 20/07/2009 - 22h37 |
Class : Habitué Off line |
Try to order a battery holder with a switch included!
Good to see the positive reactions. My goal is to encourage people who can't read electrical diagrams (like me ) to make a Freetrack hat or clip. See also my point model constrution: http://forum.free-track.net/index.php?showtopic=466&page=4#8487 |
saied | #14 23/07/2009 - 10h13 |
Class : Apprenti Off line |
dude. i think i can make this and its worth a try. the only problem im having is i dont know where to buy the leds and resistors from. if u could pherhaps tell us where u bought them from. i live in the usa
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saied | #15 23/07/2009 - 10h23 |
Class : Apprenti Off line |
also what does 'mea' mean
for example it says above 70 ma or 50 ma. what is that. thanks |
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