> Easy build setup with SFH485P, Anyone can build this ! (for 5v Usb serial build see Page 2)
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Milla |
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Thanks nadrealista and benmeijer. I think I can afford the extra GBP 0.50 for the metal ones!
It looks as though Farnell has a minimum order of £20 unless you have a trade account or corporate payment card. I may have to get the components elsewhere
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Happynoobing |
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Got a question about the PTC fuse for the USB design. Since we are only using 50mA for the LEDs and the maximum current is 100mA (SFH485P), can I use a PTC fuse with hold current of 50mA and trip current of 100mA? (as opposed to the 200mA hold and 300mA trip mentioned in the guide on page 2 of this thread)
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benmeijer |
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You can use a PTC fuse with 50 mA hold / 100 mA trip. Only if you use a 10 ohm resistor / 5V power.
If you use a 6.8 ohm resistor/ 5V power (current = 70mA) choose an other one with higher "hold" values.
Rule for PTC:
I (hold) >= Total current in assembly of your build
I (trip) < max. 300 mA
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Happynoobing |
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benmeijer @ 09/03/2010 - 21h27 a dit: You can use a PTC fuse with 50 mA hold / 100 mA trip. Only if you use a 10 ohm resistor / 5V power.
If you use a 6.8 ohm resistor/ 5V power (current = 70mA) choose an other one with higher "hold" values.
Rule for PTC:
I (hold) >= Total current in assembly of your build
I (trip) < max. 300 mA
ah thx. which current do most people use? perhaps i can add a 3 way switch to toggle between off, 50mA, and 70mA? 
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benmeijer |
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Check this reply (from Falcon) in this topic (30 mA -70mA).
http://forum.free-track.net/index.php?showtopic=1856&page=2#12654
The more current you use, the led's are brighter. Depends on your webcam sensitivity. I use a WiiMote / with 50 mA current.
Be the first to build a tracking device with a variable brightness.
If you planning to build this, check the values of the PTC! |
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WarpSpider74 |
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Posted my model based on the USB powered build in the point model gallery here
Thanks for the excellent setup benmeijer!! |
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jetkid |
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benmeijer @ 14/11/2009 - 00h02 a dit: New scheme for serial build using 5V USB power:
edit 1: (If you use other type of leds, (not SFH485P) the shorter leg is almost negative ! check your datasheet)
edit 2: for resistor use 1/4 watt / for PTC use 200 mA(hold) / 300 mA(trip)
for a example, see my latest construction:
fullsize pics here:
http://forum.free-track.net/index.php?showtopic=466&page=8#12613
i'm going to build my clip with this suggested design.
i think rj11 wires are ok to make connections...
is it right?
or what can i use?
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nadrealista |
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You can use those wires. Current and voltage are too small to be an issue.
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jetkid |
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thx a lot.
i got it 
as soon as possible i'll post my work...
Edited by jetkid on 04/07/2010 at 14h44. |
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patrikje |
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benmeijer |
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Use a lower value than 250 mA
Like this one: http://shop.conrad.nl/componenten/componenten-elektromechanisch/zekeringen/multifuse-zekeringen/551180.html
will hold current of 100 mA , trips (cut off) above 200 mA.
250 mA should be the max. |
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patrikje |
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So using that one is good when i dont want to destroy my motherboard?
And a USB cable of a regular mouse will do?
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Racefreak |
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Hello everyone, I'm new here.
And I am mad as hell right now, because since like a week now I've been trying to build my own 3 LED Cap. Somehow it just wont work.
I'm using the SFH485P IR-LEDs and I followed the very good instructions in this thread to the point. My resistors are 33 Ohm, 5% and my Powersupply is a regulated 3V ...well powersupply. I also tried 6V and even up to 12V. Nothing happens.
So what did I do wrong? 
It can't be that hard, can it?
Please guys help me out, I'm desperate right now!
Sincerely yours,
Racefreak
EDIT: For my powersupply I'm using a plug which is also used in headphones.
Something similar to Viper3Two's Video on YouTube at 10:25min. |
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benmeijer |
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patrikje @ 14/07/2010 - 15h35 a dit: So using that one is good when i dont want to destroy my motherboard?
And a USB cable of a regular mouse will do?
If you're afraid to destroy your motherbord, use external power like telephone adaptor or usb power charger.
I assume you want to use the usb / mouse cable for wiring the leds, yes you can.
@ Racefreak : have you checked your build with a digital camera? ...... IR light is invisible for your eyes, just like a remote control.
Are you're sure you have the right resistors .... not 33 kilo-ohm? you've checked the long leg of the led is on the negative side. I hope you don't destroy them using 12 V.
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Racefreak |
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benmeijer @ 15/07/2010 - 00h41 a dit:
@ Racefreak : have you checked your build with a digital camera? ...... IR light is invisible for your eyes, just like a remote control.
I feel totally stupid now. 
I'll check that immediately.
Thanks for the hint, man!
EDIT: At least I'm not alone. My wife didn't think of that either. 
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