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FreeTrack Forum > FreeTrack : English Forum > Support : Tracking System > what if i want to use an adapter

RSS >  what if i want to use an adapter, ive got a 4.5v 600ma adapter
mrclean816 #1 01/07/2009 - 00h25

Class : Apprenti
Posts : 44
Registered on : 18/06/2009

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which resisters would i need to use?
benmeijer #2 01/07/2009 - 01h05

Class : Habitué
Posts : 208
Registered on : 19/07/2008

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use the led calculator:

3 led setup (sfh485p)
4.5 volt
unregulated power supply
1.5 Vf
70 mA per led

answer:
Posted Image
R=20 ohm (in serial setup!)


if you use your existing parallel setup
Posted Image
R=47 ohm

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FreeTrack Forum > FreeTrack : English Forum > Support : Tracking System > what if i want to use an adapter

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