FreeTrack Forum - How to install HW for 4.5V 800mA DC power supply?

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FreeTrack Forum > FreeTrack : English Forum > Support : Tracking System > How to install HW for 4.5V 800mA DC power supply?

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RSS > How to install HW for 4.5V 800mA DC power supply?

4ever	#16 22/01/2012 - 15h30 Top
Class : Apprenti Posts : 16 Registered on : 22/12/2011 Off line	dewey1 @ 22/01/2012 - 15h14 a dit: Well it is useless doing any calculations until you specify a part number and brand of IR LEDs that you can get. Do they have a selection of IR LEDs to choose from? This pack? I wanted to understand it. Yeah, that is exactly the same power pack.
dewey1	#17 22/01/2012 - 17h16 Top
Class : Habitué Posts : 191 Registered on : 25/06/2010 Off line	Check your PM!
4ever	#18 22/01/2012 - 23h14 Top
Class : Apprenti Posts : 16 Registered on : 22/12/2011 Off line	So I loaded the power pack with 12V bulb and measured the voltage. Suprisingly its value is between 5,75 and 5,77V. So here is new calculation for 5,8 voltage. `V I [mA] R [ohm] 1,20 20 60 led 1,20 20 60 led 1,20 20 60 led 2,20 20 110 resistor SUM:5,80 20 290 Check: 5,8/(20/1000) = 290` Edited by 4ever on 22/01/2012 at 23h17.
dewey1	#19 23/01/2012 - 02h48 Top
Class : Habitué Posts : 191 Registered on : 25/06/2010 Off line	Series Circuit based on Vf of 1.2 5.8-3.6=2.2 2.2/.02=110 Ohm Use a single 100 Ohm for the series circuit for 22 mA actual current. ------------------------------------------------------------------------------------ Parallel Circuit based on Vf of 1.2 5.8-1.2=4.6 4.6/.02=230 Ohm Use three 220 Ohm for the parallel circuit for 21 mA actual current per LED. ----------------------------------------------------------------------------------- Series Circuit based on Vf of 1.5 5.8-4.5=1.3 1.3/.02=65 Ohm Use a single 56 Ohm for the series circuit for 23 mA actual current. Probably your best over all option! ------------------------------------------------------------------------------------ Parallel Circuit based on Vf of 1.5 5.8-1.5=4.3 4.3/.02=215 Ohm Use three 220 Ohm for the parallel circuit for 21 mA actual current per LED. ----------------------------------------------------------------------------------- Check your PM!
4ever	#20 23/01/2012 - 10h03 Top
Class : Apprenti Posts : 16 Registered on : 22/12/2011 Off line	Today I came to this topic and see no new posts even the last one of mine yesterday. But I sent this one and oala here they are. Edited by 4ever on 23/01/2012 at 10h05.

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FreeTrack Forum > FreeTrack : English Forum > Support : Tracking System > How to install HW for 4.5V 800mA DC power supply?

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