Today's Message Index:
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1. 12:10 PM - Can you run multiple LEDs on same dimmer? (rparigoris)
2. 05:58 PM - Re: Z101 has been released under Rev A (nuckollsr)
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| Subject: | Can you run multiple LEDs on same dimmer? |
Hi Group
We're trying to run multiple LEDs together with dismal results. Any ideas?
We have four 365nm (UV / Black Light) LEDs. They are from flashlights that run
on 2 series AA batteries with no resistor. They are made in China and are touted
as 3 Watt, but when running on bench, with 3 volts most will run up to 500mAs,
but to make sure we want to limit to 400mAs.
We tried running in series with a series potentiometer, some draw more amps than
others and brightness is not the same. We tried running parallel resistors with
the bright ones, no joy. We tried Constant Current regulator with 4 LEDs and
also with 2 LEDs. No joy. Tried parallel and series resistors with the bright
LEDs with 2 and 4 LEDs on a constant Current regulator. No joy. Also tried
the same with Constant Voltage regulator. No joy.
We want to run 4 LEDs together with at least a high and low setting. We can make
1 run fine with a constant current regulator, but it eats up 700mAs to get a
regulated 350 mA draw from the LED.
The problem with running 4 separate regulators is we would be drawing probably
3 amps on high.
I don't know if they make a 4 station variable resistor so you could have 1 knob
to control 4 regulators?
OK, any ideas how I could control 4 LEDs that don't want to play nice with each
other?
Second choice would be to run 2 series.
Thx. Ron P.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=511243#511243
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| Subject: | Re: Z101 has been released under Rev A |
Dear Bob,
is the Z101 source as well available as dwg file so I can taylor it to
my new project (SDS/emag/no brownout).
Sorry for the relative silence. My email service has been
on the fritz (on account of new Google 'security' features)
for several weeks. I think we're close to resolving the issues.
So for you folks that are missing replies from me . . . especially
those with gmail accounts . . . I expect to be up and running
shortly.
Thanks a lot for your help, BTW will the next edition of your book
include these new diagrams?
The latest diagrams on on the website. Z101B is current
at http://aeroelectric.com/PPS/ACAD_Architecture_Dwgs/Z101B.dwg
The z-figures folders
are where upgrades take place to be included in future
editions. Rev 12 is current. You can download a .pdf copy
of the print edition following links on the website.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=511244#511244
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