TC420 multiple voltages - The Planted Tank Forum
 
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post #1 of 7 (permalink) Old 07-25-2017, 04:45 AM Thread Starter
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TC420 multiple voltages

setup my Beamswork 48in Quad snake eyes this weekend with a TC420. I added 6 50cm RGB 5050 rigid strips in the channels between the lights. right now there all powererd by a 12v PSU running at 13.5V (so running RGBs a bit hot and the rest quit a bit lower) lost a lot of light which I expected. right now have half the light switched with one of th 15v PSU (it has 2 seperately switched banks of lights) to give it 5 hrs of that bank at full strength). I saw someone use a simlar controller with 2 different voltages on here. woundering if this would work with a TC420



https://www.plantedtank.net/forums/12...aquariums.html

Bump: quick video of where the light is now functionality wise.

https://www.youtube.com/watch?v=cRjz7RSgYN8
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post #2 of 7 (permalink) Old 07-25-2017, 02:02 PM
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You could use a relay triggered by the TC420 to open a higher voltage circuit powering the Beamswork lights.

BTW, what kind of fish are those in your video?
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post #3 of 7 (permalink) Old 07-25-2017, 02:28 PM
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Don't know who had dual voltage but one past suggestion is to use power diodes to drop voltage on a channel

Each one in series drops 1.5V (need to double check this number)
So 15V ps for the Beamswork and 2 series diodes to cut it to 12 v on another channel.
Watch for diode heating.

CORRECTION:
Quote:
In a small silicon diode operating at its rated currents, the voltage drop is about 0.6 to 0.7 volts.
so 4 in series..


Actualy adding a 3W LED b4 the light bar should work too.. Drops 3V or so.Would need a heat sink.

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Last edited by jeffkrol; 07-25-2017 at 05:39 PM. Reason: edit
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post #4 of 7 (permalink) Old 07-26-2017, 05:04 AM Thread Starter
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so I think I know the answer to this. but I can't take my 2 15v 6amp PSUs that came with my beamswork and run them in parallel right? i'd have to source a large 15V psu correct?
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post #5 of 7 (permalink) Old 07-26-2017, 05:58 AM
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I'm not quite sure how you have your light setup. But you can limit the current using the TC420? I use the 15V PS on rgb strips and decided to keep them under 75%. ( I don't remember how I came up with that %) but my rgb program only goes up to 40% red at sunset. So I actually keep them under 40%.
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post #6 of 7 (permalink) Old 07-26-2017, 12:53 PM
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Quote:
Originally Posted by Kampo View Post
so I think I know the answer to this. but I can't take my 2 15v 6amp PSUs that came with my beamswork and run them in parallel right? i'd have to source a large 15V psu correct?

Well like most things in life, never quite that straight forward..

You can run the 2 in paralllell BUT it's rarely done and usuallty reserved for power supplies that are built for that purpose (usually as an option)
Not sure exactly why but has to do w/ power sharing and prob. a half dozen electrical "things"

Lets just say not standard. not recommended..

Best to get a "fitting" power supply.

https://www.digikey.com/en/articles/...s-and-parallel

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post #7 of 7 (permalink) Old 07-31-2017, 12:13 PM Thread Starter
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figured out a real easy work arround. just used one of those RGB amplifiers. takes the signal from the 15v running thru the TC420 then outputs voltage at whatever voltage the powersupplyplugged into it is.

Something like this
https://www.amazon.com/HitLights-Lig...=rgb+amplifier
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