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Old 8th January 2013, 03:34 AM   #1
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Default PSU 2X19vac means

Hi All!

I need help to understand or an explanation the meaning of 2x19VAC? My Behringer MX2624A UPS was lost and this 2x19vac AC is the power source needed. Hope someone will enlighten me.. Thanks
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Old 8th January 2013, 06:17 AM   #2
MarianB is offline MarianB  Romania
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2x19Vac can be interpreted in segments like this:

-2x means two of the rated voltages, so in this case for example a power transformer with 2 identicall secondaryes, or as it is mostly sayd, a symmetrical power source.
-19V means the voltage rating of the supply.
-ac means the tipe of the current, in this case it is Alternate Current, witch means the current is going possitive and then negative in cycles, with respect to the 0V line, search the web for sinus wave immages and you will see what i mean.

So in conclusion, in your case you would nead a power source giving 2 symmetrical outputs rated at 19V alternate current, of shortly, Vac.
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Old 8th January 2013, 09:26 AM   #3
DF96 is offline DF96  England
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It probably means 19V RMS AC, either as two separate secondaries or one 38V RMS AC with a centre tap. After rectification this will give peak DC around 25V.
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Old 9th January 2013, 04:32 AM   #4
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So, this means the transformer secondary would be 19 - 0 - 19 ? I opened the back cover of my mixer to check the supply but its only indicated X15. Whats this mean? I really confusing if this is 15 volts or 19 volts ac? Please help if someone could put a diagram how to to that.. My unit is Behringer MX2642A mixer. Thank you & God bless!
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Old 6th April 2017, 01:26 AM   #5
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According to my research this mixer uses not a 19 X 2 type supply but a single 18.5Vac and a 3 Vac at 100mA as seen from off the actual product picture.
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Old 6th April 2017, 01:29 AM   #6
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I don't think from what I see the supply is a 2 X 19 Vac one as there is no indication of that. You have to be careful or the thing (mixer) might be damaged and these are not known for easy repairs.
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Old 6th April 2017, 09:43 AM   #7
AndrewT is offline AndrewT  Scotland
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Your pic in post45 shows: OUTPUT 1 as 2 x 18.5VAC/60Hz/13W
This is a dual secondary each with 18.5Vac when loaded to the full 13W and supplied with 120Vac to the primary.
i.e. 120:0-18.5, 0-18.5Vac @ 60Hz
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Old 6th April 2017, 03:12 PM   #8
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I think you are misunderstanding the terminology on the label. They are not saying that there are two 19Vac out (actually18.5) but that the 2 refers to the pin number. If there were 2 18.5Vac outs and then a 3vac out the connector must have then 4 pins and it does not. I suspect that one is 18.5Vac and the other 3 Vac a tap off the transformer or maybe a separate winding for filament voltage to a florescent tube.
My question that needs to be defined is what are the pin outs. Which one is 1 and 2 and then 3. After this is known a box could be made to simulate this supply. Any hobby person or Technician should be able to build this once the connection details are known.

I have a technical support case open with Behringer to see if they can help.

Last edited by skywaveTDR; 6th April 2017 at 03:42 PM.
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Old 6th April 2017, 06:12 PM   #9
AndrewT is offline AndrewT  Scotland
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Read OUTPUT 2 it says:
3.0Vac/100mA
There is no 2x in that output. To me that indicates there is only 0ne 3Vac output and to work it must have two wires.

The shell of the connector could be an output. That would add up to 4 output connections.
18.5Vac, 18.5Vac, 3Vac and reference tap.
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Last edited by AndrewT; 6th April 2017 at 06:14 PM.
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Old 6th April 2017, 07:05 PM   #10
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That could be but without support which they are not willing to provide, I can not waste an more time on this. I have 154 units to work on here.
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