The Power Supply of Behringer Xenyx 802 and Eurorack UB802, UB502, UB1002, 502, 1002

Here are the specs: USA/Canada model: 18.5VACX2 250mA.   Here are the pinouts with diagram and voltages.

My PSU measurements are in AC volts, there is a negligible voltage between the metal connector and any pin, and I checked for DC voltages in all combinations, and found none.  These are AC voltages!  Also note, that the power supply says something about a 3V 100 mA output, but there is absolutely no evidence of it.

ImageImage

My power supply came with my Xenyx802 and it is labeled “Eurorack power supply”.  I found that a bit odd.  Here are the other labels:

BEHRINGER
MODEL: MXUL3
ITEM NO: PSU-MX3-UL-01
INPUT: 120V~60Hz 14W
OUTPUT 1: 18.5V~ X2 250mA
OUTPUT 2: 3V~ 100mA
MADE IN CHINA

The voltages are :left pin to center pin: 20.7VAC
right pin to center pin: 20.7VAC
left pin to right pin: 41.9VAC
(no other measurable voltages anywhere).

I own both a Eurorack UB802 and a Behringer Xenyx 802, and the PSU which is pictured above, says on it MXUL3 (this is not a typo), is from the Xenyx 802, and works on either mixer.

Here is what the user manual to the Xenyx 802 says about the Power supply:

—————– >8  user manual start ——————

502/802/1002
Power consumption 13 W

USA/Canada
Adapter: Behringer PSU MX3UL (yes, this is not a typo)
mains voltage 120V~,60Hz

Europe/U.K/Australia
Adapter Behringer PSU MX3EU
Mains voltage 230V~, 50Hz.

—————– >8  user manual end ——————

Here are a few weird things I have noticed.

1. There really is no 3V rail that is used on the power supply

2. There are many variations of power supplies out there, some say 3V, others leave it off, some say 13W

3. With a Eurorack with no power supply, I have great interest in creating one.  One day I plugged an 18 Volt AC supply into two pins, and the Eurorack seemed to function.  My guess is the other two pins are for the phantom supply.  When I say “seemed to function”, it seemed to mix all channels to the main mix bus, with no problems, and no noticeable distortion.

3. I was tired of a mixer with only two pre-amps so I connected the two mixers together using only one power supply.  It was a simple matter of connecting the power supply line from one mixer’s preamp to the same place on the other mixer.  The reading on the first pre-amp was about 23 or 24 volts DC.  I used only two wires, one for positive, other for negative.  The funny thing is that the 2nd mixer works beautifully, and I tried ALL its functions, except phantom power, and the interesting thing is that the 2nd mixer’s heatsink was very very cool.  So my guess is that there is a circuit which creates the phantom power that accounts for almost all of the heat generated by these little mixers.  Just an interesting observation.

4. Noting item 4 above, my guess is a similarly connected 24 volt DC supply might possibly power one of these machines, and bypass all that circuitry that makes things hot.

5. If you read this, please leave a thanks, share the luv!  :)

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About SunKing2

Java programmer, connected web enthusiast, guitar player
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14 Responses to The Power Supply of Behringer Xenyx 802 and Eurorack UB802, UB502, UB1002, 502, 1002

  1. Anonymous says:

    Hi Guys,
    if the pins have broken in the connector of your mains adaptor and your good ( dont have to that good) with a soldering iron use a pair of nail clippers and slowly cut the outer sheath of the connector then get a pair of pliers and pull the steel sleeve leaving you with and other black sleeve to cut LEAVE THE PIN CONNECTER INTACT you need that to see where the wires solder just cut along the bottom plastic sleeve and cut it not to deep at a time and use your finger nails to prise it apart ,keep cutting not to deep and trying to prise it apart finally there might be a bit if tape covering the wire unwind the tape an you should be left with the tiny top piece where the broken pins are and you should be able to see where the wires solder to what pins. and you need to wire the new connector the same way, Make sure the wires dont touch each other or metal sleeve,
    Hope this helps,
    This is only a guide do the work at your own risk ( Take your time and all should be well )
    I saved myself $73.00 on the price they wanted for a new adaptor the part only cost me $1.99 on ebay ( 3 Pin Mini Din ) for 2 dollars it was worth a try
    Good luck

  2. Ric Helm says:

    Hi.
    I just acquired a Behringer 1202FX without a power supply. In searching the web it appears that Behringer has a serious problem with the reliability of their power supplies. Pins breaking, the supply unit failing and appears on many of the different models.
    Perhaps it is better not to use the Behringer OEM power supply….

    Thankx for the pinout info. I will be adding an on/off switch inline with the power supply..And that @$)*$ Blue LED? I am replacing with a larger value resistor.

  3. rabahya says:

    would it be possible that the power supply is only giving one side power only? I have only right channel working. Power button off but 48v light on and everything seems to work but in mono (right channel only).

  4. @Geoff thank you for your post for providing indepth information.
    With this i was able to build my own psu for my UB802 (bought one, psu was missing) for under 10 bucks.

    I imagined that it needs to be 2*18v to supply the Phantom Power (2*18V * 1.41 = about 50V minus diode losses equals around 48V)
    But it seems that it is regulated to +-15V and than converted to +48 with an step-up circuitury, right ?

  5. billybrah says:

    Man, the 1 pin broke on my mxul3, so I ordered a 3-pin mini DIN connector. There’s no way I’m paying $30-$40 for a new mxul3 when the 802 was only $50 on sale! I thought of getting a similar Yamaha mixer, but I can’t I justify that when I’m supposed to be getting Christmas presents, and the 802 is perfectly fine. Cussing with the soldering iron it is!

  6. Pawel says:

    Hi,
    I am very happy I have found your post. Just have become a jolly owner of XENYX 1002… without any power supply unit:) And don’t want to spend for it more I have paid for mixer:) In manual I’vr got it statest the MX3 PSU gives 2 x 18,5~v. That’s all. Not a word about 3V.
    Musical equipment uses AC external power supplies very often. Any supplied voltage must be filtered inside the device anyway to eliminate noises, interferences and so on, so current rectifier, stabilizer and filters are just built-in.
    Now I know how to connect power wires to pins in plug.
    Thanks.

    • Geoff says:

      After I wrote that reply, I took the unit apart to check to see if there was any chance it could be battery-operated, and the answer’s NO!
      The power supply is simply a 36vAC centre-tapped transformer (the 3v o/p noted in my previous post, is not used in this unit). The two 18v lines are full-wave rectified inside the mixer unit using a standard bridge circuit to provide about +/-22vDC which is then regulated to +/-15v, and that’s what generates the heat. The +/-15v provides a balanced supply for all the lo-noise op-amps which comprise the guts of the mixer, an optimum design, and one which is likely common to all the XENYX mixers, each with more repetitions of the XLR input circuitry. This is a lot of electronics for the price, with at least 10 dual lo-noise op-amps in the little unit, maybe more, and many lo-noise, hi-reliability controls, several stereo. But it’s never going to run from a pair of 9v batteries!!

  7. Geoff says:

    Hi SunKing2! (hope that’s the first poster’s name) I just unpacked a 503 mixer with this PwrSy, and checked your figures: all true, I think! The 3V o/p is a 5mm coax female socket located beside the mains input interface.
    I was interested in your work connecting two mixers together: which pwrsy pins (18vac) did you use? I want to run this mixer from a battery, and if the mixer circuitry will support it (without ground loops), it may be the same battery I’m using to power a PA (100W car stereo amp) driven from a single 12v 7AH gel cell. What I want to do may not be possible without additional eqpt, which I’ll build if needed,
    Would be interested in further discussion!

  8. jose hernandez says:

    hOLA MI NOMBRE ES JOSE QUISIERA SABER SI TIENES ESE POWER SUPPLY QUE APARECE EN ESTA PAGINA, Y SI LO TIENE LO VENDES ESPERO RESPUESTA MUCHAS GRACIAS

    • rnandez says:
      September 5, 2013 at 3:50 am
      hOLA MI NOMBRE ES JOSE QUISIERA SABER SI TIENES ESE POWER SUPPLY QUE APARECE EN ESTA PAGINA, Y SI LO TIENE LO VENDES ESPERO RESPUESTA MUCHAS GRACIAS
      Reply

  9. MIGUEL ANAYA says:

    HELLO I WANT TO KNOW HOW MUCH POWER SUPPLY I LEAVE MY INFORMATION
    MIGUEL_FUNCIONAL@HOTMAIL.COM
    THANKS

  10. Anonymous says:

    Hi.. i found a XENYX 802 at a friends house, he never used it, its the kind of thing that appears at home and you dont really know how.. anyways, the power supply is missing, how should i know what voltage or which power supply to get??

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