behringer sps1000/02 board in pmp5000 and pmp3000

[Mang_MN]

I am trying to seperate the PMP5000 AMP and Mixer. There are 6 wires running from the mixer and the Behringer SPS1000/02 board. Does anyone has a schematic or know ledge of these wires? i need voltage and what are those wires for. I know for sure that 1 of them is a ground and the other is a power supply for the mixer. so what are the other 4? Please help. I would greatly appreciated if you could email me at Mang@vnsba.com. Lots of thanks.

[Enzo]

There is a 6-wire cable from the power supply to the mixer:

1. +15VDC
2. -15VDC
3. A Ground (ground for all analog circuits)
4. +48VDC
5. +5VDC
6. C Ground (ground for digital circuits)

That should be sufficient to operate the mixer.

Is your HCA2400 blown up? You have to disconnect not only the heavy main power wires to the powr amp, but also the small 6 pin connector. The small 6 pin connector on the power amp will shut down the power supply if it does not detect proper operation of the powr amp otherwise.

[Mang_MN]

Thank you Enzo for the very useful information. But i came to a problem which I have no knowledge of solving. how do you get a -15v? a usual power supply provide +v and a - is also known as Ground. do you know any cheap way of optaining this power supply that can give sufficient voltage to power this mixer?

one other thing.
do you think it is feasible or safely for these 6 pins be run over a 100 feet snake cable with 5.5 ohm resistance? i am just too afraid it might fail or worst burn the mixer in the middle of a show.

Thank you for the info provided though.

Mang

[Enzo]

Um...

Look at a battery - it has a + and a - end. If I ground the - end, then the free end is a + supply. If I ground the + end, then the free end is a - supply. The - is NOT the same thing as ground. Very often the - end of a single supply is connected to ground, but only if it is a + supply. Most analog stuff has two supplies, one + and one -.

There are TWO 15v power sources in that power supply. Pin 3 is the ground. Pin 1 is the +15 and pin 2 is the -15. There would therefore be 30v between pins 1 and 2. Just as if you had two batteries, one wired each direction.

When you started the thread wanting to separate the powr amps and mixer, I had assumed you had something like a blown up power amp and still wanted to use the mixer part. If you are planning to try to remote the mixer part from the rest, I wouldn't recommend it, and especially by running that poor power supply up a snake. For that, I'd want a new power supply just for the mixer, and located right by or in the mixer.


Getting the signals from the mixer back to the power amps is a whole separate issue.

[Mang_MN]

Thanks Enzo for the opinion.

At first I was planning to do that because i want to save some money from buying a new power amp. The reason is you can mix better if you can sit a bit far back from the stage. I guess I'll save up 400 bucks for the Tapco J2500 then :D.

You have been very knowledgeful and helpful, Enzo. Thank you very much.

[fredy2]

Why not use longer speaker leads if you want to move the thing away from the stage? You can extend the leads a LONG way if you use heavy wire. Don't waste money on Monster cable if you want to go say 200 feet. Just get some #6 or #8 standard stranded wire from your electrical supply house and twist two together for the run. The twisting IS important as it reduces inductance and magnetic field radiation that could couple into other audio systems.

If you just want the preamp you could put dummy load resistors on the amp output and use the whole amp as a preamp/mixer.

I am currently looking for a schematic for the unit. The power supply popped a few components and I have traced out some of it.

The supply actually is two supplies. There is a small switcher that comes up first. Two power resistors start charging the main power amp portion and when those get stable, the power resistors that limit inrush are shorted by a relay.