Behringer Denoiser SNR2000 schematics?

[Carlos]

Hi everybody,

the Behringer SNR2000 is the best single-ended noise reduction for guitar, I think.
I use it in the FX loop and I only need it for the high-gain channel of my tube amp.
The SNR2000 has a bypass with a relay so I'd like to switch both the channels of my amp and the SNR2000 on-off.

Does anyone have the schematics of the denoiser?

Regards

Carlos

[StephenGiles]

No, and against the ethics of this board to mess with currently produced units

[blanik]

No, and against the ethics of this board to mess with currently produced units

  90% of the layouts here are still in production...

lol 

[Carlos]

Hi Stephen,

according to their website and the Behringer service guy on the phone the denoiser was discontinued years ago:
http://www.behringer.com/SNR2000/index.cfm?lang=ENG.
They don't give away schematics, they haven't even got the schematics of this unit any longer! I just asked them for the part of the schematics that shows the relay hard bypass.
Has anybody got the schematics of this old and discontinued unit then?

Carlos

[Carlos]

Anybody?

[MartyMart]

A friend of mine is an EE who used to work for Roland and Akai amongst others
He has two/three of those units in the studio and swears by them !
He also modified them in some way, for better headroom or a +4/-10 issue ? .....

I'll ask if he has a schematic somewhere ....

MM.

[Carlos]

MartyMart,
that would be great!

Carlos

[Carlos]

MartyMart,

has your friend got the schematics of this device?

Regards

Carlos

[Mark Hammer]

1) Looks like a very nice unit.  And you are correct.  The combination of downward expander and envelope-controlled noise filter has been widely regarded as one of the best single-ended noise solutions for quite some time.  The extra control this unit provides should, in theory, do a great job.

2)  From your description of your needs, it all seems feasible.  Something which perhaps may not be spelled out by a mere schematic, though, is what sort of relay is in use.  If both units (amp and noise reduction) employ latching relays that only require momentary switches to actuate, then that is workable.  If both use nonlaching switches to actuate, that is also workable.  In each case, there is likelya single contactthat must be made to actuate the relevant relays and you can certainly buy multicontact stompswitches of either latching or momentary type.  My concern is whether possibly one uses latching and the other uses nonlatching.  Such an arrangement would complicate the situation.

[MartyMart]

MartyMart,

has your friend got the schematics of this device?

Regards

Carlos

I spoke with him and it's tucked away in his loft !!
He'll get to it at some point ........ can't do any more than that !

MM.

[Carlos]

Thanks a lot, Marty.
Maybe I just open the device and examine the PCB. It may be easier than expected. I can't get down to it right now.
I will definitely take some pictures of the PCB to post it here if I'm successful.

Carlos

[Mark Hammer]

It may be easier than expected.

Quite possibly.  Remember that whenever a relay is used, many connections can be made at once in the relay by using a single simple switch to actuate it.  Indeed, that is one of the reason to want to use relays.

So, it may be that your onboard bypass switch is simply a "soft-touch" SPST pushbutton that actuates the relay.  If that is the case, then it would be simple to find the solder pads the switch connects to in the SNR2000, and run two leads out to a jack you install on the rear panel (either a mono or a stereo jack, depending on the switching scheme).  Then you simply run a cable from that jack to your floor-switch.  If the amp's channel-switching relay is actuated in a similar manner, then there is no reason why the two leads from the SNR2000 and the two leads from the amp could not co-exist in the same multi-pole stompswitch.

Problem solved (in theory).

[StephenGiles]

"The combination of downward expander and envelope-controlled noise filter has been widely regarded as one of the best single-ended noise solutions for quite some time.  The extra control this unit provides should, in theory, do a great job"

The Drawmer DF320 does this - the circuit is posted here somewhere.

[kvb]

Searched "Drawmer DF320 " and got another StephenGiles post:

http://www.silonex.com/audiohm/pdf/expgate.pdf
http://www.morleypedals.com/gdbes.pdf

uncle boko in 2003 wrote "You need a Drawmer DF320 noise filter, it uses That2150 x 2 and SSM2120 + lots of side chain circuitry "
No schematic was posted

Paul Perry (Frostwave) wrote in 2004 "Just to muddy the waters, here are some links to the NE570 and NE572 thanks to Midwest Analog Products."  http://www.midwest-analog.com/diychips.html

Nasse in 2004 gave this link : http://www.promelec.ru/pdf/ne572.pdf

[Carlos]

Mark Hammer has exactly said what is at the back of my mind and what I'm hoping for.

Carlos

[StephenGiles]

Searched "Drawmer DF320 " and got another StephenGiles post:

http://www.silonex.com/audiohm/pdf/expgate.pdf
http://www.morleypedals.com/gdbes.pdf

uncle boko in 2003 wrote "You need a Drawmer DF320 noise filter, it uses That2150 x 2 and SSM2120 + lots of side chain circuitry "
No schematic was posted

Paul Perry (Frostwave) wrote in 2004 "Just to muddy the waters, here are some links to the NE570 and NE572 thanks to Midwest Analog Products."  http://www.midwest-analog.com/diychips.html

Nasse in 2004 gave this link : http://www.promelec.ru/pdf/ne572.pdf

http://www.4shared.com/dir/1321731/a7e7124c/sharing.html

[Carlos]

Last night I opened the denoiser of our keyboard player in our rehearsal studio.
Lots of customized ICs with "Behringer" printed on them and SIL ICs on ceramics wafers and then gooped (pre-SMD technology).
The relay is controlled by a transistor. When the denoiser is switched off, the relay bypasses the denoiser.
I will post some pictures soon.
Carlos