Boss - NS-2 Noise Suppressor

Post by **azrael** » 14 Jan 2011, 19:07

Found this schematic, don't think there's a previous topic on it.

Is there room for improvement in the circuit?

snmavronis · Post by **snmavronis** » 20 Mar 2012, 00:26

Someone e-mailed me from here (Lukas?) looking for photos of the Boss NS-2 circuit board. I didn't want to unmount mine from the pedalboard so did a Google image search and found these:

pedalgrinder · Post by **pedalgrinder** » 21 Mar 2012, 08:59

where did the schematic go everytime i click on it it won't load just a small square with a red x and ns2 written in it. thanks

pedalgrinder · Post by **pedalgrinder** » 21 Mar 2012, 10:26

https://www.freestompboxes.org/viewtopic ... 10#p174436

Here is the ibanez Noise Buster that for some reason goes under the radar. I could be wrong but the beauty of this unit is the ic does most of the work where from what i can tell the boss ns-2 seems to use a electronic attenuator then the circuit filters out via a side chain and triggers the electronic attenuator in a similar way to the ibanez noise buster. Rocklander has done a really good layout of this pedal i haven't had a chance to try yet but am looking forward to. He has done a really good job i take my hat off to him.

pedalgrinder · Post by **pedalgrinder** » 21 Mar 2012, 10:30

one thing i forgot to add it is the lm1894 still made by national semiconductors it's a interesting chip for guitar use. and well used in the ibanez nb10

snmavronis · Post by **snmavronis** » 21 Mar 2012, 22:51

pedalgrinder wrote:where did the schematic go everytime i click on it it won't load just a small square with a red x and ns2 written in it. thanks

Here is a schematic link from the same site as the 2 photos above: http://obrazki.elektroda.net/47_1279571553.jpg

Syder · Post by **Syder** » 28 Mar 2012, 15:01

pedalgrinder wrote:https://www.freestompboxes.org/viewtopic ... 10#p174436

Here is the ibanez Noise Buster that for some reason goes under the radar. I could be wrong but the beauty of this unit is the ic does most of the work where from what i can tell the boss ns-2 seems to use a electronic attenuator then the circuit filters out via a side chain and triggers the electronic attenuator in a similar way to the ibanez noise buster. Rocklander has done a really good layout of this pedal i haven't had a chance to try yet but am looking forward to. He has done a really good job i take my hat off to him.

It doesn't has enough reviews and video demos out there.
I've readed some comments about it cutting highs as you get maximum noise reduction, so I don't really think I'd build it, but thanks for mention it.

StratWiz · Post by **StratWiz** » 18 Apr 2012, 18:24

My BOSS NS-2's output is lower than its input, and its tone is a bit dull (kind of more metallic and less natural) even when switched-OFF/bypassed. Otherwise it does great and works well.
Is that normal or common?
Are there any good known mods that can improve its output naturalness & level & switched-OFF/bypass' tone quality/naturalness?
Thanks,
SW

TubeOrgasmer · Post by **TubeOrgasmer** » 17 Aug 2013, 20:53

Well I've got an NS-2 which I put under my board for more space on the board, however I think it's a hassle to have to lift the board to turn it on on powerup. Is there a way to mod the Boss bypass flip-flop circuit for this one to be always on? So to say, disabling the possibility to turn it off altogether, as I never really do. Here's the schematic as I've found it:
http://obrazki.elektroda.net/47_1279571553.jpg

Thanks in advance!

astrobass · Post by **astrobass** » 17 Aug 2013, 21:24

Just bypass the switch altogether. I'm far from an expert and could be wrong but it seems like you could jumper junction 20 to 21?

grrrunge · Post by **grrrunge** » 17 Aug 2013, 22:08

Remove the switching JFETs and jumper the source -> drain pads for the JFETs that switch in the wet signal. As described here: http://www.geofex.com/Article_Folders/bosstech.pdf
Also someone over at TGP suggested this as a fix: http://www.thegearpage.net/board/showpo ... ostcount=9

TubeOrgasmer · Post by **TubeOrgasmer** » 19 Aug 2013, 09:42

grrrunge wrote:Remove the switching JFETs and jumper the source -> drain pads for the JFETs that switch in the wet signal. As described here: http://www.geofex.com/Article_Folders/bosstech.pdf
Also someone over at TGP suggested this as a fix: http://www.thegearpage.net/board/showpo ... ostcount=9

Aaah, I don't know how I didn't see this article on the boss switching before! That did it, I just "unbalanced" the flip-flop circuit and now it defaults to on. Thanks!

TubeOrgasmer · Post by **TubeOrgasmer** » 19 Aug 2013, 10:53

Actually that only did it with my Boss PSA which I use for testing, when it's on my board it still defaults to off. Strange.
Now I've tried finding the dry signal switch and the effects switch but it has come to my mind that the anatomy of the NS-2 is a bit different, seeing as the pedals in the loop are always connected through the signal path and the gate is just toggled on or off. So I've tried bypassing what I've thought to be the switching JFETs, Q6 and Q7, but now I don't get any of the gate effect at all. So I'm basically back to square one.

FluffChop · Post by **FluffChop** » 08 Jun 2015, 12:49

My NS-2 is set to mute, and when I power up the pedal it's in reduction mode. I never touch it at power on ever.

FluffChop · Post by **FluffChop** » 08 Jun 2015, 12:55

One thing I notice is that my guitar volume control can go lower than the minimum threshold setting. Thanks to whomever provided this schematic. Just a quick look and I see R24 need to be made smaller to make the threshold go lower (correct?). When I move house and get my little work bench back up I'll have a slash at changing this.

mon5454 · Post by **mon5454** » 08 Jul 2015, 05:23

Hi. I have a question. So, I got a non-working NS-2. When I opened it up, I saw that the protection diode is burned. I replaced the diode with a 1n4007 but I still can't get it to work. I also noticed that R1 has been replaced with a jumper (supposed to be 100k).

Also,I thought the ground of a circuit is connected to the sleeves of the jacks, and finally to the negative of the DC voltage. But when I performed continuity on the pin lug (negative) of DC in to the enclosure, it's not connected. I performed continuity on the negative lug of DC and to the anode of the protection diode there's no connection.
I don't have a camera so I got the image of the NS2 solder side from this thread and edited it a bit. The solder side of my NS-2 looks exactly the same as the image anyway. But can anyone have an idea why it's not working? I have yet to remove the jumper and put a 100k, but I just wanted to ask some experts.

Orange is for the pin lug of DC
Purple is the 100uF cap
Red is the protection diode
Green is R1 (100k)
The pink one is connected to the sleeve of input and thus to the enclosure too.

Fender3D · Post by **Fender3D** » 08 Jul 2015, 11:03

Usually experts smarter than me, substitute R1 with a jumper for the highest noise reduction...

mon5454 · Post by **mon5454** » 10 Jul 2015, 06:05

I see. I tried putting in an old 1n4007 but it didn't work after. So I put in a new one and the 100k for R1 and it worked. Maybe it's the old diode that's the problem. I'll try to put in the jumper.

Boss - NS-2 Noise Suppressor [schematic]