At some point I'm gonna have to make an official press statement if these mix-ups keep on happening
. The relevant Volker is @[silent:arts]. But nice work 
.
Neumann W492 equalizer DIY project (PCB docs added)
- Thread starter audiox
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Help Support GroupDIY Audio Forum:
. The relevant Volker is @[silent:arts]. But nice work .
macleod69
Member
- Joined
- Oct 16, 2017
- Messages
- 17
Nice build!
I also took 2 w492 pcbs from proaudiogc. Can't wait to do this project!
the link: https://proaudiogc.com/en/w492-eq-clone-neumann-pcb-only-equalizer-4-bands
Hello,
i bought a W492 DIY Build from a friend for cheap. Unfortunately there is some issue with it. After turning the pots i get a really loud noise/click (almost like a kick) out of both sides. I have nothing on the input. Has anyone maybe an idea where to look first or similar experience? PSU for example or Calibrate the Gains/EQs?
Best regards!
i bought a W492 DIY Build from a friend for cheap. Unfortunately there is some issue with it. After turning the pots i get a really loud noise/click (almost like a kick) out of both sides. I have nothing on the input. Has anyone maybe an idea where to look first or similar experience? PSU for example or Calibrate the Gains/EQs?
Best regards!
janczmok
Well-known member
Also got my parts together, and started wiring today. Still parts missing (PSU, knobs) but frontpanel.de made a wonderful work on the panel.
lilpaula87
New member
- Joined
- Jan 5, 2021
- Messages
- 4
Hi Everybody, I need some help. I've built this gear but mine needs to be fed with a really low signal because it overdrives really soon. Moreover I've experienced a huge HF noise starting from 1000khz to 20000khz and up. Both channels act the same. Is this a normal behaviour?
TwentyTrees
Well-known member
That doesn't sound normal to me, but let's check a few things to see if we can narrow it down. Which PCBs are you using, and how do you have the unit connected - line in/out on audio interface, etc? Balanced I/O?
How low is low? As in, what level dBu are you feeding in, and what level are you getting out assuming all controls are flat? What THD are you measuring? I use the free Room EQ Wizard (REW) software for things like that.
That doesn't sound right, but again, what levels are you seeing for the noise? How are you powering your unit? If you can share some photos too, that might help.
janczmok
Well-known member
Update. Covered caps. Not 100% happy, still looking for better ones. If somebody has an idea...
let’s try to work something out with a set of mine. If you want,
For people building Creative Clowns style, my slow pace allowed me to incorporate this new bypass kit into mine.
One thing, it collocates the ins and outs, so your rear panel labels could be affected.
https://www.creative-clowns.com/product-page/stereo-true-bypass-pcb-kit
One thing, it collocates the ins and outs, so your rear panel labels could be affected.
https://www.creative-clowns.com/product-page/stereo-true-bypass-pcb-kit
Mine are black 11mm Selco/Sifam S111 collet knobs with C111 colored caps, but your shafts look like a bigger diameter than mine, and the biggest collet they make for those is for 4mm shafts. The frequency select pots I used are 4mm shaft Omeg’s discussed way back in this thread, and for the gain pots I used 1/8” shaft center detent that CAPI sells.
I built mine 7+ years ago; it was the first project I built from this site, simultaneously with the Gyraf G9!
If you are looking for knobs then you might like https://www.etsy.com/shop/SwedenKnobs
lilpaula87
New member
- Joined
- Jan 5, 2021
- Messages
- 4
Hi TwentyTrees, thanks for your reply.
For psu and eq I’ve used are Creative Clowns’ PCBs.
The unit is connected via Behringer ultragain to my RME Fireface 802. Inputs and outputs are balanced.
It sound already distorted to my ears at low levels but I’ve tried to feed in a 0Db sine wave at 1khz measured at input (0,775v ac) and this is what I get.
Tha converter is not clipping at all and the level is -14db.
I get the same wave with all bands engaged at 0 gain or with without engaging any band. I have no true bypass on the unit.
I have to lower input to 0.483v to have a good waveform.
This force me to push the volume gain on return but this brings up all the noise and this is what I have
The noise is not caused by Ultragain. Even if I connect the unit directly to RME the result is the same.
As for Toroid, I’m using the suggested Triad.
Here are som pics of my unit
Any suggestion would be greatly appreciated
Hi TwentyTrees, thanks for your reply.
For psu and eq I’ve used are Creative Clowns’ PCBs.
The unit is connected via Behringer ultragain to my RME Fireface 802. Inputs and outputs are balanced.
It sound already distorted to my ears at low levels but I’ve tried to feed in a 0Db sine wave at 1khz measured at input (0,775v ac) and this is what I get.
View attachment 137002
Tha converter is not clipping at all and the level is -14db.
I get the same wave with all bands engaged at 0 gain or with without engaging any band. I have no true bypass on the unit.
I have to lower input to 0.483v to have a good waveform.
This force me to push the volume gain on return but this brings up all the noise and this is what I have
View attachment 137004
The noise is not caused by Ultragain. Even if I connect the unit directly to RME the result is the same.
As for Toroid, I’m using the suggested Triad.
Here are som pics of my unit
View attachment 137005
View attachment 137006
View attachment 137007
Any suggestion would be greatly appreciated
I´m building this EQ my self and noticed some things on your PCB , Resistor R51,R52 are mislabeled on your board, The correct value is 22R and I know that PT1 also is mislabeled and has the wrong value should be 200R but I think it says 10K on the board.
Plus double check the voltage in to your PCB so you have 15v+-
And I also noticed that C13 on the board looks a little melted. maybe nothing to worry about.
I hope you get it working.
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