Go Back   Home > Forums > >

D-Noizator: a magic active noise canceller to retrofit & upgrade any 317-based V.Reg.
D-Noizator: a magic active noise canceller to retrofit & upgrade any 317-based V.Reg.
Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools
Old 16th January 2021, 12:38 AM   #1961
wgh52 is offline wgh52  Germany
diyAudio Member
 
Join Date: Feb 2011
Location: Near Munich where the hops grows
Hi Folks,

I‘m following this Thread for a while now and am overwhelmed by the Expertise and Mountains of Development efforts!

I hope my question is acceptable: For my application, an old LM317/LM337 based Phono-Preamp supply, which I want to keep, I‘d like to try one of the noise reducers developed here. But which one do I take?

Thanks for your advice!
Winfried
__________________
Perception is reality
  Reply With Quote
Old 16th January 2021, 12:51 PM   #1962
Trileru is offline Trileru  Romania
diyAudio Member
 
Join Date: Dec 2010
Depends. Is the power supply on a separate board? If you have the +/- rails on a separate pcb you can replace it with a dienoiser type pcb, there's two dual version here, smd and tht.
If not then you could add an add-on pcb for each rail, but I'd try to make the complete supply if possible.
  Reply With Quote
Old 16th January 2021, 01:07 PM   #1963
Trileru is offline Trileru  Romania
diyAudio Member
 
Join Date: Dec 2010
I tried to make a discrete regulator using the dienoiser for ac feedback. Seems to simulate ok. PSRR at around 93-95dB at 100Hz, output impedance at 1-2mOhm and .noise sim shows around 1nV/√Hz. I made two versions, a 1A one and 100mA one. I'm not sure if I made the temperature sim correctly but shows around 300mV between 25 and 75 degrees C. Vout delta between few mA and full load is around 200mV for the 1A version and around 40mV for the 100mA version. The min voltage across the pass transistor for full performance seems around 3.8-4V. I could tweak the difference in output voltage between light and full load but I think there's a balance with the PSRR.
I used MJE15032 for the 1A version and BCP56 for the 100mA version. For the reference I used a LM329. I tried to pulse the load and seems stable.
Seems like it should work, and performance seems interesting for a discrete regulator. Did I miss anything or is there anything simple that could improve the performance? Would it work in practice?
Attached Images
File Type: png Screenshot from 2021-01-16 15-06-49.png (31.0 KB, 249 views)
Attached Files
File Type: asc discrete.asc (9.4 KB, 5 views)
  Reply With Quote
Old 16th January 2021, 01:48 PM   #1964
wgh52 is offline wgh52  Germany
diyAudio Member
 
Join Date: Feb 2011
Location: Near Munich where the hops grows
Quote:
Originally Posted by Trileru View Post
Depends. Is the power supply on a separate board? If you have the +/- rails on a separate pcb you can replace it with a dienoiser type pcb, there's two dual version here, smd and tht.
If not then you could add an add-on pcb for each rail, but I'd try to make the complete supply if possible.
Hello and thanks for the initial answer!

We are talking about retrofitting an existing, space limited, purchased power supply. Available space for an add-on is about 5x3x3cm. The 317/337 board (both on one PCB) shall remain, as it fits the case. I plan to piggy-back a known, well working noise reduction circuitry and do not plan to experiment or optimise beyond maybe tuning a potentiometer (as my expertise does not seem suffice beyond that... ).


D-Noizator: a magic active noise canceller to retrofit & upgrade any 317-based V.Reg.-denoiser1-jpg


So I would be very thankful if I would be pointed to the posting(s) with the appropriate ciruitry, schematic or PCB, so I can take it on from there.

Thanks and Regards,
Winfried
Attached Images
File Type: jpg DeNoiser1.jpg (75.0 KB, 301 views)
__________________
Perception is reality
  Reply With Quote
Old 16th January 2021, 02:57 PM   #1965
Trileru is offline Trileru  Romania
diyAudio Member
 
Join Date: Dec 2010
You could try the board in this post, I've tested it and it's working:
D-Noizator: a magic active noise canceller to retrofit & upgrade any 317-based V.Reg.
It's 43mm x 20mm. If you think you can solder the sot-23 parts there's a smd version as well.
  Reply With Quote
Old 16th January 2021, 04:37 PM   #1966
wgh52 is offline wgh52  Germany
diyAudio Member
 
Join Date: Feb 2011
Location: Near Munich where the hops grows
Thanks!

I'll have a look at the KiCAD project (got the S/W but only rudimentary experience with KiCAD...) and see what it tells me. Would boards be available for purchase at all? I'd just need two of the THT boards, as I have two of the power supplies.

Regards,
Winfried
__________________
Perception is reality
  Reply With Quote
Old 16th January 2021, 05:36 PM   #1967
Trileru is offline Trileru  Romania
diyAudio Member
 
Join Date: Dec 2010
I diyed mine. You can get them made pretty cheap at fab houses like jlcpcb or others similar. The gerber files for that should be included in the zip file.
  Reply With Quote
Old 16th January 2021, 05:46 PM   #1968
Trileru is offline Trileru  Romania
diyAudio Member
 
Join Date: Dec 2010
I think I can make the discrete regulator with even more accessible/cheaper parts. I could replace the voltage reference with Walt Jung's GLED431 setup using a resistor/transistor/led.
I might make a diy board to test it.
Attached Images
File Type: png Screenshot from 2021-01-16 19-42-59.png (32.9 KB, 220 views)
  Reply With Quote
Old 18th January 2021, 10:02 AM   #1969
carlmart is offline carlmart  Brazil
diyAudio Member
 
Join Date: Mar 2001
Location: Brazil
Can you upload the asc file for the later?
  Reply With Quote
Old 18th January 2021, 03:00 PM   #1970
Trileru is offline Trileru  Romania
diyAudio Member
 
Join Date: Dec 2010
I have since improved it a bit. I used a cross between the nonoiser and dienoiser. I have also used some random led model I found, seems to perform worse than the ones in the library but seems to be having a closer Vdrop to the normal tht leds I have around.
Noise sim shows around 0.62nV/√Hz, PSRR around 120dB, and output impedance also dropped to around 0.5mOhm.
PSRR can be a bit higher with a LM329, or maybe a proper LED model. For the sim I used BD139 as pass transistor, I think it's a Bob Cordell model, around 100mA.
I tried to keep around 5mA going through the leds. To me the currents seem optimal, through the other components.
There's a delta of around 160mV between 25 and 75 degrees C for temperature sim.
Stepping the load between 10mA and 100mA there's a delta of around 120mV.
I guess figures could be improved a bit. I was in the middle of playing with the sim now. I pulsed the load and seems to recover nicely. I don't know if it needs compensation or ferrite bead like the NoNoiser.
I made a diy pcb of the previous version but I will do one for this version as well, seems like it should perform good. Considering the performance and price of components I think it's interesting.
Attached Images
File Type: png Screenshot from 2021-01-18 16-59-49.png (25.9 KB, 170 views)
Attached Files
File Type: asc discrete_n.asc (6.0 KB, 11 views)
  Reply With Quote

Reply


D-Noizator: a magic active noise canceller to retrofit & upgrade any 317-based V.Reg.Hide this!Advertise here!
Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
PSU upgrade for DAC Magic Plus E30NA Digital Line Level 8 1st October 2014 01:00 PM
Higher-harmonic distortion canceller jkeny Solid State 0 30th January 2009 12:39 AM
LM3886 based Amp -Upgrade advice please. mikesnowdon Chip Amps 3 26th October 2008 01:53 PM
Active crossover - Voodoo magic? ShinOBIWAN Multi-Way 5 24th February 2005 03:34 AM


New To Site? Need Help?

All times are GMT. The time now is 05:02 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2021 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2021 DragonByte Technologies Ltd.
Copyright ©1999-2021 diyAudio
Wiki