Go Back   Home > Forums > >

Dual mono PSU.
Dual mono PSU.
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 26th November 2020, 01:24 PM   #1
Sebastiaanm is offline Sebastiaanm  Belgium
diyAudio Member
 
Join Date: Dec 2019
Location: limburg
Default Dual mono PSU.

I have 2 toroids 120va 35v (amplimo) which i wanna use to power my ljm 2-12 boards. I don't need the full power of this amp.
I made a pcb layout with autocad for grinding a pcb.

1 toroid will power 1 amp board.

Pcb:
2 fuses (1 per rail)
4 schottky diodes to-220
2 led (1 per rail)
4 capacitors 4700uF 63v. (Nichicon audio grade for the looks)
2 capacitors 1uF with resistor 1R 3W.

Is this design any good for my application?
Should i add or change anything?
Attached Images
File Type: jpg 3D voeding.jpg (117.4 KB, 290 views)
File Type: jpg 20201125_175312.jpg (575.8 KB, 289 views)
  Reply With Quote
Old 26th November 2020, 01:54 PM   #2
Ketje is offline Ketje  Belgium
diyAudio Member
 
Ketje's Avatar
 
Join Date: Dec 2012
Location: Flanders
No, it's not good.From the rectifiers to the capacitors and then from the capacitors to the users.
Not tapping the user connection somewhere in between rectifier and capacitor.
And that goes for positive, negative and ground.
Mona
  Reply With Quote
Old 26th November 2020, 09:37 PM   #3
Sebastiaanm is offline Sebastiaanm  Belgium
diyAudio Member
 
Join Date: Dec 2019
Location: limburg
Oh, is it so much difference with so short connections then?
If i make the circuit, (diode-cap-user), it wil be ok ?
I can't see the difference. Only much longer tracks.
  Reply With Quote
Old 26th November 2020, 10:12 PM   #4
Sebastiaanm is offline Sebastiaanm  Belgium
diyAudio Member
 
Join Date: Dec 2019
Location: limburg
Ok, it's no problem to make the circuit like this.
First capacitors and then de load.
The traces will be longer because i can't change the shape of the pcb because of the case it has to fit in..

But i don't see the difference?
Everything is connected with short tracks and a minimum of resistance of these tracks? The caps are still connnected.
Does it make a difference to go first to the cap and then to the load or not. If i do that the traces will be longer.
  Reply With Quote
Old 27th November 2020, 03:33 AM   #5
trobbins is offline trobbins  Australia
diyAudio Member
 
trobbins's Avatar
 
Join Date: Feb 2009
Location: Melbourne, Oz
If you are just making the pcb to show off some expensive capacitors then don't let us stop you, but firstly check which way the writing is on the big caps and orient the pcb pads so you see the writing (rather than it be hidden) !

If you are aiming to reduce hum and noise levels that pass from the rectification process and in to your amplifier then you need to do some homework on power supplies, and electronics, and revisit your pcb design once you have better appreciated what Ketje has posted.
  Reply With Quote
Old 27th November 2020, 05:34 AM   #6
Sebastiaanm is offline Sebastiaanm  Belgium
diyAudio Member
 
Join Date: Dec 2019
Location: limburg
I'm here to learn!
I want a good sounding amp with a good rectifier board.
And i want to make it look good inside the amp.
That's why i want to know what the difference is if to put de caps between the load and rectifier. Or the way i made the pcb.

I can change everything because i haven't ordered anything yet for the rectifier board.
  Reply With Quote
Old 27th November 2020, 06:27 AM   #7
Sebastiaanm is offline Sebastiaanm  Belgium
diyAudio Member
 
Join Date: Dec 2019
Location: limburg
It's a good tip to order the caps so i can position them the best looking way.
Is my choice of components good?

I quickly changed the plan a bit. Is this a better layout?
Attached Images
File Type: jpg 20201127_072158.jpg (521.5 KB, 229 views)
  Reply With Quote
Old 28th November 2020, 04:11 AM   #8
trobbins is offline trobbins  Australia
diyAudio Member
 
trobbins's Avatar
 
Join Date: Feb 2009
Location: Melbourne, Oz
One aspect worth looking at is to snubber the power transformer secondary windings to constrain transient leakage inductance energy to as close to the winding as possible. You may find it worthwhile looking through the Quasimodo threads, and testing your transformer first.
  Reply With Quote
Old 28th November 2020, 08:11 AM   #9
Sebastiaanm is offline Sebastiaanm  Belgium
diyAudio Member
 
Join Date: Dec 2019
Location: limburg
I do some homework and order the caps.
  Reply With Quote
Old 1st December 2020, 06:11 PM   #10
Sebastiaanm is offline Sebastiaanm  Belgium
diyAudio Member
 
Join Date: Dec 2019
Location: limburg
I read a lot of snubbers and add a snubber circuit over the outer taps of the secondairy because there's not much space on the pcb, i learned this should work. I choose the values after measurements.
I also changed the layout of the board. Hope i didn't oversee anything.
Attached Images
File Type: jpg 20201201_172648.jpg (545.8 KB, 140 views)
File Type: jpg 20201201_172658.jpg (455.2 KB, 135 views)
  Reply With Quote

Reply


Dual mono PSU.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
grounding dual mono to mimick a mono block mozarti Chip Amps 5 27th November 2014 10:07 AM
Grounding for dual mono PSU and digital PSU smithomo Power Supplies 4 23rd July 2013 09:53 AM
making dual mono jack from single mono jack dubmunkey Analog Line Level 2 12th October 2006 03:16 PM
Single Mono's or Dual Mono? Tazzy Pass Labs 8 3rd October 2002 03:03 PM
Dual Mono - Anti Mono Power Supplies pmkap Everything Else 3 16th February 2002 06:10 AM


New To Site? Need Help?

All times are GMT. The time now is 02:58 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2021 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 14.29%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2021 DragonByte Technologies Ltd.
Copyright ©1999-2021 diyAudio
Wiki