PCB Layout Process and Guidelines? - Page 8 - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State

Solid State Talk all about solid state amplification.

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 Search this Thread
Old 28th October 2012, 04:46 PM   #71
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
split power attachments as on Alex' is not the way to layout.
__________________
regards Andrew T.
  Reply With Quote
Old 28th October 2012, 04:46 PM   #72
alex mm is online now alex mm  Romania
diyAudio Member
 
alex mm's Avatar
 
Join Date: Mar 2006
Location: Baia Mare ,
jkuetemann ,
What can I say , your board it's fine , I have learned a lot, myself from this thread . The skill comme by every layout , so we can practice all time we have , dedicated to prepare PCB's. I like PCB's compact , all in one ,so my PCB look like this attached below.
Regards Alex.
Attached Images
File Type: jpg PCB ALL TOP GREY J.K..jpg (664.3 KB, 289 views)

Last edited by alex mm; 28th October 2012 at 05:05 PM.
  Reply With Quote
Old 28th October 2012, 07:11 PM   #73
diyAudio Member
 
jkuetemann's Avatar
 
Join Date: Dec 2010
Location: Paris, Ontario
Quote:
Originally Posted by AndrewT View Post
split power attachments as on Alex' is not the way to layout.
You disagree with power being delivered via the other side of the TO-3 flange? I wouldn't have thought it to have made much difference and eases the placement of MF decoupling, rail catching diodes and facilitates board testing prior to fitting the output transistors. I rather liked the approach. What is the issue? There are no long traces involved and essentially the power is still being delivered directly to the outputs.

Or did I miss something else in Alex's layout? It is fundamentally very similar to mine, but with his own signature flair.
__________________
---Jason Kuetemann---
When the student is ready, the master appears.
  Reply With Quote
Old 28th October 2012, 08:03 PM   #74
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
No, I disagree with the high loop area power connections. See the spacing of V+ & V- and PG.
Note also how these three wires span over the low level stages.
__________________
regards Andrew T.
  Reply With Quote
Old 28th October 2012, 08:14 PM   #75
diyAudio Member
 
jkuetemann's Avatar
 
Join Date: Dec 2010
Location: Paris, Ontario
I understand what you are suggesting now, not so much an issue on the PCB but rather the power delivery to the PCB. Fair enough. Like I said before this is an exercise in skill development.

So, here's a few changes. MF rail decoupling, diodes across the audio ground isolation resistor, some rerouting of traces and a few components moved. Still haven't decided where the place catching diodes just yet.

Thanks for the active discussion so far folks, it might not be pretty but I think I'm beginning to see the light.
Attached Images
File Type: jpg Generic Amp Layout v7.JPG (714.6 KB, 270 views)
__________________
---Jason Kuetemann---
When the student is ready, the master appears.
  Reply With Quote
Old 31st October 2012, 02:59 AM   #76
diyAudio Member
 
jkuetemann's Avatar
 
Join Date: Dec 2010
Location: Paris, Ontario
The 'Generic PSU' to compliment the 'Generic Amp'. Planning on the project being modular, Soft Start, PSU, Speaker Protect, et al as separate 'modules'.
Attached Images
File Type: jpg Generic PSUv2.JPG (697.5 KB, 211 views)
__________________
---Jason Kuetemann---
When the student is ready, the master appears.
  Reply With Quote
Old 31st October 2012, 02:08 PM   #77
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
The input fuses can't do much to improve safety.
]The high charge rates into the discharged capacitors require high value T rated fues.
These fuses then tolerate enormous overload currents.

Far better to close rate the transformer primary circuit fuse.
eg 200VA with 110/120Vac mains requires <=2A fuse to run the following 100W to 150W of maximum output power amplifier all day long at party volume levels.
I would experiment with T1.6A and T2A, to see just how low in fuse rating I could go, without incurring nuisance blowing.
__________________
regards Andrew T.
  Reply With Quote
Old 31st October 2012, 02:34 PM   #78
rsavas is offline rsavas  Canada
diyAudio Member
 
Join Date: Aug 2012
Location: Ontario
Default Power Supply for Audio Power Amplifier

Hi Jason,

I am basically doing a similar task as you are. I have designed a power amp using the LME49830 + LatFet, similar as was done by OPC (Owen). I managed to get a used transformer from a scraped Pioneer SX-1250 via eBay. I am merging two designs, the power supply section of the SX-1250 & the National Audio Power Amp Power Supply application note. I have done the Power Amp Recifier assembly & the PowerAmp assembly, so far and working on the attached PCB/schematic of the AC input assy. Still need to figure out the regulator for the LME49830, probably will just use a simple LM317/337, for that. Disregard the thin traces, as I just did a quick route last night, they will be beefed up with thick traces & copper pours. This gives me a chance to have people review what I am doing and get feedback as well. Hope that this is of some help to you. If you have any question, please ask.

Regards
Rick
Attached Files
File Type: pdf Layout.pdf (312.7 KB, 65 views)
File Type: pdf SCHEMATIC1 _ PAGE1.pdf (18.7 KB, 58 views)
  Reply With Quote
Old 31st October 2012, 04:41 PM   #79
diyAudio Member
 
Join Date: May 2011
Location: Ho Chi Minh city
What good result for tracks distance/spacing for voltage levels. I'm remember the UL-60950-1 standard say the tracks distance/spacing is 1mm for < 100V.
Correct me if i wrong!
  Reply With Quote
Old 30th December 2013, 02:00 PM   #80
diyAudio Member
 
jkuetemann's Avatar
 
Join Date: Dec 2010
Location: Paris, Ontario
I know this thread has been left for some time, but I have been continuing to evolve and want to put a PCB layout up for comment. This is a VSSA variant and in no way related to prior examples I have posted on this thread before.

I have tried to keep loops tight and local. Since my current plan is to have a board house produce the board I have elected to make use of both sides of the board. This allows for the use of PTH and more convenient routing. Where a change of layer was desired I used a component lead location for the purpose. I have tried to allow for generous clearances and keep silkscreen neat and off the pads.

Any constructive comments welcome, tell me what you do or do not like about it and why. Thanks.
Attached Images
File Type: jpg VSSAv2.JPG (743.3 KB, 137 views)
__________________
---Jason Kuetemann---
When the student is ready, the master appears.
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Eagle vs. Sprint-Layout for PCB design/layout hollowman Parts 11 12th January 2014 09:01 PM
About PCB layout gaetan8888 Solid State 14 11th January 2008 04:11 AM
PCB Manufacturing Process with Eagle PCB Algar_emi Parts 0 21st September 2007 01:07 AM
Amplifier PCB Layout Guidelines? ron.eddy Parts 19 18th December 2005 05:17 PM
PCB design guidelines mangrovejack Parts 3 10th July 2005 11:10 AM


New To Site? Need Help?

All times are GMT. The time now is 04:01 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2