Rod Elliot P3A Layout - Critics - 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 29th November 2011, 02:35 PM   #1
diyAudio Member
 
Join Date: Oct 2010
Default Rod Elliot P3A Layout - Critics

Hi all,
I'm new to this thread...!
This is my 1st amplifier layout. I've been working with small layouts earlier.But this one seems to be a BOMB!
Any Suggestions related to placement of components welcome!

Thanks and Regards

Mark
Attached Images
File Type: jpg P3A Layout.jpg (128.7 KB, 3657 views)
  Reply With Quote
Old 29th November 2011, 03:06 PM   #2
Alfonz is offline Alfonz  Bulgaria
diyAudio Member
 
Join Date: Jul 2008
1. Rotate R5 clockwise and get input part closer.
2. Put C+ and C- to the bottom of the PCB, it's necessary to have shorter track as possible.
3. Separate input GND from main GND (get a GND for input from filter caps).
4. You can rotate Q5 180 degrees clockwise, because Q5 doesn't need of any heatsink. U can rotate Q4 also.
5. The + - tracks must be bigger.

BTW is that Sprint Layout file?
  Reply With Quote
Old 29th November 2011, 03:18 PM   #3
diyAudio Member
 
Join Date: Oct 2010
Thank you!
This is an ExpressPCB file...I took the screen shot.
I like the pads of Cadsoft Eagle but don't know to use it
I don't like the pads of ExpressPCB but I know to use it....!

To make the component pad area bigger, I made rectangles around it!!

Regards
  Reply With Quote
Old 29th November 2011, 05:20 PM   #4
Alfonz is offline Alfonz  Bulgaria
diyAudio Member
 
Join Date: Jul 2008
You can try Sprint Layout - got better adjustments and component library.
Great for beginners!

Or search in forum, there's a lot of treads about the legendary P3a.
  Reply With Quote
Old 30th November 2011, 07:03 AM   #5
diyAudio Member
 
Join Date: Oct 2010
I'm downloading sprint layout now and will let u know how it is Thanks for the suggestion.
I din't understand what to do with the ground. Can you please elaborate?
I've attached the edited layout.

Regards
Attached Images
File Type: jpg P3A Layout-2.jpg (132.8 KB, 3320 views)
  Reply With Quote
Old 30th November 2011, 08:00 AM   #6
diyAudio Member
 
east electronics's Avatar
 
Join Date: Jan 2006
Location: Athens GREECE
never post a lay out when its fresh made ... look at it again and again use the advice given ( except the ground issue ) and work on the concept ...

you will find a million other ways to make it better looking and better working

read the forum also .... there is loads of advice on people that tried before you and also there is a lot of advice given to correct the mistakes ..

your pcb will work but its very generic it has a number of things to be corrected
__________________
SERVICE ΕΝΙΣΧΥΤΩΝ ΚΑΙ ΙΑΠΩΝΙΚΩΝ ΜΗΧΑΝΗΜΑΤΩΝ ΗΧΟΥ www.eastelectronics.gr
  Reply With Quote
Old 30th November 2011, 08:10 AM   #7
kalmara is offline kalmara  Bulgaria
diyAudio Member
 
kalmara's Avatar
 
Join Date: Dec 2005
Location: Vratza, Bulgaria
I doubt his pcb will work, has to do at least 10 more revisions.

p.s. Where's the Q6 collector connected to again?
__________________
Insane HONDA FAN !!! Variable Valve Timing and Lift Electronic Control equals....HIGH ADRENALINE !
  Reply With Quote
Old 30th November 2011, 08:39 AM   #8
diyAudio Member
 
east electronics's Avatar
 
Join Date: Jan 2006
Location: Athens GREECE
kalmara is correct
__________________
SERVICE ΕΝΙΣΧΥΤΩΝ ΚΑΙ ΙΑΠΩΝΙΚΩΝ ΜΗΧΑΝΗΜΑΤΩΝ ΗΧΟΥ www.eastelectronics.gr
  Reply With Quote
Old 30th November 2011, 11:55 AM   #9
diyAudio Member
 
Join Date: Apr 2011
Location: Pretoria
Here is the original circuit, for those who are trying to work it all out:

60-80W Power Amplifier

Q9 should line up with Q7 and Q8 because thay all need to be on the same heatsink.

Last edited by ingenieus; 30th November 2011 at 12:00 PM.
  Reply With Quote
Old 30th November 2011, 12:14 PM   #10
diyAudio Member
 
Join Date: Oct 2010
Thank you for your suggestions everybody, I've tried to edit the layout according to Alfonz's suggestions. Hope its better this time!

@sakis - what happens if the layout isn't up to the mark? Will it cause oscillations in the amp??
@kalmara - thank you for letting me know that! That was just something that cannot be avoided! And was out of carelessness.
@ingenius - Is it really necessary to keep them in a line? I was thinking of using U shaped heatsinks used for TO-220s

I've attached the edited layout.

Thanks and Regards
Attached Images
File Type: jpg P3A Layout-3.jpg (132.4 KB, 2996 views)
  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
Rod Elliot P.68 Phase? samutacaratti Solid State 17 28th July 2013 02:53 AM
Rod Elliot P37? roger-k Solid State 21 7th October 2006 07:37 PM
Rod Elliot P3a boards stuffed FS! Mattyo5 Swap Meet 8 3rd October 2006 01:45 PM
Rod Elliot P3A amp noises tktran Solid State 2 18th March 2003 07:04 PM
Rod Elliot 100W PCB Layout bugbite2k Solid State 5 30th January 2002 05:32 PM


New To Site? Need Help?

All times are GMT. The time now is 07:50 PM.


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