My_Ref Fremen Edition - need help on PCB evaluation - Page 13 - diyAudio
Go Back   Home > Forums > Amplifiers > Chip Amps

Chip Amps Amplifiers based on integrated circuits

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 4th December 2011, 10:33 AM   #121
soongsc is offline soongsc  Taiwan
diyAudio Member
 
soongsc's Avatar
 
Join Date: Mar 2005
Location: Taiwan
I was also wondering whether it's worth allowing for a larger C13 on board.
__________________
Hear the real thing!
  Reply With Quote
Old 4th December 2011, 11:33 AM   #122
Reality first!
diyAudio Member
 
ClaveFremen's Avatar
 
Join Date: May 2005
Location: Milan, Italy
Quote:
Originally Posted by soongsc View Post
Looks great. FYI the TP Rev C board is a good example of smooth routing. I just opened up my ref C to do the compensation mod you PMed me.
Thanks

Yes, TP PCB are a good example but with groundplanes you must pay more attention if you want to use microstrips, gently mitered traces with 45 bends mantains constant impedance better...

Let me know what do you think of the alternate compensation.

Quote:
Originally Posted by madisonears View Post
Looks like you have already got a good grasp of this software, and I'm impressed.
Thanks, Tom

Quote:
Originally Posted by madisonears View Post
The design is looking really good for ease of building because it is much less cluttered than your previous attempts.
Yes, I agree...BTW the 100x80 version it's not so cluttered in my opionion

I've attached some render of it.

Quote:
Originally Posted by madisonears View Post
Now that the board is bigger, is there room enough to lay the resistors near the regulators down instead of standing them upright?
Sure, it can... see the attached detail.

But traces are longer and a litlle slot is made to the ground plane, any opinion on it?

Quote:
Originally Posted by madisonears View Post
Can you make a little more room around the 318? It looks pretty tight for the caps nearby.
This is more difficult, giving more space between caps would lead to longer traces where lenght is most critical.

BTW I've chosen caps that are big enough to accomodate a quite large set of alternatives.

Quote:
Originally Posted by madisonears View Post
Perhaps some of the traces with large radius should be straightened again to make the path shorter. I'm not sure what is really gained by using such large curves, but I think a shorter path is always better. Other than extra length, I do like curves.
Can you be more precise? Exactly, to which traces are you referring to?

Quote:
Originally Posted by soongsc View Post
I was also wondering whether it's worth allowing for a larger C13 on board.
When I've started designing the larger board it was one of my goals but the Zn, or similar caps, are way too big to be placed on that board... the Hobbyst Edition allows 100x160 PCBs, unless people is willing to pay me the upgrade to the Professional Edition (840€)...

See the attachment.

Jokes apart it would require enlarging the PCB 2cm more with added cost in production, I would consider it if the PCB should be enlarged for additional circuits, like a second current pump...

But that's a whole new story... The PS would need to be redesigned.
Attached Images
File Type: jpg My_Ref_FE Top.jpg (263.1 KB, 200 views)
File Type: jpg My_Ref_FE Bottom.jpg (240.9 KB, 195 views)
File Type: png Immagine.png (184.4 KB, 184 views)
File Type: jpg Immagine2.jpg (93.5 KB, 174 views)
__________________
Dario
ClaveFremen "Bailando Salsa en el Sietch"

Last edited by ClaveFremen; 4th December 2011 at 11:40 AM.
  Reply With Quote
Old 4th December 2011, 01:23 PM   #123
soongsc is offline soongsc  Taiwan
diyAudio Member
 
soongsc's Avatar
 
Join Date: Mar 2005
Location: Taiwan
With my normal practice, I changed only one channel first. Initial impression is that the sound is not as dynamic. It is dryer. I will measure it some time in the next few days to compare the channels and see how they differ. My instinct is the phase is either going to lag a bit more at the high frequency or we might see some ringing at the top end. I will post more in the other thread. My speaker impedance is probably flat around 6Ohm if I remember correctly.

100x160, the cap will not fit if you make the board longer?
__________________
Hear the real thing!

Last edited by soongsc; 4th December 2011 at 01:27 PM.
  Reply With Quote
Old 4th December 2011, 05:23 PM   #124
Reality first!
diyAudio Member
 
ClaveFremen's Avatar
 
Join Date: May 2005
Location: Milan, Italy
Quote:
Originally Posted by soongsc View Post
With my normal practice, I changed only one channel first. Initial impression is that the sound is not as dynamic. It is dryer. I will measure it some time in the next few days to compare the channels and see how they differ. My instinct is the phase is either going to lag a bit more at the high frequency or we might see some ringing at the top end. I will post more in the other thread. My speaker impedance is probably flat around 6Ohm if I remember correctly.
I'm curious to see your measurements...

Quote:
Originally Posted by soongsc View Post
100x160, the cap will not fit if you make the board longer?
Sure, I thought I've already stated it:

Quote:
Originally Posted by ClaveFremen View Post
Jokes apart it would require enlarging the PCB 2cm more with added cost in production, I would consider it if the PCB should be enlarged for additional circuits, like a second current pump...
__________________
Dario
ClaveFremen "Bailando Salsa en el Sietch"
  Reply With Quote
Old 11th December 2011, 04:08 AM   #125
Reality first!
diyAudio Member
 
ClaveFremen's Avatar
 
Join Date: May 2005
Location: Milan, Italy
Default Beta testers needed

After last mods:

  • space on-board for C13
  • optional SMD caps for AC input

I think the PCB is ready for the prototype testing.

To keep costs reasonable and to have some real feedback I need 5 braves that will share the beta test with me (total 6 kits).

It would be nice if at least one or two partecipants have the knowledge/possibility to make some measurements (THD, stability, etc.).

Each beta tester will receive two blue 100x110mm PCBs (2mm FR4, 2Oz/70u) at 29€ (ca 39 US$) and possibly a partial kit (SMD parts + Elna RJHs+Wima FKS2s) at a price yet to be determined.

While I'm confident that the amps will work as intended from the start who choose to partecipate must be aware that it's possible that the amps may have problems or even don't work at all.

The price is for untested PCBs, if we want the electric test price is 37€

If the packet is less than 350g, shipping by Registered Mail will be:

Europe 9.50€
Worldwide (except Oceania) 12.50€

Tomorrow I'll post the BOM.
Attached Images
File Type: jpg My_Ref_FE - PCB.jpg (376.3 KB, 140 views)
File Type: jpg My_Ref_FE_TOP.jpg (138.0 KB, 66 views)
File Type: jpg My_Ref_FE_BOTTOM.jpg (94.3 KB, 60 views)
__________________
Dario
ClaveFremen "Bailando Salsa en el Sietch"

Last edited by ClaveFremen; 11th December 2011 at 04:18 AM.
  Reply With Quote
Old 11th December 2011, 07:46 AM   #126
diyAudio Member
 
Join Date: Oct 2008
Dario, I think your PCB looks great, I'm following this thread since the beginning, and I will, if PCB ends in group buy definitely build some. For the verification phase I think I don't have enough experience for troubleshooting or measurements.

I have a question regarding the PCB itself, I don't see that PCB is using any terminal blocks or terminal lugs for connecting AC wires to board ? Any special reason for that? sometimes its easyer to work with wires if you can disconnect them without desoldering.

Keep up the good work.
  Reply With Quote
Old 11th December 2011, 10:30 AM   #127
soongsc is offline soongsc  Taiwan
diyAudio Member
 
soongsc's Avatar
 
Join Date: Mar 2005
Location: Taiwan
Seems interesting. If you can take PayPal, I'd try a set.
__________________
Hear the real thing!

Last edited by soongsc; 11th December 2011 at 10:33 AM.
  Reply With Quote
Old 11th December 2011, 10:36 AM   #128
soongsc is offline soongsc  Taiwan
diyAudio Member
 
soongsc's Avatar
 
Join Date: Mar 2005
Location: Taiwan
Quote:
Originally Posted by maximm07 View Post
...

I have a question regarding the PCB itself, I don't see that PCB is using any terminal blocks or terminal lugs for connecting AC wires to board ? Any special reason for that? sometimes its easyer to work with wires if you can disconnect them without desoldering.

Keep up the good work.
Aren't those between the rectifiers?
__________________
Hear the real thing!
  Reply With Quote
Old 11th December 2011, 11:55 AM   #129
diyAudio Member
 
Join Date: Oct 2008
i wasnt looking close enough and they are not visible on 3d randerings.
  Reply With Quote
Old 11th December 2011, 01:52 PM   #130
Reality first!
diyAudio Member
 
ClaveFremen's Avatar
 
Join Date: May 2005
Location: Milan, Italy
Quote:
Originally Posted by maximm07 View Post
Dario, I think your PCB looks great, I'm following this thread since the beginning,
...
I have a question regarding the PCB itself, I don't see that PCB is using any terminal blocks or terminal lugs for connecting AC wires to board ?
...
Keep up the good work.
Thanks Maxim

As Soongsc already noted there are both fast-on and cable connection for each AC input and speaker output.

Also signal input and led output are designed for Molex connectors.

Quote:
Originally Posted by soongsc View Post
Seems interesting. If you can take PayPal, I'd try a set.
Great Soongsc!

So at the moment:

  1. Me
  2. Soongsc
  3. .
  4. .
  5. .
  6. .
The minimum number for firing things up is 2 patecipants apart me (total 3) at 44 for the two boards (w/o electric test).

In this moment I'm doing the last tests (LM3886 ground to GND and optional caps for AC input) and preparing the BOM.
__________________
Dario
ClaveFremen "Bailando Salsa en el Sietch"
  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
MY_REF technical description mauropenasa Chip Amps 10 8th December 2013 04:56 PM
Hx-Home Edition and Hx Mini Edition will be released December, 24th destroyer X Solid State 54 3rd September 2012 03:44 PM
My_Ref RevO ClaveFremen Chip Amps 52 22nd September 2011 06:07 PM
ARC Power source+Marantz 7C(PCB edition) gxcnabin Tubes / Valves 35 16th April 2011 05:01 AM
WTB My_Ref Rev C nvrgdenuf Swap Meet 2 29th January 2010 07:37 PM


New To Site? Need Help?

All times are GMT. The time now is 02:57 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