New Aleph Mini PCB GB - Page 42 - diyAudio
Go Back   Home > Forums > Amplifiers > Pass Labs

Pass Labs This forum is dedicated to Pass Labs discussion.

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 5th April 2005, 11:23 AM   #411
BrianGT is offline BrianGT  United States
diyAudio Moderator Emeritus
 
BrianGT's Avatar
 
Join Date: Jan 2002
Location: near Atlanta, GA
Send a message via AIM to BrianGT
I also did a 6 capacitor version of the revised board, but I was concerned that it would be too large for some chassis designs.

--
Brian
Attached Images
File Type: gif ps1a.gif (96.3 KB, 970 views)
  Reply With Quote
Old 5th April 2005, 12:03 PM   #412
BrianGT is offline BrianGT  United States
diyAudio Moderator Emeritus
 
BrianGT's Avatar
 
Join Date: Jan 2002
Location: near Atlanta, GA
Send a message via AIM to BrianGT
Quote:
Originally posted by Jean
I like this new revision of the power supply board also. My only suggestions would be, maybe allow the board to use to220 style resistors with same heatsinks as the diodes ? maybe 2 per rail ?
I could easily fit room for 1 heatsinked to-220 resistor per rail. Caddock MP930 resistors are rated at 30w when heatsinked, which is twice the rating than the 5 - 3w resistors in parallel.

I would still stick to 5 - 3w resistors, as I feel more comfortable having 5 components in parallel.

--
Brian
Attached Images
File Type: gif res-hs.gif (26.9 KB, 915 views)
  Reply With Quote
Old 5th April 2005, 12:18 PM   #413
BrianGT is offline BrianGT  United States
diyAudio Moderator Emeritus
 
BrianGT's Avatar
 
Join Date: Jan 2002
Location: near Atlanta, GA
Send a message via AIM to BrianGT
Quote:
Originally posted by Coulomb
I like the new board Brian, the larger caps are a nice option. The problem is for people who perscribe to the theory that smaller caps have less ESR and react to current fluctuations faster then large caps, they can no only put four caps on the board.

Is there a way you could put both footprints on the same board, 6 smaller caps or 4 larger ones? That way the user can populate the boards to his or her liking. If you juggle the real estate with enough finesse I am sure you could come up with some workable gemoetry.

Regards

Anthony
The larger capacitors have a lower individual ESR than the smaller capacitors, so there is no advantage in terms of ESR using 6 TS-UP capacitors vs. 4 T-HA capacitors.

For the caps that I have here now:
10,000uF 50v TS-UP 35mm x 30mm
ESR @ 120hz = 0.036 ESR @ 20khz = 0.027

For an equivilant capacitance bank:
15,000uF 50v T-HA 35mm x 50mm
ESR @ 120hz = 0.022 ESR @ 20khz = 0.018

Run the numbers for the capacitor bank and you will see that the larger caps will allow for the same, if not lower ESR, since ESR is also a function of the capacitor size.

If you want to go for a significantly lower ESR bank, try paralleling a bunch of smaller Panasonic FC capacitors, but I feel that this is beyond the scope of this project.

Panasonic T-HA datasheet:
http://www.panasonic.com/industrial/...series_dne.pdf
Panasonic TS-UP datasheet:
http://www.panasonic.com/industrial/...series_dne.pdf

--
Brian
  Reply With Quote
Old 5th April 2005, 12:45 PM   #414
diyAudio Member
 
Join Date: Sep 2001
Location: Salt Lake City
I like the board above. I have used 120,000 mfd Panasonic T-HA caps in the mini that I use at home with fantastic results. On this version of the board one could have 360,000 mfd per rail for a mini running +\- 15 volts. Now thats alot of total capacitance which will also have very low ESR!! I can vouch that just 1 pair of these caps in a mini sounds amazingly good, now thing three pair..... .

Mark
  Reply With Quote
Old 5th April 2005, 12:47 PM   #415
diyAudio Member
 
Join Date: Dec 2002
Location: dry ol Melbourne Australia
Readsy to pay, I went looking to check if prices are USD or $C, but couldnít find it.

Itís also not where the prices are - on the Wiki(?)

What is it??
  Reply With Quote
Old 5th April 2005, 12:48 PM   #416
BrianGT is offline BrianGT  United States
diyAudio Moderator Emeritus
 
BrianGT's Avatar
 
Join Date: Jan 2002
Location: near Atlanta, GA
Send a message via AIM to BrianGT
Quote:
Originally posted by rick57
Readsy to pay, I went looking to check if prices are USD or $C, but couldnít find it.

Itís also not where the prices are - on the Wiki(?)

What is it??
All prices are in USD for the PCB orders, which you can place on the website:
http://www.chipamp.com/aleph

--
Brian
  Reply With Quote
Old 5th April 2005, 12:50 PM   #417
BrianGT is offline BrianGT  United States
diyAudio Moderator Emeritus
 
BrianGT's Avatar
 
Join Date: Jan 2002
Location: near Atlanta, GA
Send a message via AIM to BrianGT
Alright, I have placed both layouts on my webpage:

Version 1a:
http://chipamp.com/diyaudio/ps1a.gif
6 capacitors, board size = 3.5" x 8"

Version 1b:
http://chipamp.com/diyaudio/ps1b.gif
4 capacitors, board size = 3.5" x 6.5"

The capacitor footprints on both layouts accept either the smaller 2-pin or larger 4-pin snap-in capacitors.

Both layouts will be modified to use a TO-220 CRC resistor:
http://www.diyaudio.com/forums/showt...674#post612674

The only real issue with these boards is the extra 1.5" size of the 6 capacitor version.

I placed a poll on my website here:

http://www.briangt.com/gallery/PS-poll

Based on the feedback that I get, I will place the order.

I did some chassis measurements, and 3.5" x 8" works fine in my chassis.

--
Brian
  Reply With Quote
Old 5th April 2005, 12:51 PM   #418
diyAudio Member
 
Join Date: Dec 2002
Location: dry ol Melbourne Australia
Thanks Brian, I've paid you, and now want to pay Jason for the parts

Cheers
  Reply With Quote
Old 5th April 2005, 12:52 PM   #419
troystg is offline troystg  United States
diyAudio Member
 
troystg's Avatar
 
Join Date: Apr 2004
Location: In a dream... Please don't wake me.
Brian-

My 2 cents...

Please add at least another 2 holes on the grnd plane on the output side.. Maybe even a hole big enough for a bolt/nut combo.

There is always something else that needs a good ground point.
__________________
Troy
Thinking positive doesn't make things better, it makes you a better person.
  Reply With Quote
Old 5th April 2005, 12:53 PM   #420
BrianGT is offline BrianGT  United States
diyAudio Moderator Emeritus
 
BrianGT's Avatar
 
Join Date: Jan 2002
Location: near Atlanta, GA
Send a message via AIM to BrianGT
Quote:
Originally posted by rabstg
Brian-

My 2 cents...

Please add at least another 2 holes on the grnd plane on the output side.. Maybe even a hole big enough for a bolt/nut combo.

There is always something else that needs a good ground point.
I will do this for the board. I had multiple output pads on the older board, but removed them during the redesign and forgot to add them again.

--
Brian
  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
mini-aleph versus aleph-3 rmgvs Pass Labs 7 4th February 2010 03:18 PM
Mini Aleph Board & Aleph 2 Parts List gpsmithii Pass Labs 3 16th January 2010 03:58 AM
Aleph Mini / Aleph 3 PCB ready (?) croccodillo Pass Labs 5 27th July 2009 01:51 PM
Difference between Aleph J and Aleph J Mini ppmmcc Pass Labs 5 17th May 2008 06:10 PM
WTB: Aleph-mini PCBs and transistor set for Aleph 30 needtubes Swap Meet 4 6th November 2005 06:29 PM


New To Site? Need Help?

All times are GMT. The time now is 05:43 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