GB for F5T Convertible amplifier boards - Page 5 - diyAudio
Go Back   Home > Forums > Commercial Sector > Group Buys

Group Buys Members group buys

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 September 2012, 01:07 PM   #41
diyAudio Member
 
buzzforb's Avatar
 
Join Date: Oct 2010
Location: Burlington, NC
That sounds good. The Panasonic TSUP 10000uF caps I shipped are 20mm while the Nichicon KG are 35mm, so either will work. Thanks for the work Tea and CRT. Wonder why there is no 2.2k drain resistor in the F5 T manual for the PSU? Does the bridge/thermistor combo perform that action now?
__________________
...Shape the sound , Man!
  Reply With Quote
Old 4th September 2012, 01:48 PM   #42
Tea-Bag is offline Tea-Bag  United States
not politcally affiliated
diyAudio Member
 
Tea-Bag's Avatar
 
Join Date: Feb 2006
Location: Kennebunk
Blog Entries: 7
Certainly has drain resistors on this. I dont think the design meant to miss this - of course I could be wrong.
__________________
Salas Boards 2014 #2 Click Here to Sign Up! |F5TC board and power supplies available PM | Hot-Rod DCB1 boards and kits available PM |Mesmerize kits available (no boards)
  Reply With Quote
Old 4th September 2012, 11:43 PM   #43
bkdog is offline bkdog  Australia
diyAudio Member
 
Join Date: May 2005
Location: in a house
Will there be room for an RC snubber circuit on the board?
  Reply With Quote
Old 5th September 2012, 01:33 PM   #44
Tea-Bag is offline Tea-Bag  United States
not politcally affiliated
diyAudio Member
 
Tea-Bag's Avatar
 
Join Date: Feb 2006
Location: Kennebunk
Blog Entries: 7
Quote:
Originally Posted by bkdog View Post
Will there be room for an RC snubber circuit on the board?
It's worth looking at if it helps with turn on.
I have not seen examples yet of one that will fit the scope of the power supply we are looking for. Any examples of functioning one's for Class A type amps would be helpful for me to look at. I am looking at the Newark Cornell paper which has all the math, but looking for practical implementations.
__________________
Salas Boards 2014 #2 Click Here to Sign Up! |F5TC board and power supplies available PM | Hot-Rod DCB1 boards and kits available PM |Mesmerize kits available (no boards)
  Reply With Quote
Old 6th September 2012, 01:34 PM   #45
Tea-Bag is offline Tea-Bag  United States
not politcally affiliated
diyAudio Member
 
Tea-Bag's Avatar
 
Join Date: Feb 2006
Location: Kennebunk
Blog Entries: 7
bkDog - Where you talking about Snubbers across the diodes? A 100R, 100nf gig?
__________________
Salas Boards 2014 #2 Click Here to Sign Up! |F5TC board and power supplies available PM | Hot-Rod DCB1 boards and kits available PM |Mesmerize kits available (no boards)
  Reply With Quote
Old 6th September 2012, 02:04 PM   #46
bkdog is offline bkdog  Australia
diyAudio Member
 
Join Date: May 2005
Location: in a house
Yep, across the diodes. There seems to be many values listed, 10-50nF and up to 100 ohms in series. It seems to be a matter of trial and error, experimenting and measuring, and somewhat dependent on the transformer used. I too have read the (cornell?) paper you cited before. I have not seen junction capacitance mentioned on the MUR3020 data sheets. If there was space on the board then people could add the snubbers if they wished.

Sorry that is not as helpful as I had wished,
bk
  Reply With Quote
Old 6th September 2012, 03:48 PM   #47
tehrkn is offline tehrkn  Greece
diyAudio Member
 
Join Date: Jun 2011
Location: Piraeus
Quote:
Originally Posted by Tea-Bag View Post
Anyone want to tell me what brand and model caps they would use on a potential power supply board? CRT wants to make sure the snap in holes punch out right.

Looks like this would be the max voltage, capacitance and size from Panasonic.
ECE-T1JP223FA Panasonic Electronic Components | Mouser


It looks like I want to do 4x 40mm diameter caps for each rail (8 total - but maybe 6 to make smaller). Looks like a 220mm x 90mm or so board. With a V-score break off to mount MUR3020 diodes. It will not really be compact, but should fit into a fairly shallow 12-13 inch chassis with maybe the tranny mounted sideways. Will have LED indicators, C-R-C, with bypass caps, screw down terminal mounts for the wires.

Let me know cap preference. We can make this happen.
Well, since Diyaudio store now has a PSU pcb available, which is pretty much the base line PSU for most NPs' amps, I was thinking of a more "extreme" PSU PCB.
Toecutter's version was something like what I had in mind with 8 caps per rail. One could populate all or some and would end up with endless possibilities in total capacitance based on what caps he preferred/liked. Although I would prefer each rail's CRC resistors to be between the rail's caps resulting in a more narrow and long pcb.
Or be a bit more creative and adaptable with a V-scored section with diodes, a main section with 4 caps per rail and CRC, leds etc and expansion V-scored sections each with 1 cap per rail? So one could stack expansion sections after or before CRC to reach targeted capacitance based on caps chosen. Or in case of different PSU and amp chassis he could also have some caps in the amp chassis away from the main cap bank in the PSU chassis.
Just a thought :P
  Reply With Quote
Old 7th September 2012, 03:17 AM   #48
heinz1 is offline heinz1  Europe
diyAudio Member
 
Join Date: Feb 2008
Quote:
Originally Posted by Tea-Bag View Post
...
Any examples of functioning one's for Class A type amps would be helpful for me to look at. I am looking at the Newark Cornell paper which has all the math, but looking for practical implementations.
Here is cviller's implementation of snubbers on his rectfier board (designed for his version of F5):

Gb: Rectifier boards

Photo of board available in post #6 of this thread.
  Reply With Quote
Old 12th September 2012, 01:27 PM   #49
Tea-Bag is offline Tea-Bag  United States
not politcally affiliated
diyAudio Member
 
Tea-Bag's Avatar
 
Join Date: Feb 2006
Location: Kennebunk
Blog Entries: 7
Default Tentative Power supply Layout

Okay,
Here is a what we got so far for a dual rail supply.

Bleeder and LED in front,
Can put a snubber setup on the diodes.
Can use up to 40mm caps.
The difficult part is getting the snap-in pin configurations from some caps.
I will probably use Panasonics pinout for the non two pin units as a baseline.
Those dont have the direct measurements on the data sheet -making it hard to determine exactness of location. I may have to order a couple to test out.

Any other idea of these type of caps, there measurements etc- let me know.
Anyone want to send me a couple?

First pic - both layers - next pic top layer, last pic bottom layer.

Looking for feedback.
Attached Images
File Type: jpg F5 SUPPLY OVERALL copy.jpg (595.1 KB, 348 views)
File Type: jpg F5 TOP COPPER copy.jpg (602.1 KB, 320 views)
File Type: jpg F5 BOTTOM COPPER-1 copy.jpg (584.0 KB, 297 views)
__________________
Salas Boards 2014 #2 Click Here to Sign Up! |F5TC board and power supplies available PM | Hot-Rod DCB1 boards and kits available PM |Mesmerize kits available (no boards)

Last edited by Tea-Bag; 12th September 2012 at 01:28 PM. Reason: pic description
  Reply With Quote
Old 13th September 2012, 05:17 AM   #50
bkdog is offline bkdog  Australia
diyAudio Member
 
Join Date: May 2005
Location: in a house
Quote:
Originally Posted by Tea-Bag View Post
Okay,
Looking for feedback.
It looks great so far!
  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
F5T Premium kit GB buzzforb Group Buys 646 18th May 2014 09:34 PM
Gb: Rectifier boards cviller Group Buys 58 24th October 2010 04:52 PM
B1 Boards V. Mini GB rhysh Group Buys 257 10th June 2010 08:29 AM
Gb: Rectifier boards - alternative peranders Group Buys 8 29th April 2009 02:51 PM


New To Site? Need Help?

All times are GMT. The time now is 11:26 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