F5 with 2SK2013/2SJ313 - Page 52 - 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 2013, 08:38 AM   #511
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
I wire my indicator LED that way.
Across both rails with a Zener + resistor dropper.
The closer the Zener voltage to the rail voltage the more quickly the LED dims as the rail voltage drops.

But A nice idea.
How can it be applied to a "normal" speaker delay relay?
__________________
regards Andrew T.
  Reply With Quote
Old 5th April 2013, 11:08 AM   #512
Anchan is offline Anchan  United States
diyAudio Member
 
Join Date: Jul 2009
Quote:
Originally Posted by AndrewT View Post

How can it be applied to a "normal" speaker delay relay?
Well, I think a capacitor can be added in there to create a slower delayed start. So that could create more of a slower "normal" speaker delay relay.

But that would also slow down the speaker protection in case of rail failure, so it would not suit my particular needs. But I think it can be adapted for different applications.

Also, I should clarify that the zener does set the threshold so that the coil only activates at a certain voltage. But it is also needed to set the deactivation point since most relays activate at 70 or 80% of rated coil voltage, but deactivate, once triggered, at only 10%, which isn't so great for a protection circuit.
  Reply With Quote
Old 17th May 2013, 06:57 PM   #513
NicMac is offline NicMac  Italy
diyAudio Member
 
NicMac's Avatar
 
Join Date: Feb 2009
I have acquired and traced a fair number of 2SK2013/2SJ313 in the last period
I have attached a plot illustrating the distribution of Vgs and Yfs measured @0.5A and it looks fairly good. In general the devices are remarkably linear in the 0.3-0.9A range and I look very much forward to build a F5/F5X with these
Attached Images
File Type: png Vgs_Yfs.png (58.6 KB, 410 views)
  Reply With Quote
Old 18th May 2013, 10:05 AM   #514
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
The k2013 seem almost random in comparison to the correlation showing for the j313.
Yfs vs Vgs seems to be strongly correlated for the Pchannel.

Is there a science reason for the Pchannel to show this, or is it just chance that the Nchannel are all over the place?
__________________
regards Andrew T.
  Reply With Quote
Old 24th May 2013, 01:19 AM   #515
Anchan is offline Anchan  United States
diyAudio Member
 
Join Date: Jul 2009
Hello,
Being that Georg is out of PCB's, and he's all the way in Germany too, I decided to make a few boards for personal use.

I used ExpressPCB, and the idea is to go econo all the way, meaning no solder mask, silkscreen, etc. So before I order, I figured I'd see if anyone else would like a pair.

For one pair for myself, the cost turns out to be $93 for the pair. If I get 5 pairs made it comes out to be $35 for the pair ($17.50 per channel).

The board has a few slight modifications. First, I am using a spare set of Vicor switching supplies that I have laying around, so I added an inductor on each rail, which can be bypassed if you don't want to use it. Also, I will be using a small fan, so I added a spot for a regulator and connector for the fan. I also added some caps around the feedback resistors and input, but you can totally leave those off.

Board size is 2" X 6.6".

Open to comments if anything seems weird/wrong with layout. Let me know if you want a set. I plan on ordering probably next week.

Thanks
Attached Files
File Type: pdf JumaF5Variation_Anchan.pdf (26.2 KB, 82 views)
File Type: pdf JumaStyleF5.pdf (192.6 KB, 78 views)
File Type: pdf BOMJumaStyleF5.pdf (22.9 KB, 39 views)
  Reply With Quote
Old 24th May 2013, 02:55 AM   #516
Anchan is offline Anchan  United States
diyAudio Member
 
Join Date: Jul 2009
I might space the FETs out a little more. Right now they are about 18mm apart, center to center.
  Reply With Quote
Old 24th May 2013, 03:47 AM   #517
Anchan is offline Anchan  United States
diyAudio Member
 
Join Date: Jul 2009
Default Revised

Revised slightly longer version
7.7" X 1.875" (195.6mm X 47.6mm)
FETs spaced exactly 1" on center (25.4mm)
Attached Files
File Type: pdf JumaF5Variation_AnchanLonger.pdf (26.3 KB, 56 views)
  Reply With Quote
Old 24th May 2013, 05:18 AM   #518
NicMac is offline NicMac  Italy
diyAudio Member
 
NicMac's Avatar
 
Join Date: Feb 2009
Anchan,
I'm be interested in boards for 8 channels, but I would greatly appreciate provisions for the smd degeneration resistor for the J74 JFET. The trick of EUVL used in the F5X. I would also be using Caddock's for the MOSFET source resistors. Maybe you need some transistors

Cheers,

Nic
  Reply With Quote
Old 24th May 2013, 05:24 AM   #519
NicMac is offline NicMac  Italy
diyAudio Member
 
NicMac's Avatar
 
Join Date: Feb 2009
Quote:
Originally Posted by AndrewT View Post
The k2013 seem almost random in comparison to the correlation showing for the j313.
Yfs vs Vgs seems to be strongly correlated for the Pchannel.

Is there a science reason for the Pchannel to show this, or is it just chance that the Nchannel are all over the place?
One of the J313 batches I got my on hands are outliers (high Vgs). Everything under control
I my hands they are much more linear and homogenous than the K1530/J201 that I have some experience with

I look very much forward to building a F5X-Juma
  Reply With Quote
Old 24th May 2013, 09:14 AM   #520
Anchan is offline Anchan  United States
diyAudio Member
 
Join Date: Jul 2009
Quote:
Originally Posted by NicMac View Post
Anchan,
I'm be interested in boards for 8 channels, but I would greatly appreciate provisions for the smd degeneration resistor for the J74 JFET. The trick of EUVL used in the F5X. I would also be using Caddock's for the MOSFET source resistors. Maybe you need some transistors

Cheers,

Nic
8 channels will certainly bring down the cost, so maybe I can help
I'm not familiar with the smd degeneration resistor for the J74. If you have a value, or better yet a specific part number, maybe I'll throw it in.

As for the Caddock FET source resistors, do you have a specific part #? If I can get them, preferably from Digikey or Mouser, here in the US, maybe I'll use them too.

I do already have the transistors. Got the FETs from member PRAKIT, and jfets from Spencer at FET Audio.
  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
I need Help with my F5.... rtate Pass Labs 15 1st December 2009 11:07 PM
F5 Help Needed vdi_nenna Pass Labs 84 2nd October 2009 02:33 AM
F5 enough for floorstanders? pathetic Pass Labs 1 15th September 2009 02:45 AM
Thanks for the F5! CBRworm Pass Labs 2 13th September 2009 09:34 PM
Anybody help with F5? yammy1688 Pass Labs 2 28th October 2008 03:50 PM


New To Site? Need Help?

All times are GMT. The time now is 03:29 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