Aleph J Schematic - Page 103 - diyAudio
 Aleph J Schematic
 User Name Stay logged in? Password
 Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read Search

 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
 2nd February 2012, 12:57 PM #1021 diyAudio Member     Join Date: Oct 2004 Location: At the sea front, Rotterdam or Curaçao For the thermistor : 1.6A bias translates to ~150W dissipation. With transformer and rectifier losses, assume some 200VA going in on the primary side. Mains on your end is likely 220Vac, 200VA divided by 220V makes ~0.9A Suppose you used a CL-110 thermistor from General Electric, 10R and 3.2A At 0.9A current, it would have a resistance of about 1 Ohm, thermistor steady-state dissipation would be around 3/4 W. (from back of my head guessti-culus, you can pinpoint the exact figures if you download a CL datasheet and type in the numbers) The primary fuse is for your protection, not the output stage. Whatever you feel comfortable with. __________________ It doesn't count how one deals with winning, but how to handle a loss (© DjT) https://www.youtube.com/watch?v=FJEzEDMqXQQ
 5th February 2012, 02:58 PM #1022 diyAudio Member   Join Date: Mar 2009 I didn't find at my supplier same value resistors for R9-R13(221 ohms) closest values that I found are 210 ohms and 237 ohms.Now i know that for R9-R12 I could use 210-237 ohms without problems, but what about R13? would be ok one of those two values? which one?
 5th February 2012, 10:31 PM #1023 diyAudio Member     Join Date: Oct 2004 Location: At the sea front, Rotterdam or Curaçao Hardly makes a difference, Q3 is just a safeguard. R13+R14 make a voltage divider, Q3 is turned on when the current through Q7 goes above a couple of amps, draws down the voltage on the gates of Q7+Q8. 210 or 237 makes peak current go up/down 2 to 3%. __________________ It doesn't count how one deals with winning, but how to handle a loss (© DjT) https://www.youtube.com/watch?v=FJEzEDMqXQQ
 6th February 2012, 06:20 AM #1024 diyAudio Member   Join Date: Mar 2009 Thank You
diyAudio Member

Join Date: Mar 2009
Hello

I want to build the amp with Peter Daniels boards and will be two monoblocks.Now i don't know where to mount the boards exactly but I am thinking at two possibilities :
first one is to mount the board on the rear panel and connect each of the mosfets with 1.5 mm diameter and 20-22cm long wire
second one is to mount the board on one of the heatsinks and solder Q7 and Q8 directly so I will have a short signal path and connect with 1.5 mm diameter and 20-22cm long wires only Q5 and Q6 (ccs)
Heatsink size is 300x164x40 mm and interior of amplifier case is 300x164x200 mm
What do you recommend?
Attached Images
 amp.jpg (71.9 KB, 545 views)

 10th February 2012, 05:53 PM #1026 Official Court Jester diyAudio Member     Join Date: Jan 2003 Location: ancient Batsch , behind Iron Curtain put pcb horizontally in a middle of the amp then shorter wires for mosfets left and right it's wise to ensure that mosfet's gate resistors are near gate pins __________________ my Papa is smarter than your Nelson ! clean thread; Cook Book;PSM LS Cook Book;Baby DiyA ;Mighty ZM's Bloggg;Papatreasure;Papa...© by Mighty ZM
 10th February 2012, 07:17 PM #1027 diyAudio Member   Join Date: Mar 2009 Thanks.I will try to design something to see how it will look like
 10th February 2012, 08:50 PM #1028 diyAudio Member   Join Date: Jul 2004 Location: South West Germany More easy is to mount the board on one heatsink because you have sufficient space, thus you can screw the IRF's directly on the heatsink using mica or polyimide sheets for electrical isolation. The PSU you can mount flat on the bottom together with the rectifiers. This is the way I have even assembled the stereo version in one case, without any thermal problem.
diyAudio Member

Join Date: Mar 2009
How can I read the psu ripple from the attached photos?
Attached Images
 rip1.jpg (139.4 KB, 432 views) rip2.jpg (125.8 KB, 374 views)

 17th February 2012, 05:19 PM #1030 diyAudio Member     Join Date: Oct 2004 Location: At the sea front, Rotterdam or Curaçao By reading the table ? [Smart man calculates by head to check. First 66,000uF (33,000) capacitor & 4A current gives primary ripple (easy formula). 0R5 plus second 66,000uF (33,000) cap makes a standard RC filter ] __________________ It doesn't count how one deals with winning, but how to handle a loss (© DjT) https://www.youtube.com/watch?v=FJEzEDMqXQQ

 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 OffTrackbacks are Off Pingbacks are Off Refbacks are Off Forum Rules

 Similar Threads Thread Thread Starter Forum Replies Last Post kendt Pass Labs 17 24th March 2012 01:38 AM roger-k Pass Labs 2 29th January 2006 12:49 AM Kovax Pass Labs 2 1st July 2003 08:49 PM

 New To Site? Need Help?

All times are GMT. The time now is 02:19 PM.