OLD THREAD Hi-end phono preamplifier by Andrea Ciuffoli - Page 28 - diyAudio
Go Back   Home > Forums > Commercial Sector > Vendor Forums > Quanghao Audio Design

Quanghao Audio Design Quanghao Audio Design is a producer of DIY Audiophile Kits and PCB boards, selected from many listening tests!

Reply
 
Thread Tools Search this Thread
Old 4th August 2010, 07:40 AM   #271
diyAudio Member
 
tangmonster's Avatar
 
Join Date: Jul 2007
Location: Cape Town
Hi quanghao

How hot does your irf9610 heatsink get?

The heatsink you prescribed is 8c/w

The heatsink I used is 6.8c/w

When I power it up I set the voltages correctly but the heat sink gets VERY hot i can't Touch it with my finger too long. Is this normal?
  Reply With Quote
Old 4th August 2010, 08:06 AM   #272
diyAudio Member
 
Join Date: Sep 2009
Location: Vietnam
Blog Entries: 2
Send a message via Yahoo to quanghao
Quote:
Originally Posted by tangmonster View Post
Hi quanghao

How hot does your irf9610 heatsink get?

The heatsink you prescribed is 8c/w

The heatsink I used is 6.8c/w

When I power it up I set the voltages correctly but the heat sink gets VERY hot i can't Touch it with my finger too long. Is this normal?
Hi! how voltage between R1?? R1 = 33 ohm??
I'm sure V across 9610 is very big??
About max 30V .now you can change R11, is bigger 200R to 470R or 1K, and 10W.
It is mean:
Attached Images
File Type: jpg 1.jpg (124.8 KB, 318 views)
__________________
Group buy DAC-END R (ES9018) full assembled board
update 06/14/2013 :http://www.audiodesignguide.com/DAC32/index2.html
  Reply With Quote
Old 4th August 2010, 08:24 AM   #273
diyAudio Member
 
tangmonster's Avatar
 
Join Date: Jul 2007
Location: Cape Town
voltage across R1 = 2.3V

AC voltage is 238V
DC voltage 285v Dc this is measured across C5
R11 is currently 220R


I think i will make R11 1K an see what happens.

all my measurements are with no load connected and only power supply plugged in.

Thanks!!

Last edited by tangmonster; 4th August 2010 at 08:30 AM.
  Reply With Quote
Old 4th August 2010, 08:32 AM   #274
diyAudio Member
 
Join Date: Sep 2009
Location: Vietnam
Blog Entries: 2
Send a message via Yahoo to quanghao
When you Test SSHV , you not conect to Phono board with Tube D3a???
If no!

You have to use one R=4.7-10K/10W min for Load, And test is!
You see in the image!
Attached Images
File Type: jpg US-buit-SSHV1.jpg (341.0 KB, 325 views)
__________________
Group buy DAC-END R (ES9018) full assembled board
update 06/14/2013 :http://www.audiodesignguide.com/DAC32/index2.html
  Reply With Quote
Old 4th August 2010, 08:37 AM   #275
diyAudio Member
 
tangmonster's Avatar
 
Join Date: Jul 2007
Location: Cape Town
OK , I' will then connect it to a load or phono board before testing again.
  Reply With Quote
Old 4th August 2010, 09:30 AM   #276
diyAudio Member
 
Join Date: Sep 2005
Send a message via MSN to audiodesign Send a message via Skype™ to audiodesign
To get the max performances is necessary to use the new riaa and the new interstage caps.

It is possible use the old value but the expensive silver mica and Jensen caps give another sound.

If you use the new value the result will be near to hi-end Audionote products (7000-10000$ value).

I suggest the old values only if you have normal amplifiers, not hi-end vacuum tubes.
  Reply With Quote
Old 4th August 2010, 12:55 PM   #277
diyAudio Member
 
Join Date: May 2007
Location: Brazil Recife
Quote:
Originally Posted by audiodesign View Post
To get the max performances is necessary to use the new riaa and the new interstage caps.

It is possible use the old value but the expensive silver mica and Jensen caps give another sound.

If you use the new value the result will be near to hi-end Audionote products (7000-10000$ value).

I suggest the old values only if you have normal amplifiers, not hi-end vacuum tubes.
Hi Andrea

What makes the difference? The values or the cap material?
If I use the old values 100nF/33nF und put silver mica, the new value with silver mica will sound better?
There are russian silver mica SS3, the can go to this old value, you have experience with them?
I know that the quality of the coopling caps has a great influence.
What is about the resistors in the filter circuit, its better to use tantal R?

Klaus
  Reply With Quote
Old 4th August 2010, 01:14 PM   #278
diyAudio Member
 
Join Date: Sep 2005
Send a message via MSN to audiodesign Send a message via Skype™ to audiodesign
the cap materials make the difference, both values are good

The mica and Jensen are very expensive so it is better reduce the values.

It is not possible use 2.2uF Jensen copper film paper in oil.
  Reply With Quote
Old 4th August 2010, 01:55 PM   #279
diyAudio Member
 
tangmonster's Avatar
 
Join Date: Jul 2007
Location: Cape Town
With power supply connected to phono board

R1 = 220R 5W = 80C
9610 is 67C
840 is 60C

irf 9610 too hot

R1 = 1K 10W = 125C
9610 is 37C
840 is 42C

Resistor too hot.

Going to try 500R 20W resistor

In hindsight I should have gotten a 190Vac or 200Vac Transformer and NOT a 230V ac transformer.
  Reply With Quote
Old 4th August 2010, 02:14 PM   #280
diyAudio Member
 
tangmonster's Avatar
 
Join Date: Jul 2007
Location: Cape Town
R1 = 22r = 16V drop
R1 = 1k = 67V drop

R1 = 500R 20W= 35V drop = 65C
irf840 = 50C
irf9610 = 60C

I suppose i am going to

Is 60C ok for irf9610? or is it too high?
  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
OLD THREAD DAC End by Andrea Ciuffoli quanghao Quanghao Audio Design 2062 23rd May 2014 03:30 AM
Hi-end phono preamplifier quanghao Quanghao Audio Design 8 30th June 2010 03:37 AM
The DAC End 2 by Andrea Ciuffoli pcb + most parts... prooptiki Swap Meet 7 31st May 2010 02:21 AM
Custom designed transformer for Andrea Ciuffoli 6c33c OTL AMP.... zxcxz Tubes / Valves 2 10th July 2009 04:14 PM
Andrea Ciuffoli Mosfet Amp DieterD Solid State 16 24th December 2001 05:56 AM


New To Site? Need Help?

All times are GMT. The time now is 10:09 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