Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Analogue Source Turntables, Tonearms, Cartridges, Phono Stages, Tuners, Tape Recorders, etc.

Mpp
Mpp
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 16th August 2012, 02:41 PM   #6821
Joachim Gerhard is online now Joachim Gerhard  Germany
diyAudio Member
 
Joachim Gerhard's Avatar
 
Join Date: Mar 2009
Jacco thanks, you have hidden qualities.

patriz, yes this potmeter is linear. I use Alps blue with middle dent.
Marcin even made a PCB. You can send him a PM if you want information.
  Reply With Quote
Old 16th August 2012, 03:01 PM   #6822
RCruz is offline RCruz  Switzerland
nhinstruments
diyAudio Member
 
RCruz's Avatar
 
Join Date: Sep 2006
Location: Wallis
Mpp
Almost finished stuffing the second board Just waiting for some micas for the power transistors.

Now I am in trouble with the riaa caps... my sourcing went wrong and bought amtrans caps from hificollective... too much variation... need to use big caps I have in stock (REL-CAP 15n) so I will use an external riaa after all.

To connect the external riaa, is it sufficient to connect it to the indicated place in the board or do I need to do some shunts ?
__________________
RC
  Reply With Quote
Old 16th August 2012, 04:09 PM   #6823
FdW is offline FdW  Netherlands
diyAudio Member
 
FdW's Avatar
 
Join Date: Feb 2009
Location: Both feet on the ground (near Gouda)
Mpp
Quote:
Originally Posted by jacco vermeulen View Post
Mpp

Hoplahop ?
Jacco (I am confused/puzzled) why re-posting these links? Hoplahophop
  Reply With Quote
Old 16th August 2012, 04:18 PM   #6824
jacco vermeulen is offline jacco vermeulen  Netherlands
diyAudio Member
 
jacco vermeulen's Avatar
 
Join Date: Oct 2004
Location: At the sea front, Rotterdam or Curaçao
Send a message via Yahoo to jacco vermeulen
154210-mpp-574.html#post2982127 is not 154210-mpp-115.html#post2982127
__________________
Why does it hurt when I Pee ? (Ay Ay Ay https://www.youtube.com/watch?v=w5fLGWrHouk)
  Reply With Quote
Old 16th August 2012, 04:38 PM   #6825
FdW is offline FdW  Netherlands
diyAudio Member
 
FdW's Avatar
 
Join Date: Feb 2009
Location: Both feet on the ground (near Gouda)
Mpp
Quote:
Originally Posted by jacco vermeulen View Post
154210-mpp-574.html#post2982127 is not 154210-mpp-115.html#post2982127
That's stange, both links (the one Joachim posted and the one you posted) bring me to the same page #574
  Reply With Quote
Old 16th August 2012, 05:13 PM   #6826
brianco is offline brianco  Ireland
diyAudio Member
 
brianco's Avatar
 
Join Date: Aug 2005
Location: Scottish Borders - Kelso; on the famous Tweed River!
Jacco posted TWO apparently identical posts. The earlier one of these takes you to a different page than does the later one. The problem is the use of abbreviated links.
  Reply With Quote
Old 16th August 2012, 06:25 PM   #6827
jacco vermeulen is offline jacco vermeulen  Netherlands
diyAudio Member
 
jacco vermeulen's Avatar
 
Join Date: Oct 2004
Location: At the sea front, Rotterdam or Curaçao
Send a message via Yahoo to jacco vermeulen
With copy & paste such links on the same page, you can do fun stuff with the cache memory on your PC.
__________________
Why does it hurt when I Pee ? (Ay Ay Ay https://www.youtube.com/watch?v=w5fLGWrHouk)
  Reply With Quote
Old 16th August 2012, 09:08 PM   #6828
FdW is offline FdW  Netherlands
diyAudio Member
 
FdW's Avatar
 
Join Date: Feb 2009
Location: Both feet on the ground (near Gouda)
Mpp
Quote:
Originally Posted by FdW View Post
One small update, the power supply has been fixed. And the LME49710's have been checked. To my amazement thy survived (running on +15 and -25 volts). So the big disasters is in fact not so big at all

Next I have to replace the vas-transistors and figure why I could not set bias (I di suspect one of the driver mosfets). I'l b' b'ck
Another update, it's a amplifier, the bias can be set, the gain is as expected, and (while using the 100 Watt lamp in the power supply) it can (and did) kill a 250 mW 10 Ohm resistor that posed as a loudspeaker

Tomorrow more testing with the lamp in place, and maybe a few watts of music (you see I am getting very careful (maybe a bit to )).

This is all going on very slow due to work being very demanding at the moment, but I am getting there.
  Reply With Quote
Old 16th August 2012, 09:27 PM   #6829
Joachim Gerhard is online now Joachim Gerhard  Germany
diyAudio Member
 
Joachim Gerhard's Avatar
 
Join Date: Mar 2009
Yes, building high power amps is harder then making low level stuff.
  Reply With Quote
Old 16th August 2012, 09:31 PM   #6830
Joachim Gerhard is online now Joachim Gerhard  Germany
diyAudio Member
 
Joachim Gerhard's Avatar
 
Join Date: Mar 2009
You know that i like buffers. Here is an distortion canceling design by our Dimitry :JFET Follower Amplifier Cancels Distortion
  Reply With Quote

Reply


MppHide 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

Forum Jump


New To Site? Need Help?

All times are GMT. The time now is 09:29 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.79%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright ©1999-2017 diyAudio
Wiki