Chip Amp Photo Gallery - Page 20 - diyAudio
Go Back   Home > Forums > Amplifiers > Chip Amps

Chip Amps Amplifiers based on integrated circuits

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 November 2006, 10:28 AM   #191
karma is offline karma  Canada
diyAudio Member
 
karma's Avatar
 
Join Date: Feb 2003
Location: hamilton,ontario
nice work.

cheers
  Reply With Quote
Old 5th November 2006, 11:58 AM   #192
diyAudio Member
 
jackinnj's Avatar
 
Join Date: Apr 2002
Location: Llanddewi Brefi, NJ
Default Re: caps on bridge

Quote:
Originally posted by halo0925
.01uf to .1uf caps are often used on each diode to help damp out the switch on and off of the diode helping to reduce residual AC noise, and some what help its clamping.
Read this -- it works

http://www.hagtech.com/pdf/snubber.pdf
  Reply With Quote
Old 5th November 2006, 06:10 PM   #193
diyAudio Member
 
Join Date: Oct 2004
Good work!

What's your next project, a preamp perhaps?
  Reply With Quote
Old 5th November 2006, 06:24 PM   #194
diyAudio Member
 
Join Date: May 2006
well,
for the moment im doing mainly digital stuff with microcontrollers and so...
but im planning to build a music-driven stroboscope for a party in two weeks...
when audio-related questions come up i will be here again...
so long!
jonas
  Reply With Quote
Old 8th November 2006, 09:44 AM   #195
kmj is offline kmj  Sweden
diyAudio Member
 
kmj's Avatar
 
Join Date: Feb 2004
Location: Falkenberg
My latest contribution. A couple of things that I have spent the last month or two putting together for a friend (have taken my time at it) and have now got all flaws taken care of.

DC-offset can't be measured with my multimeter under normal use and with a pair of ZHorn Herukas (Fostex 168EZ-sigma) a light buzz is just noticeble at a range of a few centimeters so I am quite happy with it. Oh, It is a hardwired LM3875 Gainclone with dual transformers of 2x25V and approx 200VA each.

The preamp is a Freebird with one OPA134 per channel.

The CD is a Marantz CD-57 with some parts removed (thanks to the guys in the Marantz modificationthread!).
Attached Images
File Type: jpg imgp1163.jpg (52.2 KB, 5930 views)
__________________
.....Where the music comes to die.
  Reply With Quote
Old 8th November 2006, 09:46 AM   #196
kmj is offline kmj  Sweden
diyAudio Member
 
kmj's Avatar
 
Join Date: Feb 2004
Location: Falkenberg
another one.
Attached Images
File Type: jpg imgp1164.jpg (47.1 KB, 5707 views)
__________________
.....Where the music comes to die.
  Reply With Quote
Old 8th November 2006, 03:45 PM   #197
diyAudio Member
 
FastEddy's Avatar
 
Join Date: Jun 2006
Location: North Californie
kmj: We notice a Marantz CD player in your system. Wondering if you have considered any players that will playback DVD-A (DVD-Audio) &/or SACD ... ?

That's a really fine pre-amp & amp setup ... wondering also if you have any inside pics?

  Reply With Quote
Old 8th November 2006, 03:59 PM   #198
kmj is offline kmj  Sweden
diyAudio Member
 
kmj's Avatar
 
Join Date: Feb 2004
Location: Falkenberg
Quote:
kmj: We notice a Marantz CD player in your system. Wondering if you have considered any players that will playback DVD-A (DVD-Audio) &/or SACD ... ?
I have a pioneer PD-656 which plays SACD and DVDA but I rarelly use it. I have never gotten hooked on these things, I have some DVD-As but seldom even play them.

Quote:
That's a really fine pre-amp & amp setup ... wondering also if you have any inside pics?
Ah, you want nudiepics?

Preamp
Attached Images
File Type: jpg imgp1165.jpg (75.9 KB, 6339 views)
__________________
.....Where the music comes to die.
  Reply With Quote
Old 8th November 2006, 04:03 PM   #199
kmj is offline kmj  Sweden
diyAudio Member
 
kmj's Avatar
 
Join Date: Feb 2004
Location: Falkenberg
And the poweramp.

I had som buzzing in the beginning and tested to add aluminumfoil as isolation but the problem was ofcourse the grounding as usual ut since I glued it on it has to stay where it is.

It might look like a ratsnest but I swear that it is ok

And building the top and sides in one piece and the bottom, front and back in one makes it easy to fiddle around with

Oh, EDIT:
the sugarlumps (Eurosockets?) came with the broken amps a salvaged them from and since they where already there I didn't bother to remove them. Doing that might make the layout a bit nicer but since it works fine I'll leave it as it is.
Attached Images
File Type: jpg imgp1167.jpg (81.8 KB, 6445 views)
__________________
.....Where the music comes to die.
  Reply With Quote
Old 8th November 2006, 04:33 PM   #200
diyAudio Member
 
FastEddy's Avatar
 
Join Date: Jun 2006
Location: North Californie
" ... DC-offset can't be measured with my multimeter under normal use and with a pair of ZHorn Herukas (Fostex 168EZ-sigma) a light buzz is just noticeble at a range of a few centimeters so I am quite happy with it. ..."

I might suggest adding one or two plastic snubbing capacitors to the pre-amp power supply at the PS output rails ... 0.1 to 1.0 uF MKS type (sprague or other) should do it. Might knock that hum right off the lines. (This would work the same way as the mods you did to your Marantz CD player.)

  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



New To Site? Need Help?

All times are GMT. The time now is 06:12 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