New LM1875 pcb and kit pre-order special - Page 4 - diyAudio
Go Back   Home > Forums > Commercial Sector > Vendor Forums > Chipamp

Chipamp IC amp kits & PC boards from ChipAmp

Reply
 
Thread Tools Search this Thread
Old 2nd May 2010, 06:07 PM   #31
diyAudio Member
 
Join Date: Jul 2006
Quote:
Originally Posted by AndrewT View Post
Badly.

But seriously, the 1875 has a maximum output of 3Apk when it is cold. The limit will reduce at elevated temperatures.

If you use a 4 chip bridged parallel assembly each chipamp sees a load equal to your actual load.

The best you can get is ~6Apk into 4r0. About 72W into 4r0.
Into a real speaker you would need to double the chip count to 8, or preferably 12, i.e. 6off in parallel and then two sets bridged.
Thank you
  Reply With Quote
Old 3rd May 2010, 07:29 AM   #32
diyAudio Member
 
Join Date: Sep 2008
Quote:
Originally Posted by booangler View Post
I am currently putting Mouser order together that I would be happy to share with you. -- Alan
So sorry I stopped following this thread -- a belated thank you for your kindness.
__________________
"Life is hard -- afterall it kills you ..."
Katharine Hepburn
  Reply With Quote
Old 7th May 2010, 08:03 PM   #33
diyAudio Member
 
Join Date: Jan 2008
Hello,
my LM1875 chipamp amplifier produces a plock when I turn it off ; it all works fine but it plocks. Why should this LM1875 produce a plock when LM3886 is dead quiet ??
  Reply With Quote
Old 24th September 2010, 03:26 PM   #34
diyAudio Member
 
Join Date: Sep 2010
Location: Manchester
Question Power supply caps

Hi,
Im currently building one of these from your kits and have damaged one of the 1500uf capacitors. Im having trouble sourcing one over here and wondered if it would be a problem to replace both with 1000uf instead ?
Thanks
  Reply With Quote
Old 28th May 2011, 10:11 PM   #35
jemraid is offline jemraid  United Kingdom
diyAudio Member
 
Join Date: Aug 2004
Location: NE Derbyshire
Hi all,

I'm going to start making my LM1875 soon using a 12-0-12 300VA Transformer into 4 Ohm MA CHP-70s I noticed that on the component list on Page 2 it says;

C1 - 2.2F (optional input capacitor)
C2 - 22F bipolar (optional)

Shouldn't that be the other way round e.g.
C1 - 2.2F bipolar (optional)
C2 - 22F (optional input capacitor)


Jim
__________________
FH3 build using very simple tools and a point to point Gain Clone with largish power supply. http://www.jasread.com/fh3/index.html

Last edited by jemraid; 28th May 2011 at 10:29 PM.
  Reply With Quote
Old 28th May 2011, 11:20 PM   #36
diyAudio Member
 
neutron7's Avatar
 
Join Date: Dec 2003
Location: Toronto Canada
LM1875 - 20-W Audio Power Amplifier

No it is right. That 22uf is for the capacitor c3
  Reply With Quote
Old 29th May 2011, 12:15 AM   #37
jemraid is offline jemraid  United Kingdom
diyAudio Member
 
Join Date: Aug 2004
Location: NE Derbyshire
Errrrm Neutron

C3 is 0.1 uf I just looked at your link.

Passed through that one :-)

Jim
__________________
FH3 build using very simple tools and a point to point Gain Clone with largish power supply. http://www.jasread.com/fh3/index.html
  Reply With Quote
Old 29th May 2011, 01:38 AM   #38
diyAudio Member
 
neutron7's Avatar
 
Join Date: Dec 2003
Location: Toronto Canada
oops i meant C2.

In most cases leave it out anyways.
  Reply With Quote
Old 29th May 2011, 08:12 AM   #39
jemraid is offline jemraid  United Kingdom
diyAudio Member
 
Join Date: Aug 2004
Location: NE Derbyshire
Dear Neutron,

C2 again looking at your link is 22uf 'polarised'
C1 is bipolar 2.2uf

So the list should read

C1 - 2.2F bipolar (optional)
C2 - 22F polarised (optional)

Jim
__________________
FH3 build using very simple tools and a point to point Gain Clone with largish power supply. http://www.jasread.com/fh3/index.html
  Reply With Quote
Old 29th May 2011, 08:16 AM   #40
jemraid is offline jemraid  United Kingdom
diyAudio Member
 
Join Date: Aug 2004
Location: NE Derbyshire
Dear Neutron,

[QUOTE}
Pic from initial prototype:
Click the image to open in full size.
I will see if I can get pics posted from the assembled amp soon also.
[/QUOTE]

Looking at the above a Wima [Red] capacitor can be seen in the C1 position and a polarised electrolytic in the C2 position.

Somone should alter the list people [like me!] are going to be ordering the wrong stuff.

Jim
__________________
FH3 build using very simple tools and a point to point Gain Clone with largish power supply. http://www.jasread.com/fh3/index.html
  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
1st order Passive Line Level Crossover + 2nd order Highpass? alexclaber Multi-Way 11 4th January 2008 07:15 PM
deceptive perception ? 1st order-2nd order question poldus Multi-Way 4 10th April 2007 11:58 PM
My 1st order butterworth filter better than 4th order L-R: Why? philipreji Solid State 61 1st March 2007 04:50 PM
2nd Order Tweeter + 3rd Order Woofer = OK? Jay Multi-Way 3 12th September 2005 12:12 PM
1st order ? L-R 2nd order? or transient perfect?? Ken L Multi-Way 6 17th October 2003 04:22 PM


New To Site? Need Help?

All times are GMT. The time now is 05:43 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