Can someone advise me on a chip for a gainclone? (In the UK) - 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 2nd January 2007, 07:01 PM   #1
diyAudio Member
 
Join Date: Jan 2007
Default Can someone advise me on a chip for a gainclone? (In the UK)

I'm just getting all the parts together that I need to build the thing. I'm from the UK, and can't find the LM3875 that everyone seems to like. I'd probably get the chip from Maplins, thier selection is as follows:

http://www.maplin.co.uk/search.aspx?...=2m1&worldid=3

So far, the one I think is more appropriate is the first one on that page, the LM380N. Does anyone have any suggestions? I assume I need 2 of the chips? For stereo sound.

I have another question about the right transformer to get. Suppose I did use 2 of the above chips, from the datasheet it says high peak current capability is 1.3A, and supply voltage is 10-22v. Does that mean I'd need a transformer with an output VA of 22 * 1.3 * 2 ~ 60?

Many thanks.
  Reply With Quote
Old 2nd January 2007, 07:11 PM   #2
Nordic is offline Nordic  South Africa
diyAudio Member
 
Nordic's Avatar
 
Join Date: Sep 2005
You should have no problem ordering from farnell or even rs components... they are uk based, but i regularly get stuff from them...
  Reply With Quote
Old 2nd January 2007, 09:21 PM   #3
diyAudio Member
 
ianpengelly's Avatar
 
Join Date: Oct 2006
Try RS like Nordic suggested or if you are willing to try the 3886 then try www.Madaboutsound.com
  Reply With Quote
Old 2nd January 2007, 11:51 PM   #4
diyAudio Member
 
Join Date: Jan 2007
Thanks for the replys.
I looked at the Mad about Sound website, but it involves me buying a £15:28 amp kit, which is not what I really want to spend for a chip. I want to build the thing myself, rather than from a kit. Do you know of any other places where I can get just the chip?
Nordic, do the sites you suggested have a minimum order amount? Or large postage cost? I suggested Maplin as I can get into the shop, and therefore not have to pay any postage. I also have all the other components I need (other than a transformer) to build the amp, therefore a £20 order (for example) would be a waste of money for a chip.
Many thanks.
  Reply With Quote
Old 3rd January 2007, 12:04 AM   #5
diyAudio Moderator
 
pinkmouse's Avatar
 
Join Date: Apr 2002
Location: Chatham, England
The 380 isn't really much cop for anything apart from headphones, and I have never used the TDA chips, so can't comment on those. Drop Vikash a line, he may well have spares of the LMs.
__________________
Rick: Oh Cliff / Sometimes it must be difficult not to feel as if / You really are a cliff / when fascists keep trying to push you over it! / Are they the lemmings / Or are you, Cliff? / Or are you Cliff?
  Reply With Quote
Old 3rd January 2007, 06:04 AM   #6
diyAudio Member
 
ianpengelly's Avatar
 
Join Date: Oct 2006
Hi Pinkmouse, you beat me to it!

I was going to say drop madaboutsound an email and ask if they would supply just a chip/chips, Vikash (on this forum) runs madabout sound.
  Reply With Quote
Old 3rd January 2007, 06:45 AM   #7
Nordic is offline Nordic  South Africa
diyAudio Member
 
Nordic's Avatar
 
Join Date: Sep 2005
No minimum order at RS, although some components you have to buy in quantities of 5 or so... those chips you can buy in singles... I got one from them a few weeks ago...

Also see if they don't have a trade counter in your area... then you can pick up without paying for postage...that is what I do... if it works all they way down in Africa, it should be no hassle over there... in fact you never have to wait for ex UK stock like me...
  Reply With Quote
Old 3rd January 2007, 08:44 AM   #8
diyAudio Member
 
ianpengelly's Avatar
 
Join Date: Oct 2006
If you are going to order from RS make sure you do it online otherwise there may be a £3.50 handling charge, the £20 minimum only applies to phone, fax and email orders.

I am going to place an order for some pre-amp components in the next week, if you can wait that long I can add a couple of 3875 chips in my order and post them to you when I get them (assuming no one else offers you some before then). Then you can just send me a cheque or a paypal payment.

Cheers,

Ian
  Reply With Quote
Old 3rd January 2007, 11:24 AM   #9
Vikash is offline Vikash  United Kingdom
diyAudio Moderator Emeritus
 
Vikash's Avatar
 
Join Date: May 2003
Location: UK
Hi Mat, I've replied to your email.

Yes each chip is single channel, so you will need 2 for stereo. Any dual secondary toroidal with greater than 160 VA will suffice. Look for secondary voltage rating of between 18v and 24v.
__________________
"The human mind is so constituted that it colours with its own previous conceptions any new notion that presents itself for acceptance." - J. Wilhelm. (But I still think mine sounds better than yours.)
  Reply With Quote
Old 3rd January 2007, 11:28 AM   #10
diyAudio Member
 
Join Date: Jan 2007
Thanks for all the replys.
I have emailed Mad about Sound, waiting for a reply. They seem to be out of stock on the RS site, so I guess i'll have to wait. Ian, that's a very generous offer, thank you very much. However if there isn't a minimum order cost or postage cost is there an advantage in combining orders?
Am I right in thinking I will need 2 chips, for stereo sound?
And finally, what transformer would you advise me to get? Probably from RS as there is no postage cost. I'm in the UK so 240v input.
Many thanks.
  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
Favorite transformers for chip amp and gainclone? danielwritesbac Chip Amps 19 18th October 2008 07:09 AM
GainClone Design -- PSU, which chip, grounding, clipping queries wes-ninja250 Chip Amps 5 19th August 2005 06:08 AM
New Gainclone chip TAS5112 2 x 50W peranders Chip Amps 2 17th October 2003 09:28 AM
16 chip gainclone wiring Matttcattt Chip Amps 32 23rd July 2003 04:40 PM
Chip (gainclone?) type headphone amp Vladco Headphone Systems 14 21st June 2003 04:31 AM


New To Site? Need Help?

All times are GMT. The time now is 04:36 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