good place for transformers - diyAudio
Go Back   Home > Forums > Design & Build > Parts

Parts Where to get, and how to make the best bits. PCB's, caps, transformers, etc.

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 9th February 2003, 10:19 PM   #1
diyAudio Member
 
Join Date: Oct 2002
Location: south amboy nj
Send a message via AIM to zx3chris
Default good place for transformers

hello,
just wondering where everyone gets their transformers from?? Id prefer to buy new and not have to look around in surplus or ebay -- i dont have many electronic catalogs but the transfo's in jameco, for example, are too weak for what i plan ---
thank u

-chris
  Reply With Quote
Old 9th February 2003, 10:42 PM   #2
ststone is offline ststone  United States
diyAudio Member
 
ststone's Avatar
 
Join Date: Jul 2002
Location: Marriott Assisted Living, Boca Raton, FL
Chris, what kind (V/A/W) of transformers are you looking for ???
BTW. I know some good watering wholes in red bank.
__________________
alleen vragen
  Reply With Quote
Old 9th February 2003, 10:51 PM   #3
diyAudio Member
 
Join Date: Oct 2002
Location: south amboy nj
Send a message via AIM to zx3chris
i plan on making a bi-amping stereo amp, using 4 lm3876's. which are 56w each. supply range is listed from +-24v --> +-84 volts, so i assume i need around 200va and around 80vct transformer... this would be my first amp, so somene let me know what im doing wrong.
  Reply With Quote
Old 9th February 2003, 11:14 PM   #4
ststone is offline ststone  United States
diyAudio Member
 
ststone's Avatar
 
Join Date: Jul 2002
Location: Marriott Assisted Living, Boca Raton, FL
Chris is there a site where we can look up the specs of these
lm3876's
__________________
alleen vragen
  Reply With Quote
Old 10th February 2003, 12:30 AM   #5
diyAudio Member
 
Join Date: Oct 2002
Location: south amboy nj
Send a message via AIM to zx3chris
here are some specs;
http://www.national.com/pf/LM/LM3876.html


here is the full pdf
http://www.national.com/ds/LM/LM3876.pdf

thanx
  Reply With Quote
Old 10th February 2003, 01:51 AM   #6
ststone is offline ststone  United States
diyAudio Member
 
ststone's Avatar
 
Join Date: Jul 2002
Location: Marriott Assisted Living, Boca Raton, FL
Chris, my man...
Read some threads, don't go there.
If you want some music, hang on...
We will help you.
__________________
alleen vragen
  Reply With Quote
Old 10th February 2003, 01:58 AM   #7
JoeBob is offline JoeBob  Canada
diyAudio Member
 
JoeBob's Avatar
 
Join Date: Nov 2001
Location: Montreal, Canada
80vac is way off, read through the datasheets first, instead of 84V I think it may be +/- 48V, which is still really high for the LM style chips, get a 24vac transformer and you'll be good (or lower, like 18vac or 20vac).
  Reply With Quote
Old 10th February 2003, 02:01 AM   #8
diyAudio Member
 
Join Date: Oct 2002
Location: south amboy nj
Send a message via AIM to zx3chris
i was thinking that a 80vct transfo would give me +-40v, which after rectifying would give me ~+/-35V .. would i be correct to assume that 4x56watts=224watts.. transformers are rated in volt amperes not watts, so would a 200 or 250va be correct??

then again, 40vac is ac... so 40/.7 = 57volts dc after smoothing it out...

??
  Reply With Quote
Old 10th February 2003, 04:18 PM   #9
diyAudio Member
 
Join Date: Oct 2002
Location: south amboy nj
Send a message via AIM to zx3chris
ttt...

ive searched thru other threads and found some decent places for transformers, but what should i use to calculate what VA rating i should use ?? I found this formula;

VA = 1.4 x ( WATTS + 2 IDC* )

is this a good guideline to use??
  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
Best place to buy transformers in Toronto? Mike-Toronto Parts 5 25th April 2009 07:25 PM
Toroids, where's a good place to get them? stryperfreak Parts 5 12th December 2007 06:14 AM
Where is a good place to get PCBs manufactured? turbo_slug Parts 12 21st March 2007 04:59 PM
good place to buy acrylic for DIY TT ironcitymadman Analogue Source 19 27th January 2005 06:45 AM
any place to get cheaper transformers? cowanrg Parts 17 17th June 2003 08:27 PM


New To Site? Need Help?

All times are GMT. The time now is 02:37 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