Help with small transformer please - 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 6th March 2011, 05:05 PM   #1
diyAudio Member
 
Join Date: Dec 2007
Default Help with small transformer please

Hi guys

I need help with small toroidal tranformer with typical regulation of 35%.

I need 15v of this 7va toroidal. But the open circuit measured 20v

Is there anyway to bring down the voltage? When its underload, it only went down to 18v. How to make it went down to 15v? I cant load it with more.

Thanks in advance

Erwin
  Reply With Quote
Old 6th March 2011, 05:44 PM   #2
diyAudio Member
 
Join Date: Dec 2008
Location: Victoria, BC
Is the secondary wound on top of the primary? You could try unwinding some turns....
  Reply With Quote
Old 6th March 2011, 06:01 PM   #3
diyAudio Member
 
Join Date: Dec 2007
Hi viactoriaguy

Thanks for the respond forget to mention that its a pcb mounted type which is impossible hacking into the sealed case

Are putting resistors in series with the secondary output would help bring down? If possible. Whats the formula to calculate the resiators value?

Erwin
  Reply With Quote
Old 6th March 2011, 09:04 PM   #4
diyAudio Member
 
Join Date: Nov 2008
Erwin: Show us your circuit? Most will be able to handle that 3v difference! E
  Reply With Quote
Old 6th March 2011, 09:16 PM   #5
diyAudio Member
 
Join Date: Dec 2008
Location: Victoria, BC
Quote:
Originally Posted by mickeymoose View Post
Erwin: Show us your circuit? Most will be able to handle that 3v difference! E



There's probably a regulator in the DC side of the circuit that should handle the extra voltage...you might need a bigger heat sink on the regulator if it needs to dissipate more energy.
  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
Need small SET transformer (12B4) Pano Tubes / Valves 31 29th May 2009 01:04 AM
small transformer ferrite source PM650 Parts 0 25th December 2007 11:49 PM
How about this small # toroidal transformer? bigdogwang Parts 4 22nd November 2007 02:10 AM
One big transformer or several small ones. Which is better? DaBit Power Supplies 1 24th June 2007 06:08 PM
Transformer wires too small? drfrink24 Chip Amps 3 4th March 2005 07:45 PM


New To Site? Need Help?

All times are GMT. The time now is 12:34 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