Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems.

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
  #1   Report Post  
Posted to sci.electronics.repair
external usenet poster
 
Posts: 412
Default 25V/70V Transformer identification

I have a large number of small line to voice transformers that came
out of a very large municipal facility These are all from different
manufacturers. Some are tapped to watts and some are different. I
would like to re employ these on a current project which will require
70V units , but I do not know whether they are 25V or 70V
transformers. Can anyone suggest an easy way to determine this? I have
tried comparing them with known transformers, however resistance
readings are too variable to determine anything concrete. Thanks, Lenny
  #2   Report Post  
Posted to sci.electronics.repair
external usenet poster
 
Posts: 12,924
Default 25V/70V Transformer identification

On 6/17/2012 4:15 PM, klem kedidelhopper wrote:
I have a large number of small line to voice transformers that came
out of a very large municipal facility These are all from different
manufacturers. Some are tapped to watts and some are different. I
would like to re employ these on a current project which will require
70V units , but I do not know whether they are 25V or 70V
transformers. Can anyone suggest an easy way to determine this? I have
tried comparing them with known transformers, however resistance
readings are too variable to determine anything concrete. Thanks, Lenny



The only way to know is to measure the turns ratio, if they are unmarked.

Turns ratio squared* low side impedance = the high side impedance. Then
use the formulas I posted earlier to determine the wattage at 70.7 V.

  #3   Report Post  
Posted to sci.electronics.repair
external usenet poster
 
Posts: 1,630
Default 25V/70V Transformer identification

You got any kind of signal generator ? Feed ot woth that and measure voltage and it is a matter of simple math.

J
Reply
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules

Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
SMD identification: please help! Reinhard Zwirner Electronics Repair 1 December 4th 09 05:25 PM
SMC FET IDENTIFICATION JFP Electronics Repair 0 September 30th 07 07:06 PM
IC identification [email protected] Electronics Repair 1 May 8th 07 03:28 PM
Repairing Grundig cd-player, transformer identification problem [email protected] Electronics Repair 8 April 30th 07 05:35 PM
Using 3ph transformer as single pahse transformer stanley baer Metalworking 5 November 9th 05 05:10 AM


All times are GMT +1. The time now is 03:45 PM.

Powered by vBulletin® Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Copyright 2004-2024 DIYbanter.
The comments are property of their posters.
 

About Us

"It's about DIY & home improvement"