Strange transformer - 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 1st November 2010, 09:32 PM   #1
db! is offline db!  Canada
diyAudio Member
 
Join Date: Nov 2009
Location: Ontario
Default Strange transformer

I was recently given an oil filled hermetically sealed transformer, probably off some military equipment since "MIL-T-2/A" is written on it.

The primary is rated for 115VAC 3A @ 320-1760CPS which is rather unusual. Would it be okay to run off 115VAC @ 60Hz or will I blow something up?

thanks
  Reply With Quote
Old 1st November 2010, 09:44 PM   #2
diyAudio Member
 
Join Date: May 2009
Location: New Zealand
You will blow it up. (It will overheat.)
It was designed for use in aircraft or similar, they use higher frequency AC, usually 400 Hz, this enables them to use smaller (and thus lighter) alternators and transformers. (The higher the frequency, the less iron you need in the core.)
  Reply With Quote
Old 1st November 2010, 09:55 PM   #3
db! is offline db!  Canada
diyAudio Member
 
Join Date: Nov 2009
Location: Ontario
So, I guess it's pretty much useless practical purposes?
  Reply With Quote
Old 1st November 2010, 11:58 PM   #4
diyAudio Member
 
indianajo's Avatar
 
Join Date: Jan 2010
Location: Jeffersonville, Indiana USA
Default switcher supply

400 up hz transformers are useful for switcher supplies, as cheap as FET's are these days. Look at threads on the amp power supply section, or cut up a dead PC switcher supply and learn from what is in there. Of course for audio, a 400 hz switcher might howl pretty bad into the speaker. The lounge thread "why does NASA sound so bad" has something to say about that. audiopower.it makes audio intended switchers at 87 khz, high enough not to hurt your ears.
__________________
Dynakit ST70, ST120, PAS2,Hammond H182(2 ea),H112,A100,10-82TC,Peavey CS800S,1.3K, SP2-XT's, T-300 HF Proj's, Steinway console, Herald RA88a mixer, Wurlitzer 4500, 4300

Last edited by indianajo; 2nd November 2010 at 12:05 AM.
  Reply With Quote
Old 2nd November 2010, 12:10 AM   #5
db! is offline db!  Canada
diyAudio Member
 
Join Date: Nov 2009
Location: Ontario
Thanks for the suggestion, I was just toying with that idea of building a SMPS that puts out 400Hz! However, this is way beyond my electronics experience; unless there is design that I could easily modify I don't think I'll attempt it.

I am also considering using a sine wave generator and a simple transistor "amplifier" to produce 110vac @ 400hz. Any thoughts on this?

Last edited by db!; 2nd November 2010 at 12:21 AM.
  Reply With Quote
Old 2nd November 2010, 12:41 AM   #6
diyAudio Member
 
indianajo's Avatar
 
Join Date: Jan 2010
Location: Jeffersonville, Indiana USA
Default Easy 400 hz

There are easier ways to do switchers, although I have thought of doing this too with a two transistor phase shift oscillator I built. (I don't have a suitable transformer, so stop there). There is something called the "flyback" circuit that uses a $.15 555 timer IC that somebody recommended for starters on the power supply thread. There are also canned IC's for doing switchers. The Peavey CS800s has a combined oscillator-how are we doing? IC (measures output voltage) ML4825 microlinear corp. They then buffer is with a SG3644 power buffer to drive the switching FET's. See the CS800S schematic on eserviceinfo.com, page 9. I think the PC power supplies I've examined use various optoisolators to relay the "how are we doing' signal to the oscillator IC from the various output voltages.
__________________
Dynakit ST70, ST120, PAS2,Hammond H182(2 ea),H112,A100,10-82TC,Peavey CS800S,1.3K, SP2-XT's, T-300 HF Proj's, Steinway console, Herald RA88a mixer, Wurlitzer 4500, 4300
  Reply With Quote
Old 2nd November 2010, 04:09 AM   #7
db! is offline db!  Canada
diyAudio Member
 
Join Date: Nov 2009
Location: Ontario
Would it be possible to crank up the frequency on a standard 12v - 110v inverter? I have looked into various inverter circuits and unfortunately, they are either too complicated and/or they can't deliver the required power.

This transformer is getting to be more trouble than it's worth I might just take it to the metal scrappers if I don't find a practical way to utilize it...
  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
Strange transformer hum Atilla Power Supplies 12 1st January 2010 02:12 AM
strange sound from transformer when load increased jegandren Power Supplies 8 21st September 2008 11:29 AM
Strange Transformer Question..... wildswan Tubes / Valves 4 25th May 2006 01:32 AM
Strange transformer problem jarkaa Chip Amps 2 9th November 2004 09:00 AM
strange transformer failure mode capslock Solid State 9 27th March 2003 10:58 AM


New To Site? Need Help?

All times are GMT. The time now is 10:12 AM.


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