Gainclone power supply transformer - Help!

DJ Exprice · 25th June 2006, 08:40 PM

I went to a recycling center - (my dad knows these guys who work there - the place is probably loaded with well-working transformers and capacitors

) - and was digging through some stuff when I stumbled upon the most beautiful (maybe not visually but it was in GOOD condition) transformer. It's rated at 24v DC (huh? I'll Bridge Rectify it just in case

), 6a (YEEHAW!), and "47-420HZ" for hertz. Thats just it. Does that mean it can take 60HZ or does this mean something else? I really hope so! Thanks!

DJ Exprice · 25th June 2006, 08:42 PM

Picture of scanned sticker on top of the transformer:

EDIT: Sorry about the fuzzy pics. I'm using a cameraphone.

DJ Exprice · 25th June 2006, 08:46 PM

Picture of the transformer:

DJ Exprice · 25th June 2006, 08:49 PM

Another picture of a DIFFERENT transformer that I found at the recycling center:

DJ Exprice · 25th June 2006, 08:51 PM

The other transformer has no markings other than some code on the side. I figured out the primaries and secondaries but the VAC, A, and/(even)or VA are still unknown. I can run some multimeter tests so there shouldn't be any problem

!

DJ Exprice · 28th June 2006, 07:08 AM

Anyone have an Idea?

lgreen · 28th June 2006, 07:22 AM

What's the problem? DC? put your multimeter on it, it probably outputs AC and you can measure the secondaries to see how much you got.

AndrewT · 28th June 2006, 08:25 AM

Hi,
if I am reading your pics correctly, you have a
290VA (6A *24*2) AC transformer.
That works from 47Hz to 400Hz. OK for 60Hz.
Has 2 120Vac primary windings that can be wired for 120Vac or 240Vac
Has two 24 Vac secondary windings that can be wired as centre tapped 24-0-24Vac, or separate 0-24, 0-24Vac, or paralleled 0-24Vac @ 12A.

Check for electrical isolation between all the separate windings and continuity through each winding.

When you first get ready to switch on, use a series light bulb to minimise (eliminate) the damage from a mis-wired connection.

If that VDC is not a typo then it's possible that the secondary voltage is only 17Vac and has been scaled to allow for rectification.

You are a brave (foolish?) man to consider plugging that mains connector into "live" supply on the IEC socket.

DJ Exprice · 30th June 2006, 11:24 PM

Yes, the sticker says 24VDC, not VAC. I have a question though... are the 2 primary windings supposed to read as 0 ohms for connection

?

AndrewT · 1st July 2006, 08:40 AM

Hi,
what scale are you using on your multimeter to record a zero ohms resistance?

25th June 2006, 08:40 PM	#1
DJ Exprice diyAudio Member Join Date: Mar 2006 Location: San Francisco, California	Gainclone power supply transformer - Help! I went to a recycling center - (my dad knows these guys who work there - the place is probably loaded with well-working transformers and capacitors ) - and was digging through some stuff when I stumbled upon the most beautiful (maybe not visually but it was in GOOD condition) transformer. It's rated at 24v DC (huh? I'll Bridge Rectify it just in case ), 6a (YEEHAW!), and "47-420HZ" for hertz. Thats just it. Does that mean it can take 60HZ or does this mean something else? I really hope so! Thanks!

28th June 2006, 07:22 AM	#7
lgreen diyAudio Member Join Date: May 2003 Location: San Diego, USA	What's the problem? DC? put your multimeter on it, it probably outputs AC and you can measure the secondaries to see how much you got. __________________ My DIY audio projects- PartTimeProjects.com.

28th June 2006, 08:25 AM	#8
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Hi, if I am reading your pics correctly, you have a 290VA (6A 242) AC transformer. That works from 47Hz to 400Hz. OK for 60Hz. Has 2 120Vac primary windings that can be wired for 120Vac or 240Vac Has two 24 Vac secondary windings that can be wired as centre tapped 24-0-24Vac, or separate 0-24, 0-24Vac, or paralleled 0-24Vac @ 12A. Check for electrical isolation between all the separate windings and continuity through each winding. When you first get ready to switch on, use a series light bulb to minimise (eliminate) the damage from a mis-wired connection. If that VDC is not a typo then it's possible that the secondary voltage is only 17Vac and has been scaled to allow for rectification. You are a brave (foolish?) man to consider plugging that mains connector into "live" supply on the IEC socket. __________________ regards Andrew T.

1st July 2006, 08:40 AM	#10
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Hi, what scale are you using on your multimeter to record a zero ohms resistance? __________________ regards Andrew T.

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25th June 2006, 08:51 PM	#5
DJ Exprice diyAudio Member Join Date: Mar 2006 Location: San Francisco, California	The other transformer has no markings other than some code on the side. I figured out the primaries and secondaries but the VAC, A, and/(even)or VA are still unknown. I can run some multimeter tests so there shouldn't be any problem !

28th June 2006, 07:08 AM	#6
DJ Exprice diyAudio Member Join Date: Mar 2006 Location: San Francisco, California	Anyone have an Idea?

30th June 2006, 11:24 PM	#9
DJ Exprice diyAudio Member Join Date: Mar 2006 Location: San Francisco, California	Yes, the sticker says 24VDC, not VAC. I have a question though... are the 2 primary windings supposed to read as 0 ohms for connection ?

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