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Old 3rd May 2014, 05:57 PM   #1
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Default Confused with Toroid Transformer

I am trying to get a set of chipamp 3886 boards running, but am having some confusing issues with my transformer. I bought it from Apex Jr a while back, and I believe it is dual 24v, but I'm not 100% sure. It's something around that voltage. The issue I am having is that when I plug it in, I very little output, except between black and yellow. I have not been able to read any resistance, from anywhere on it. Attached are pictures of my measurements.

Could someone please give me some sort of direction of what to try next? I'm stumped.

I have more pics/measurments if needed, these are just a sample.
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File Type: jpg DSC_0209.jpg (966.0 KB, 132 views)
File Type: jpg DSC_0213.jpg (986.6 KB, 128 views)
File Type: jpg DSC_0216.jpg (951.4 KB, 124 views)
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Old 3rd May 2014, 06:00 PM   #2
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I also forgot to mention that there is no hum, or heat produced.
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Old 3rd May 2014, 07:03 PM   #3
sreten is offline sreten  United Kingdom
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Hi,

What does the label on it say ? Red & Blue reading ?

rgds, sreten.
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Old 3rd May 2014, 07:21 PM   #4
Elvee is online now Elvee  Belgium
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Post some more pics. I'd say you have two secondaries (independent): one between yellow and black, and the other between red and blue
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Old 3rd May 2014, 08:34 PM   #5
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That's what I was thinking too, but the readings don't agree. I'll post more pics shortly, I'm just finishing some work on my car that I need to get done, as it looks like rain is on the way.

As for the label, I'll post a pic, but it doesn't give much information.

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Post some more pics. I'd say you have two secondaries (independent): one between yellow and black, and the other between red and blue
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Old 3rd May 2014, 10:11 PM   #6
kevinkr is offline kevinkr  United States
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Are you sure the probe cables fully seated in the meter sockets? These do not appear to be fully plugged in. I have a similar meter which gives nonsensical readings if the probes are not fully plugged in, and the force required to seat them in my meter is significant.
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Old 3rd May 2014, 10:23 PM   #7
Einric is offline Einric  United States
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If you do have a dual 19V secondary you will end up between 24 & 25VDC out of your power supply.
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Old 3rd May 2014, 11:20 PM   #8
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Are you sure the meter is working correctly? You should be able to get continuity between two pairs on the secondary windings. I'd also check the primary for continuity.
Just noticed the NON-INSULATED CONNECTIONS to the primary, that is a NO-NO! I recommend you immediately un-plug from the mains and put wire nuts or at least electrical tape over them. Lethal voltage is nothing to take lightly.

Mike

Last edited by Michael Bean; 3rd May 2014 at 11:24 PM.
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Old 3rd May 2014, 11:31 PM   #9
AJT is offline AJT  Philippines
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yes, safety first......

if that was mine, i will proceed to check it this way..
1. with a dmm set to read continuity audibly, i will check to see
which coils and label them or twist them to signify they are one coil,
2. resistance check to see dc resistances to more or less gauge which
is primary and which are secondaries.
3. having identified the coils, i will get a low voltage ac source such as a filament
transformer and inject say 6 volts onto the coils with lowest dc resistance,
then measure the voltages in the other coils...
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Old 4th May 2014, 12:01 AM   #10
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Fixed it! That was just a quick connection for testing, which I was lazy on, but wire nuts have now been added. And about the meter.... I almost don't want to post this it is such a stupid mistake....

I didn't realize that the red plating on the copper wires was insulating them, and preventing accurate readings. After trying a continuity check for the third time, I noticed a real quick beep when I touched the top of the wires (where there was bare copper). After filing to bare copper on all the wires, I'm now reading much more appropriate voltages.

Can you tell I'm a beginner?

Quote:
Originally Posted by Michael Bean View Post
Are you sure the meter is working correctly? You should be able to get continuity between two pairs on the secondary windings. I'd also check the primary for continuity.
Just noticed the NON-INSULATED CONNECTIONS to the primary, that is a NO-NO! I recommend you immediately un-plug from the mains and put wire nuts or at least electrical tape over them. Lethal voltage is nothing to take lightly.

Mike
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