dc volts - Page 2

AndrewT · 9th August 2009, 12:14 PM

something is either wired wrongly or some component/s is/are inserted incorrectly and/or damaged.

Build that bulb tester, even the simple one without any switches and power your project from the bulb tester.

mike dodd · 9th August 2009, 06:09 PM

Hello again,
Sorry I missed yesterday's posts. I had to get some work done out in the woods. We had some cool weather and had to work on fire protection. Anyway back to the thread. Pulled of the caps, there is both very low dcv and about 26vac. I just checked the diodes again, and am getting low voltage both ways. .945v pos. lead to anode, and .415 neg. lead to anode. This is probably the problem. I will make a light bulb tester before I move on.
Thanks Mike

AndrewT · 9th August 2009, 06:29 PM

Quote:

Originally posted by mike dodd
Hello again,
Sorry I missed yesterday's posts. I had to get some work done out in the woods. We had some cool weather and had to work on fire protection. Anyway back to the thread. Pulled of the caps, there is both very low dcv and about 26vac. I just checked the diodes again, and am getting low voltage both ways. .945v pos. lead to anode, and .415 neg. lead to anode. This is probably the problem. I will make a light bulb tester before I move on.
Thanks Mike

and here again he plugs in some known faulty equipment and continues to take measurements.
Ask for help and ignore the advice you are given.
Is this the way to get further help?

Stuey · 10th August 2009, 03:45 AM

Howdy Mike,

I can't quite make out where you're measuring, but if that's what's on the rails before the caps but after the diodes, it sounds like the diodes are knackered. Is there a possibility you overheated them when soldering?

From memory, though, these boards don't suck out much heat so you shouldn't have needed to use too much to get solder flowing. This is mainly a problem when you're soldering to a board with a fairly big copper trace, or a plane of copper. This pulls the heat out of a smaller tip.

Photos of your work showing the transformer wiring and both sides of the PSU board would may help. You'd be surprised what people on here can spot!

Stuey

9th August 2009, 12:14 PM	#11
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	something is either wired wrongly or some component/s is/are inserted incorrectly and/or damaged. Build that bulb tester, even the simple one without any switches and power your project from the bulb tester. __________________ regards Andrew T.

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9th August 2009, 06:09 PM	#12
mike dodd diyAudio Member Join Date: Aug 2009	Hello again, Sorry I missed yesterday's posts. I had to get some work done out in the woods. We had some cool weather and had to work on fire protection. Anyway back to the thread. Pulled of the caps, there is both very low dcv and about 26vac. I just checked the diodes again, and am getting low voltage both ways. .945v pos. lead to anode, and .415 neg. lead to anode. This is probably the problem. I will make a light bulb tester before I move on. Thanks Mike

10th August 2009, 03:45 AM	#14
Stuey diyAudio Member Join Date: Mar 2006 Location: Perth, Western Australia	Howdy Mike, I can't quite make out where you're measuring, but if that's what's on the rails before the caps but after the diodes, it sounds like the diodes are knackered. Is there a possibility you overheated them when soldering? From memory, though, these boards don't suck out much heat so you shouldn't have needed to use too much to get solder flowing. This is mainly a problem when you're soldering to a board with a fairly big copper trace, or a plane of copper. This pulls the heat out of a smaller tip. Photos of your work showing the transformer wiring and both sides of the PSU board would may help. You'd be surprised what people on here can spot! Stuey

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