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Old 11th April 2008, 02:46 AM   #31
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Default Re: Voltage at my speaker terminals?

Quote:
Originally posted by bsmif
Just wired up my first gainclone (one of Peter's 3875 kits). For some reason the negative voltage is coming off the positive connections of the powersupply board and vice versa. It was hooked p this way briefly before I turned it off, tested the leads and switched them. (seemed easier than flipping the diodes or trying to figure out what I did wrong on the PSU. SO Now one channel works fine while the other has -27 volts at the speaker terminals. Also has -1.2V at the input. Any idea what I did wrong? What I am likely to have blown out by having the wrong voltage hooked up briefly?

That is the elegant "rows" design for rectifier, so start at V+ and arrange the diodes so that the "|" faces V+ for all of the diodes.
You can (should) test the rectifier board before connecting the amplfiers.
Here's a picture for reference of diode polarity:
(see attached photo)

Perhaps the next step is to double-check the transformer hookup.
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File Type: jpg mur860 002.jpg (31.9 KB, 578 views)
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Old 11th April 2008, 05:07 AM   #32
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The diodes should be installed as in attached pic (the stripes mark the metal tabs):
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Old 30th May 2010, 09:52 AM   #33
cdesign is offline cdesign  Netherlands
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Quote:
Originally Posted by Peter Daniel View Post
The diodes should be installed as in attached pic (the stripes mark the metal tabs):
So, this one (post #6)
http://img244.imageshack.us/img244/4342/wiring1ra.jpg
is not correct?
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Old 31st May 2010, 03:12 AM   #34
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Quote:
Originally Posted by cdesign View Post
So, this one (post #6)
http://img244.imageshack.us/img244/4342/wiring1ra.jpg
is not correct?
Yes, I believe those diodes in that post are not correct.
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Old 16th February 2013, 01:06 AM   #35
JonGain is offline JonGain  United States
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that picture needs to be wiped from the internet........
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Old 16th February 2013, 02:32 AM   #36
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Quote:
Originally Posted by JonGain View Post
that picture needs to be wiped from the internet........
yeah! those diodes were put the wrong way!!! There are black lines on the board that are the metal side of those diodes, as Peter explain in the post above.
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