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Old 11th April 2008, 05:42 PM   #1
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Default What a doofus!

Hello again

Whilst soldering two of the diodes I found the solder did not bond with the PCB (dirty contact). I ended up by applying too much heat to the board and have ended up damaging the copper pad.

Can I carefully solder this diode on the component side? Or is there a way of repairing the contact.

Tripmaster
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Old 11th April 2008, 05:48 PM   #2
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Here are some other photos
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File Type: jpg psu.jpg (38.1 KB, 715 views)
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Old 11th April 2008, 06:24 PM   #3
49 - for the 18th time
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Hello Tripmaster - you are looking for a circuit repair kit that is somewhat like this - http://cgi.ebay.com/PACE-CIR-KIT-Pri...QQcmdZViewItem
This kit is for repairing circuit traces as well as plated through holes and from reading your description I think the only thing you will need is the eyelet repair part of the kit. The one listed is in USA so you are most likely better off looking for something in GB - (although the dollar is low). Take a look at the photo's in this ad and you will see one of them that shows an eyelet being set into a PWB. Not difficult with the proper tools and a gentle touch. Hope this helps
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Old 11th April 2008, 06:49 PM   #4
Puffin is offline Puffin  United Kingdom
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Tripmaster. I have one of these Chipamp.com boards. If you look at the track to which the diode is attached, you will see that the diode above it (on your photo, and next to the board edge), one leg is connected to the same track. Just solder a wire from the (right, according to your photo) leg and the right leg of the diode above. That leg of the diode will not be attached to the board,but it will still work.

Alternatively just scrape away some of the lacquer on the track to expose the copper track and connect a piece of wire from the exposed track to the leg.

Where in Hampshire are you ?
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Old 11th April 2008, 09:19 PM   #5
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Hayling Island, Nr Portsmouth
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Old 12th April 2008, 06:43 AM   #6
Puffin is offline Puffin  United Kingdom
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Tripmaster. I am about 30 mins up the A3. If you can't get it sorted, perhaps we can get together ?
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Old 12th April 2008, 06:55 AM   #7
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Yes, why not.

Do you live near Petersfield?
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Old 12th April 2008, 09:32 AM   #8
Puffin is offline Puffin  United Kingdom
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The other side of Haslemere.

Here is what I suggest you try

http://i73.photobucket.com/albums/i2...sex/ChipBD.jpg
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Old 12th April 2008, 10:39 AM   #9
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Thanks Puffin

Should I use the same wire that I plan to connect the PSU to the amps? I think it's 0.4mm

What have you used for your enclosure? I have two 300va 2x25 transformers
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Old 12th April 2008, 10:50 AM   #10
AndrewT is offline AndrewT  Scotland
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Quote:
Originally posted by Tripmaster
I have two 300va 2x25 transformers
Hi,
is that 230:25+25Vac or 240:25+25Vac?
You are getting very close to maximum ratings for 8ohm speakers.
What is the maximum PSU voltage when the mains is @ 254Vac? i.e. +6% tolerance.
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