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Old 27th November 2006, 07:46 PM   #731
D1GGY is offline D1GGY  New Zealand
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Hi Russ,

I think i will put this down as a test Mule and retire it!

Look out for a nother order on the website as i do not have the ability program the PIC, additionally i do not have the test equipment to work through the other items and would probably end up chasing my tail.

This is what comes from trying to solder with a screeming ten day old boy in the same room!!

cheers, mark
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Old 27th November 2006, 09:05 PM   #732
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Ouch... The attenuator chip is such nice thing to let the magic smoke out of.


On the NEXT one you build you might want to employ a power up method common in PCB Kit building instructions.

Build the power supply section first and without ANY other IC's installed... check the voltages. If they are good... *then* continue knowing that you won't fry anything when you power up.
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Old 27th November 2006, 09:38 PM   #733
D1GGY is offline D1GGY  New Zealand
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The attenuator chip didn't even give me that much entertainment , A puff of smoke would have been something!

cheers i will do the power side of things first in future, i guess i was lucky with the Rev C ----- built it ----switched on ---- great sound haa haa haa

I am not used to small voltages and micro amps, I normally work on High Voltage networks and many Hundreds of amps......Scary to think about really.....

what is the best method for desoldering, sucky thing or braid?

Oh and thanks Brian......

mark
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Old 27th November 2006, 09:41 PM   #734
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Quote:
Originally posted by D1GGY

what is the best method for desoldering, sucky thing or braid?


mark
A desoldering pump works nicely, braid works well too, but I mostly use that for SMD devices and such.
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Old 27th November 2006, 09:43 PM   #735
D1GGY is offline D1GGY  New Zealand
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Cheers i will give it a go with the solder sucker then.....

M


SMD now that sound like fun.....what with my eyesight !!
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Old 27th November 2006, 10:39 PM   #736
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You'd be surprised what can survive this type of mistake. I made several big ones on mine and only ended up frying my PIC. I had switched the LM812 and 912. Just swapping them corrected things w/o any damage. I also connected the transformer to the pot connector. That fried the PIC, but everything else was A-OK.
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Old 27th November 2006, 11:12 PM   #737
D1GGY is offline D1GGY  New Zealand
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Thats good to hear,

I still do not understand why i messed it up in such a spectacular manner, still nothing actually went bang!

I have had a mad couple of days and have really thrown some abuse at it

> I have applied over voltage to it through incorrect primary wiring

> Inverted voltage applied to it due to reversed voltage regulators

> Goodness only knows through incorrect bridge configuration

> Loads of temperature from my soldering iron in futile attempts at desoldering....

all good fun though, and will be fixed, just glad i did not attach my Senn HD25's to it......
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Old 28th November 2006, 02:11 AM   #738
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Ummm Could Twisted Pear maybe use you as a tester? You know, like the way they used to show us how AT&T would stress their phones to be sure they would hold up under normal use?

I prefer the SOLDER SUCKER, myself. I've had a EDSYN DS 017 (AKA SOLDAPULlT) since 1978 and it STILL does an excellent job. The board might be saved if you try.

Good Luck
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Old 28th November 2006, 02:15 AM   #739
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Emergency parts are already on the way...
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Old 28th November 2006, 02:21 AM   #740
D1GGY is offline D1GGY  New Zealand
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Lightbulb I think I need more sleep actually......

I think I have demonstated how robust the Twisted stuff is to abuse, I am in no doubt that it will be up and working soon.

I am more than happy to test future products for idot proofing!!!

I really do not know what happened here, I do not normally suffer in this maner.

As Testament, my solder sucker is from my apprenticeship days as a prototype wireman and is still going strong. With the above public demonstration it would have been lucky to have lasted 6 months

I am hopeful that the board is recoverable and intend to have it partnered with my Rev C's in due course.

Cheers, M
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