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PICList Thread
'Crystals and Amps'
1999\02\19@170104 by Sam Powell

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Is it poss. that with around (no ammeter conected at the time) about a 1/4
of an amp going through i crystal it could start to behave erativally? Not
blow all together but to occasionaly execute a few instructions?

Or is it more likely that the (hardy at worst of times) pic was damaged...
(it did melt through the breadboard)

ICQ: 23977120
E-Mail: spam_OUTspwebTakeThisOuTspamglobalnet.co.uk

1999\02\19@171002 by Alice Campbell

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does this qualify sam for a 'sparky'?


> Is it poss. that with around (no ammeter conected at the time) about a 1/4
> of an amp going through i crystal it could start to behave erativally? Not
> blow all together but to occasionaly execute a few instructions?
>
> Or is it more likely that the (hardy at worst of times) pic was damaged...
> (it did melt through the breadboard)

1999\02\19@200629 by Mike Keitz

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On Fri, 19 Feb 1999 21:55:44 -0000 Sam Powell <.....spwebKILLspamspam@spam@GLOBALNET.CO.UK>
writes:
>Is it poss. that with around (no ammeter conected at the time) about a
>1/4
>of an amp going through i crystal it could start to behave erativally?
>Not
>blow all together but to occasionaly execute a few instructions?
>
>Or is it more likely that the (hardy at worst of times) pic was
>damaged...
>(it did melt through the breadboard)

It's hard to burn out a crystal in a typical PIC circuit.  If the crystal
were damaged it would probably refuse to oscillate at all.  More liely,
the PIC is damaged.  Why not replace both and see if the problem goes
away?


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1999\02\19@204709 by Reginald Neale

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>>Is it poss. that with around (no ammeter conected at the time) about a
>>1/4
>>of an amp going through i crystal it could start to behave erativally?
>>damaged...
>>(it did melt through the breadboard)
>


 The next jr. achievement level above the "sparky" is the "slaggy."
 This is where you fuse the entire project into a molten mass of
 metal, plastic and silicon. Extra points if you mount the cinder
 on a trophy stand afterwards.

 Reg

1999\02\19@235313 by dave vanhorn

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At 09:55 PM 2/19/99 +0000, Sam Powell wrote:
>Is it poss. that with around (no ammeter conected at the time) about a 1/4
>of an amp going through i crystal it could start to behave erativally? Not
>blow all together but to occasionaly execute a few instructions?
>
>Or is it more likely that the (hardy at worst of times) pic was damaged...
>(it did melt through the breadboard)
>
>ICQ: 23977120
>E-Mail: spwebspamKILLspamglobalnet.co.uk


If you got 250mA through a crystal, it has died and gone to heaven.
And likely the rest of the circuit as well.

1999\02\19@235950 by dave vanhorn

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>  The next jr. achievement level above the "sparky" is the "slaggy."
>  This is where you fuse the entire project into a molten mass of
>  metal, plastic and silicon. Extra points if you mount the cinder
>  on a trophy stand afterwards.
>
>  Reg


We had an eprom gang burner once, it would do 8 at a time, and three were
usable.
Three would be dead, and two would be cracked in half, or melted into the
sockets.

I did melt an eprom once (ceramic case).

1999\02\20@171326 by Sam Powell

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Well... a quick ~(failed) varify produced lots of garbage so I reprogrammed
the PIC, and no problem! (apart from the B/board which is properly fried...

ICQ: 23977120
E-Mail: .....spwebKILLspamspam.....globalnet.co.uk

{Original Message removed}

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