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PICList Thread
'[OT] de-qualified'
1999\02\12@132732 by Reginald Neale

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Chris asked:

>PS.
>Am I still a newbie?, do flashing LED's de-qualify me?.

 Yep, you're full de-qualified now. You've got yer Blinky Merit Badge.
 The next step is the Sparky Merit Badge, as soon as you learn how to
 release the magic smoke from the little buggers.

 Reg Neale

1999\02\12@135205 by Brian

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My first project not only produced magic smoke but made a rather
impressive glo-plug from a windowed part!!!


> >PS.
> >Am I still a newbie?, do flashing LED's de-qualify me?.
>
>   Yep, you're full de-qualified now. You've got yer Blinky Merit Badge.
>   The next step is the Sparky Merit Badge, as soon as you learn how to
>   release the magic smoke from the little buggers.
>
>   Reg Neale

1999\02\12@151740 by Dave Evans

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... and if you follow the previous thread about converting
directly from the AC power mains to DC (without isolation)
you may discover that "smoke test" is sometimes more
than a just a figure of speech.

Dave Evans
spam_OUTdave.evansTakeThisOuTspamdlcc.com

> {Original Message removed}

1999\02\12@154923 by Howard McGinnis

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Smoke? I'm making light bulbs with them - what am I doing wrong?

Howard


At 06:25 PM 2/12/99 GMT, you wrote:
{Quote hidden}

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1999\02\12@190113 by Alan Nickerson

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So far I have never had the smoke come out but I have deformed the plastic
under a PIC on the breadboard.

Alan

{Original Message removed}

1999\02\12@191152 by Alice Campbell

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does this count?
2 16c84s, 1 10k pot, 1 thermistor, 2 irleds, 1 yellow bargraph
display, 1 multivoltage wallwart. possible: 1 33khz crystal.

alice

{Quote hidden}

1999\02\12@191411 by Lynx {Glenn Jones}
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Ive never smoked a micro, but i once hooked a 7805 in backwards and then
after smelling the heat i unplugged the supply and went touching compnents
to find what was up. Ouch! i had a scar in the shape of a TO-220 case on
my thumb for a week :(

------------------------------------------------------------------------------
A member of the PI-100 Club:
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On Fri, 12 Feb 1999, Alan Nickerson wrote:

> So far I have never had the smoke come out but I have deformed the plastic
> under a PIC on the breadboard.
>
> Alan
>
> {Original Message removed}

1999\02\12@191613 by Sean Breheny

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I still think that I could be in the running for worst idea:

       I once tried to make a resistive transmatch out of a pot. I took a regul
ar
(1/2 watt?) pot and hooked it up between my 100 watt HF transceiver and my
antenna, then keyed-down. I think I had the power turned down to around 20
watts,but still,arcing was quite visible inside that pot!
       Yes, I was about 12 years old when I tried this. ;-)

Sean

At 12:08 AM 2/12/99 PST, you wrote:
>does this count?
>2 16c84s, 1 10k pot, 1 thermistor, 2 irleds, 1 yellow bargraph
>display, 1 multivoltage wallwart. possible: 1 33khz crystal.
>
>alice
>

|
| Sean Breheny
| Amateur Radio Callsign: KA3YXM
| Electrical Engineering Student
\--------------=----------------
Save lives, please look at http://www.all.org
Personal page: http://www.people.cornell.edu/pages/shb7
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1999\02\12@194506 by paulb

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Alice Campbell wrote:

> 2 16c84s, 1 10k pot, 1 thermistor, 2 irleds, 1 yellow bargraph
> display, 1 multivoltage wallwart. possible: 1 33khz crystal.

 This sounds like the parts list for something, but what?
--
 Cheers,
       Paul B.

1999\02\12@200845 by Wagner Lipnharski

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Lynx {Glenn Jones} wrote:
>
> Ive never smoked a micro, but i once hooked a 7805 in backwards and then
> after smelling the heat i unplugged the supply and went touching compnents
> to find what was up. Ouch! i had a scar in the shape of a TO-220 case on
> my thumb for a week :(

There is a paint based on liquid crystal that change the color upon temperature,
I know someone that painted all the vital components (IC's, Regulators, Power Sw
itchings...) that he uses on the protoboards/prototypes, so he can identify very
quickly any change
in power consume (and dissipation) on those components, earlier than it can star
t to cause damage... using "nose to touch" and "fingers to smell" (:) is not as
fast as this
solution...  They also sell it in small stripes, so you can glue over the chip.

Why it was not available 20 yrs ago, when I used to calibrate the RF final of tr
ansistored Motorola VHF radio transmitters... fried lots of $40 transistors... b
ecause it was
overtemp for more than a minute.

If somebody is interested in that paint, I can try and find out the info, so you
can protect the PIC and avoid to have the Microchip logo thermo stamped on your
nose for a month.

Chameleon paint anyone?

Wagner Lipnharski
UST Research Inc
http://ustr.net

1999\02\12@211929 by Dan Larson

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I've done that too!

On Fri, 12 Feb 1999 18:58:50 -0500, Alan Nickerson wrote:

>So far I have never had the smoke come out but I have deformed the plastic
>under a PIC on the breadboard.
>
>Alan
>
>{Original Message removed}

1999\02\13@075352 by Alan Nickerson

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You can get it from Edmond Scientific. It's expensive, but probebly worth
it.

Unfortunatly I cannot seem to find my catalog, but I thought of using it for
just this.

Alan Nickerson

{Original Message removed}

1999\02\13@150441 by Sam Powell

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Melting breadboards with PICs (or if your on a budget 555s) is a great way
to minimise case production costs!

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

----- Original Message -----
From: Alan Nickerson <EraseMEanickspam_OUTspamTakeThisOuTIVERSOFT.COM>
To: <PICLISTspamspam_OUTMITVMA.MIT.EDU>
Sent: Friday, February 12, 1999 11:58 PM
Subject: Re: [OT] de-qualified


>So far I have never had the smoke come out but I have deformed the plastic
>under a PIC on the breadboard.
>
>Alan
>
>{Original Message removed}

1999\02\13@193723 by goflo

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Wagner Lipnharski wrote:

> There is a paint based on liquid crystal that change the color upon temperatur
e,

Welding supply stores sell temp indicating crayons - One outfit
that makes crayons also makes a paint such as Wagner mentions.
Tempil-Laq? Different temp ranges available.
Another way to go is a DVM with a temp function. I picked up a
Wavetek 28XT a few years ago. The temp function seemed a bit of
a bell/whistle at the time - Turns out to be useful enough that
I just leave the temp probe plugged in...


Regards, Jack

1999\02\15@055938 by Nigel Orr

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At 20:07 12/02/99 -0500, you wrote:
>If somebody is interested in that paint, I can try and find out the info,
so you can protect the PIC and avoid to have the Microchip logo thermo
stamped on your nose for a month.

Or you could use a slightly dampened cotton bud (Q-tip to USAians?)- but
not near high voltages... listen for the sizzling as it touches the hot
part ;-)

Nigel

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