Post by thread:[OT] de-qualified

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

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

... 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.evansTakeThisOuTdlcc.com > {Original Message removed}

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}>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 > > --------------------------------------------------------------------- Howard McGinnis Electronic Visions, Inc .....hmcginniKILLspam@spam@digital.net 1650 Barrett Drive (407) 632-7530 Rockledge FL 32955 FAX (407) 632-3396 http://ddi.digital.net/~hmcginni

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

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: 3.1415926535897932384626433832795028841971693993751 058209749445923078164062862089986280348253421170679 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}

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 shb7KILLspamcornell.edu Phone(USA): (607) 253-0315 ICQ #: 3329174

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

Melting breadboards with PICs (or if your on a budget 555s) is a great way to minimise case production costs! ICQ: 23977120 E-Mail: .....spwebKILLspam.....globalnet.co.uk ----- Original Message ----- From: Alan Nickerson <EraseMEanickspam_OUTTakeThisOuTIVERSOFT.COM> To: <PICLISTspam_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}

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

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