Post by thread:Crystals and Amps

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_OUTspwebTakeThisOuTglobalnet.co.uk

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)

On Fri, 19 Feb 1999 21:55:44 -0000 Sam Powell <.....spwebKILLspam@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? ___________________________________________________________________ You don't need to buy Internet access to use free Internet e-mail. Get completely free e-mail from Juno at http://www.juno.com/getjuno.html or call Juno at (800) 654-JUNO [654-5866]

>>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

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: spwebKILLspamglobalnet.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.

> 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).

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: .....spwebKILLspam.....globalnet.co.uk {Original Message removed}