Released the magic smoke!
Jay B. Harlow
Posts: 79
I managed to release the magic smoke on one of the chips I was learning how to use!
Oddly enough I was looking at a book about electronics earlier this week where the author felt you needed to do things like that as part of the learning process. I may get the book so I can release magic smoke properly! :-)
Hopefully the rest of my propeller professional development board is OK. I can replace the one chip, and the propeller if I need to. my concern is the voltage regulators. They and the propeller were notically hot!
I'll need to look at it later, after supper. Remove the offending chip and see if every thing else works...
On a brighter side I was learning how to use my prop scope to study the signal I was trying to create. The digal logic state analyzer looked right (although timing may have been off). The analog signal was all wrong. I made the mistake of hitting the wrong button on the power supply and poof! magic smoke...
Jay
Oddly enough I was looking at a book about electronics earlier this week where the author felt you needed to do things like that as part of the learning process. I may get the book so I can release magic smoke properly! :-)
Hopefully the rest of my propeller professional development board is OK. I can replace the one chip, and the propeller if I need to. my concern is the voltage regulators. They and the propeller were notically hot!
I'll need to look at it later, after supper. Remove the offending chip and see if every thing else works...
On a brighter side I was learning how to use my prop scope to study the signal I was trying to create. The digal logic state analyzer looked right (although timing may have been off). The analog signal was all wrong. I made the mistake of hitting the wrong button on the power supply and poof! magic smoke...
Jay
Comments
If it was a smoke signal you were trying to create, well done!
I saw the smoke come out of the L293 and it "bleed", hey if I'm going to kill a chip I'm going to KILL the chip! ;-)
Although the propeller will "limp" along, its hosed... When its socketed on the board in the voltage regulators become extremely hot, and the propeller becomes quite warm. Without the propeller the voltage regulators stay at room temperature. I'll probably dig out my multimeter later to check voltages...
I'll need to verify my PropScope is OK, as I was watching the waveform on the oscilloscope and the control signals on the logic state analyzer (the DSO LSA tab).
Guess I'll be putting in an order for another propeller chip or two, and 2 or 3 L293s. So if I fry another one ;-) My concern is an unforeseen problem with the board, I won't know until I get a replacement Propeller chip...
How's that saying go: You need to break some eggs if your going to learn to make omlets. I definately could have fried eggs on a couple of chips tonight ;-)
Jay
Jay
I just need to compile my list of parts I need to build the board I want to drive from the propeller...
Jay
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Take a look at DipTrace if you haven't already; Great PCB layout software.
Jay