Many devices have large heat dissipation tabs on them because they are designed to be always be used with a heatsink.·When dealing with large inductive loads you are unsure·of... heat sink the·devices even if you don't think it's needed.··Testing would reveal if they are needed or not and you may·still have Mosfets to test with afterwards versus having Mosfets with the magic smoke that makes them work... released.
·I realize that I might sound a bit negative here, but learning by frying is not a replacement for starting with a good design on paper first.·· By design, I mean take all of "your" real world parameters into account before soldering/breadboading anything.· You seem to be making something relatively simple like motor control harder than it really is.· Your motor load is clearly spiking high enough to burn the devices... but I'm not even sure if you are not introducing a dead short in your circuit, which could easily happen if not well designed and make things go poof instead of spin.
·I'm also really hoping that you get all those mosfets for free.
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There's nothing like a new idea and a warm soldering iron.
Trust me, I know that frying things isn't the best way to go, I figured that out when my BS2 fried.
The problem is I don't have the knowledge to put together a good design on paper ... yet. I'm starting out with this robotics hobby with no understanding of circuits except what I've done with the Boe-Bot and jumped right into this monster project that was probably over my head (but almost finished).
Hopefully by posting my experience here, others starting out can learn from my mistakes and not have to fry anything.
I like your comment about the "magic smoke that makes them work" ... that's a good one... [noparse]:)[/noparse]
Comments
·I realize that I might sound a bit negative here, but learning by frying is not a replacement for starting with a good design on paper first.·· By design, I mean take all of "your" real world parameters into account before soldering/breadboading anything.· You seem to be making something relatively simple like motor control harder than it really is.· Your motor load is clearly spiking high enough to burn the devices... but I'm not even sure if you are not introducing a dead short in your circuit, which could easily happen if not well designed and make things go poof instead of spin.
·I'm also really hoping that you get all those mosfets for free.
▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
There's nothing like a new idea and a warm soldering iron.
The problem is I don't have the knowledge to put together a good design on paper ... yet. I'm starting out with this robotics hobby with no understanding of circuits except what I've done with the Boe-Bot and jumped right into this monster project that was probably over my head (but almost finished).
Hopefully by posting my experience here, others starting out can learn from my mistakes and not have to fry anything.
I like your comment about the "magic smoke that makes them work" ... that's a good one... [noparse]:)[/noparse]