On Fri, 6 Mar 2015 10:34:23 -0800 (PST), you wrote: >Thanks very much for your response Harvey. Right sorry on the mA, I meant >mV. >Also I sent a picture of the circuit to the Adafruit customer support, it's >in that forum thread that I linked to. And they said from looking at it, it >shouldn't have been capable of frying the Bone.
Pictures of the setup help little, except to find an uninstalled wire. The picture you put on the forum shows connections to the strip, but none to the drivers, nor from the drivers to the board. A schematic would be good, as well as the part numbers of the FETS. Otherwise, it's difficult to do anything but guess, although in this case, the guesses might be decent enough. > >I'm surprised I can't find anything similar to this issue. I will check out >the regulators. Even in a relatively simple circuit, the number of ways that a circuit can be miswired is about N! where you count the parts and the wires. And that's just with miswiring, not forgetting something or adding bad parts. Hopefully, you damaged an easily replaceable part. The outputs on this chip are relatively fragile. There are other (perhaps older, perhaps a different design of chip) processors that have more robust outputs. Harvey > >On Thursday, March 5, 2015 at 10:41:17 PM UTC-8, [email protected] wrote: >> >> I wired up a circuit with an LED strip, 3 N-channel MOSFETs, and a >> separate 12V power supply, with the gate pins on the MOSFETS connected to >> I/O pins on the Beaglebone. >> >> When I didn't connect the circuit to the Bone ground, I apparently fried 2 >> boards. Neither will boot up. One gives a flicker on the power light and >> then goes off, and on the other the power light turns on, but the other >> LEDs don't flash and I can't get into either board. >> >> Here is the thread on the Adafruit forum with a photo of the circuit: >> http://forums.adafruit.com/viewtopic.php?f=8&t=69691&p=353330&sid=eff0f5bd69bba9338e6f0ec2d7fa70c4#p353330 >> *The Adafruit support said that setup should not have hurt the board. * >> >> I checked the voltage on the gate pin on each MOSFET that was connected to >> the Bone and it was nominal (~200mA). >> >> Does anyone have any ideas on this? How could this have fried 2 boards? >> >> Thanks for any help. >> >> And PS I posted this earlier today but didn't see it show up in the forum. >> Sorry if it needed to be approved and you are getting a duplicate. >> -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
