I just killed two Teensy 3.6 in a row and would rather not turn this into a new habit of mine ...
It seems that it has something to do with a faulty switch, please have a look at the attached schematic. This switch did not close reliably but had a faulty connection. When I touched it, it interrupted the connection briefly - and killed the Teensy. When I took the Teensy out of the circuit and connected it to the USB-cable (only) it got hot.
Could it be, that a short opening creates some spikes or a backflow of current that kills the Teensy? The little amp that is also hooked to the 9V power supply draws about 20 mA.
If so, can I help the situation by adding some diodes in front of the 7805? Or is there any other recommended way about how to create an absolutely foolproof power supply? I have now ordered a Teensy 3.5 for a replacement. Is this design more robust against spikes?
Any tips or advice is highly appreciated!
It seems that it has something to do with a faulty switch, please have a look at the attached schematic. This switch did not close reliably but had a faulty connection. When I touched it, it interrupted the connection briefly - and killed the Teensy. When I took the Teensy out of the circuit and connected it to the USB-cable (only) it got hot.
Could it be, that a short opening creates some spikes or a backflow of current that kills the Teensy? The little amp that is also hooked to the 9V power supply draws about 20 mA.
If so, can I help the situation by adding some diodes in front of the 7805? Or is there any other recommended way about how to create an absolutely foolproof power supply? I have now ordered a Teensy 3.5 for a replacement. Is this design more robust against spikes?
Any tips or advice is highly appreciated!
Attachments
Last edited: