Accidentally hit Vin with 7-8 volts. Should I consider the board a loss? (Teensy 4.0)

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piere_delecto

Member
I inadvertantly installed an L7805 voltage regulator backwards while powering the circuit from an external 9 V supply (I cut the trace between USB power and Vin, in case that matters). The “5 V” rail ended up around 7–8 V and now my muxes/shift registers seem fried. The Teensy 4.0 *does* still run a basic onboard LED blink that I inserted in setup() but I'm currently not able to test much else.

Should I assume the Teensy 4.0 and/or Audio Board are likely damaged too? Do either have built-in overvoltage protection? Project is for a friend and I don't want him to have problems down the road.
 
There's no over-voltage protection. If the project is important, I'd use new parts that haven't been abused.

If the old hardware still seems to work, maybe save it for a less important project. Or if you've used it for a long enough without seeing any problems, maybe enough time can build confidence that it's probably still reliable.

But if you have a really important project you really need to work reliably soon, I'd play it safe with new hardware.
 
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