Ah, this is not uncommon. A lot of AVR Dragons were slain for the same reason. Touching the regulator affects its feedback and therefore its output voltage. A tiny ESD, not enough to cause any damage, can drive the output high for enough milliseconds to cook a 3.3V IC downstream.
On Wednesday, December 9, 2020 at 3:33:06 PM UTC-8 nixiebunny wrote: > The voltage feedback resistor is a low impedance node on every voltage > regulator design that I have worked with. Typically 1k ohm. I don't see how > that could happen. > > > On Wed, Dec 9, 2020, 12:30 PM newxito <[email protected]> wrote: > >> I just wanted to share something that happened to me yesterday. I killed >> the ESP32 on my nixie board just by touching the adjustable voltage >> regulator IC with one finger. I’m pretty sure that I touched the feedback >> pin causing the voltage to increase. >> I already changed the design, and, in the future, I will only use >> regulators with fixed output voltage. I hope they are less sensitive. >> >> -- >> You received this message because you are subscribed to the Google Groups >> "neonixie-l" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected]. >> To view this discussion on the web, visit >> https://groups.google.com/d/msgid/neonixie-l/363b5739-77ec-4557-8728-28899df4430an%40googlegroups.com >> >> <https://groups.google.com/d/msgid/neonixie-l/363b5739-77ec-4557-8728-28899df4430an%40googlegroups.com?utm_medium=email&utm_source=footer> >> . >> > -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/e5861077-7186-436c-88cc-60564eec6e88n%40googlegroups.com.
