Print Page - and surprisingly rugged, too!

Title: and surprisingly rugged, too!
Post by: jbeale on October 25, 2013, 01:42:09 AM

Stupidly working too late at night, I connected a 3xAA battery pack to +Vin and GND on my new Moteino in reverse. Bad smell, thumb burned, unit seemed dead.

BUT...! I unsoldered the SOT23 regulator and tried +3.3V from external PS into the 3.3V pin. Unit works OK and the Rx RSSI looks about the same as before. Impressed! The LDO doubles as a fast-acting silicon fuse in case of reverse polarity, at least in this case.

Now I need to have some stock on hand of those SOT-23 regulators...

Title: Re: and surprisingly rugged, too!
Post by: schulz on January 30, 2014, 05:32:13 PM

Sigh. Just did the same thing. Looking through the schematics I can't find any reference to the power regulator.

Anybody have any ideas on how to get this thing back? R4 if that makes a diffference.

Title: Re: and surprisingly rugged, too!
Post by: Felix on January 30, 2014, 05:35:37 PM

MCP1702/3, get it here: http://www.digikey.com/product-detail/en/MCP1702T-3302E%2FCB/MCP1702T-3302E%2FCBCT-ND/1979828

Title: Re: and surprisingly rugged, too!
Post by: schulz on January 30, 2014, 06:03:11 PM

That worked!

Thanks felix and jbeale.

That went from a $20 to a $.50 mistake.

LowPowerLab Forum

Hardware support => Moteino => Topic started by: jbeale on October 25, 2013, 01:42:09 AM