PINE64
5V will fry it - Printable Version

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+--- Thread: 5V will fry it (/showthread.php?tid=3437)



5V will fry it - kissste - 02-16-2017

I have managed to fry one, by accidentally connecting it to 5V rails.

For ... just a few seconds, till I have realized that it might be a reason why it is not booting, but it was too late already.

Lesson learned.

I have immediatelly soldered MCP1700T-33 linear regulator with a low dropout on the next one.
(it needs a capacitor to work properly once PADI connects to wifi, I guess, current spikes beyond it's capability)

Suggestion - add small pads for a regulator to be soldered on, to the adapter board. Like on the ESP8266 adapter board, there are pads, an 0 ohm resistor is bridging V-in and V-out by default.


RE: 5V will fry it - MarkHaysHarris777 - 02-16-2017

(02-16-2017, 06:34 AM)kissste Wrote: I have managed to fry one, by accidentally connecting it to 5V rails.

<snip>

Suggestion - add small pads for a regulator to be soldered on, to the adapter board. Like on the ESP8266 adapter board, there are pads, an 0 ohm resistor is bridging V-in and V-out by default.

The breakout board is designed to be plugged into a standard breadboard.  The breadboard power supply has dual switchable 5v|3v3 rails ;  consequently regulator is not necessary on the breakout board.  I am adding a 3v3 regulator and decoupling cap(s) to my Arduino shield;  although the Arduino has 3v3 available, I want dedicated supply.  The production shield will not use the breakout board at all.


RE: 5V will fry it - kissste - 02-17-2017

@marcushh777  Yes, you have a valid point, regarding the breakout board being designed for a standard breadboard. But, extra pads, would be handy, eventually a project moves from a breadboard to a project box or it will end up being integrated into another device. (Hobby perspective).

Handy overview of 3.3V up to 500mA regulators:
https://docs.google.com/spreadsheets/d/1ESbsihzf1ICR4KV9eZwzpxShr41XT5JThNfK_x_9GDc


RE: 5V will fry it - pfeerick - 02-17-2017

(02-17-2017, 06:05 AM)kissste Wrote: But, extra pads, would be handy, eventually a project moves from a breadboard to a project box or it will end up being integrated into another device. (Hobby perspective).

I second that. I do a lot of breadboard stuff which has a single supply (typically 5v), so having the pads for a LDO linear regulator would be a great addition to the board. All the 3.3v stuff I use has been picked for having on-board regulation/level-shifting, so I don't have to add in a second supply, or use specific multi-voltage boards.


RE: 5V will fry it - dkryder - 02-17-2017

it would be an innovative addition to the breakout, which is based on feedback from the community which would not be all that difficult. this is the type thing that pine64 needs to foster if they are truely interested in being part of the maker scene. the ole "you asked for it, you got it" type mindset put to work on small improvements.