Reverse polarity fix

[SoxxZ]

Hi, just fried my V1.1 board i won on the giveaway by accidentally putting a reverse polarity into it, and want some help on where to look to find the fried components. Thanks in advance!

73 de PP2SOX

[Neitron4ik]

In fact there is polyfuse in schematics, so it should recover. But in some cases it can be desoldered itself...
Try to check components in this part, if you are lucky) :
https://dl2man.de/wp-content/uploads/20 ... _1_2-1.pdf

input circuit

trusdx_wrongpolarity.png (20.25 KiB) Viewed 200 times

For improvement, I recommend to use diode in series of positive pole, to have better protection in wrong polarity cases. Power current is not so high, yes better solution is to use mosfet in diode mode, with almost zero loss.

[DL2MAN]

He has a Rev 1.1 Board, which does not have those reverse polarity protection parts.

So:
Replace the burnt parts and start working from there.
If you´re lucky it´s just the 2 capacitors.

If you´re unlucky, you need to change some IC´s.
Basically every IC and even PA FETs can be affected.
Depending on for how long and how much current was involved....

73 Manuel; DL2MAN