4
The Pi data states 5±0.25V; the MxL7704 PMIC Data states Input voltage range: 4.0V to 5.5V so NO
If your 6V UBEC is producing 8V I would throw it in the bin!
2
You've made a mistake, I'm afraid. You seem to be attempting to switch the relay coil with a GPIO pin. Unless your relay module is designed to use a 3.3V input you are at risk of breaking another RPi.
GPIO pins are for 3.3V - and ONLY 3.3V
In addition, the GPIO pins are delicate little flowers; they won't source (or sink) much current, and they don't ...
2
Unfortunately there are many different relay boards out there using this particular relay but that might feature different driving electronics. So it's difficult to give a definitive answer. There are however some indications that this excellent arcticle /1/ covers this board and the problems the OP describes.
(Image source: /1/)
I leave it to the OP to ...
1
After spending ~ 20 min searching for an actual data sheet on the SH5461AS - and not finding one - I'm of the opinion this is JAPCJ (just another piece of Chinese junk). My best advice is chuck it in the bin & find a part by a reputable manufacturer. There are lots of manufacturers that publish spec sheets (even on parts as old as this one) - here's an ...
1
From the rather unclear photos you have posted the device does not have an opto-isolator but a transistor.
It is unclear why it doesn't work, however there is another type of poor module, triggered by a low level, with a PNP transistor which is not controllable from 3.3V. (This saved the manufacturer some fraction of a cent.)
Without a circuit it is not ...
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