Re: Buck converter vs power from Pi question... #12vsupply
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Thanks… but this board is the “hulk” of a board you replaced back a while after the problem occurred. The GPS chip and chips around it got very hot after a cat had knocked the GPS puck off the window casing ledge. I noticed after it was too late that the puck rattles – perhaps something got knocked loose. I bought a replacement puck from you, which did not stop the issue.
I pulled the original Pi3B and the old board out the other day and found that the pi will boot (no hat), but will eventually become heat unstable. It would boot (hat on) while powered from the pi, but not when powered from the DRAWS hat. When it booted (with a configured SD card), the GPS is “unreachable” with the new puck attached. (Puck works on another unit.) That section of the board around the GPS chip warms up again, but not like it did for the failure.
I’ll be happy to send in the board and if we can figure out whether a refurb is possible, you are welcome to return it to service and resell if you think it is worth the trouble. I have two working systems now so I really don’t know what I would do with a third.
Jack Spitznagel – KD4IZ
Cell: (410) 207-5123
Biomedical Consulting Services
From: firstname.lastname@example.org <email@example.com> On Behalf Of Bryan Hoyer
Sent: Sunday, January 31, 2021 19:34
Subject: Re: [draws and udrc] Buck converter vs power from Pi question... #12vsupply
We have had zero failures in the Buck Converter, except for unfused reverse voltage blowing the protection diode. If you power the Pi separately we use the recommended isolation circuit. In fact, I have hot switched between the 2 supplies without problems.
All ICs on DRAWS, including the GPS, operate on the 3.3V supply, which is provided by the Pi. We have had zero GPS failures, we did have an I2C to serial failure on 1 unit. The GPS receiver is on the I2C serial port.
Email me at sales@... and I’ll arrange for a refurb unit for you.