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💬 Tiny Solar Charger for 2.7v Mote Supercap

openhardware.io last edited by openhardware.io

https://www.openhardware.io/view/382/Tiny-Solar-Charger-for-27v-Mote-Supercap
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NeverDie Hero Member last edited by NeverDie

If you wish, you may substitute S-1313 ( http://datasheet.sii-ic.com/en/voltage_regulator/S1313_E.pdf) for the MAX8887EZK27 LDO
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What is the max ampere capacity of 3.3V battery it can charge ? Is there any upper limit like 1000mAh or 3300mAh like that ?
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@Mishka Anything new?
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@Mishka Ah yes, that is true. In this case though I went out of my way to keep the PCB dimensions as small as possible so that someone could have it made at OSH-PARK for super cheap--just $0.30 per board. If I ever figure out how to post a complete set of KiCAD files, then I guess maybe then everyone can modify it to suit their circumstances. Until then, it will be hard to have one's cake and eat it too.
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Right you are. Live and learn (even at 81), and I even learned a new word -'vias.' Thanks.
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@rozpruwacz said in 3.3v Boost Converter with Pass-Through: Hi, I just came across this project and I like the idea of pass trough very much I have a question, why did You use the LTC3525D part instead of MCP1640C which You already used in other boost converter projects ? MCP1640C is 5 times cheaper than LTC3525D and they are quite similar. I just now revised the board to expose the Enable pin, so now you can do a pass-through if you wish. I also made it more compact and gave it a ground-plane on the back. https://www.openhardware.io/view/279 Enjoy!
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@ceech I really like this design, however I think it has a problem: According to the datasheet the TPS610986DSET has no feature to disconnect the load at low battery voltages. I think the result will be that e.g. a ESP32 or other power hungry chips will not power up properly. The TPS63031 might therefore be a better fit. btw.: Do you still sell assembled versions of this design? Would you be willing to create a new version with the TPS63031 and probably also with 10 or 20F capacitors or an board to solder your own capacitors. Best regards Tobias
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@Roland-Wijnen JLCPCB.com seems pretty happy with the files. Its rendering of the completed pcb looks correct, and they'll ship me 5 copies of the board for less than $10 US, including the shipping price. Seems like a plenty cheap price. I haven't made this board with them, but I've used them plenty of times in the past, and when they render a board correctly on the portal, it always comes out correct when I get it in my hands. (Well, other than design mistakes - they make it just how I design it, but that's a different story.)
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Anyone good with SPI channel analysis? Hardware SPI (Looks great): Software SPI (Same setup, just changed code and pins). In the first, I can clearly see MOSI and MISO communicating on 5/6. Enable on 7. Software SPI does not make any sense.

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