Re: PCB designer? Weight issues.
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I have a temp controlled soldering station that includes the heat gun for SMD work/rework, and various tip sizes. I also have some awesome indium solder. You are welcome to use it.
There are some great SMD solder videos on Utube. Some use solder paste across the pads, hold the component with tweezers and heat it up with the heat gun and push in place.
0603 components aren't that bad to solder. It's when you get down to 0402 size that they get to be a pain.
On Jul 6, 2017 09:46, "Jared Smith" <jared@...
After realizing the previous charge controller wouldn't work, I decided to design my own. The schematic and PCB renders are attached. This uses the SPV1040 charge controller - http://www.st.com/en/power-management/spv1040.html
- and is generally based on their example board - http://www.st.com/resource/en/application_note/cd00292052.pdf
The board is very small - only 1 inch X .5 inches. The components are mostly tiny 0603 size - so should be a fun challenge to solder. The IC is 3mmX4.4mm.
The S+/- pads are for the small solar cells. I should be able to use 2 of them in series to make ~1.2 volts. The circuit then upconverts this to 5 volts which charges the supercapacitor (CAP+/-) which functions as a battery (except this one works at -40
degrees). It then routes back to V+/- which will go to the Arduino raw power input. Most of the capacitors and resistors are used to set the controller charge values.
There's also a voltage divider on the output that goes to the A connector. This will allow me to measure the output voltage from the Arduino so I don't transmit or turn on the GPS if the voltage is too low.
Feedback or criticism of the design is VERY welcome. I figure I have around 50/50 odds that I designed this in a way that will actually work. I'll order up some PCBs from OSH Park soon and give it a go.
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