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I had the same problem in central Europe. I checked architecture (32 or 64 bit) with AT+CGMR command and then picked up matching SIM900 firmware, flashed it into SIM900A and now it works fine. You can find details on my blog.
So I have redesigned PCB, got my components and LT3652 is just warm as I made large pads. To my surprise it still was generating 250mA of current util (shamed) I discovered that battery is close to charged, thus resistive enough to not accept more current. This is because I have left the battery...
I have found couple flaws already. First, too small PCB pad for heat dissipation, just twice bigger than MSOP case are - I have designed very large pad now. Next, for high current path I had long tracks and ground incorrectly isolated; new PCB will have Cin/Cout/Df/Rsense/L as close as possible...
I am designing and building device that will work outdoor self-powered using solar panel and battery. Solar panel rated 10W gives Im=0.65A (short-circuit) and has power peak at Um=16.8V (21V open-circuit). The VRLA battery from Yuasa is rated 4Ah 12V (13.65V floating). I followed data sheet and...
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