Monthly Archives: August 2014

It’s alive

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Solar Stage power indicators running off battery.

Albeit, without any sun out to try charging, but it’s (only the LEDs — note CHGD indicator fail) running merrily off the battery.

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Let’s hope for a break of sun tomorrow.

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On a breadboard somewhere on Planet Earth…

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So after having some trouble with the Solar Stage’s LT4071, I took Greg’s advice and recreated the LiPo charge circuit on a breadboard. I used a proto adapter boards leftover from my attempt at breadboarding the SPV1040 solar boost (see why breadboarding high freq circuits is trouble).
After following the instructions for the charger IC’s eval board, it powered up and switched to supplying the battery through VCC after the power was removed. This was verified by watching impedance of the HBO pin, which went to 0 Ohm when it hit the charge cycle.

Moral of the story: examining sub-circuits is useful and rewarding!

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Filed under Battery power, DIY, ICs, PCB design, Solar Stage, Soldering

Boards arrived!

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Custom board design fabricated by DirtyPCBs.com

My boards have arrived from China, and they’re better than expected! A more in-depth review to follow.

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Poly PV cells arrived

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Polycrystalline photovoltaic cells (1V @ 500mA, 60*60mm) arrived today from a responsive eBay seller. At $2.50 each, they were the cheapest I could find within the spec for the Solar Stage. Took 3 weeks to arrive (Singapore Post). Preliminary tests show they perform well.

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Filed under DIY, Solar Stage