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  • tm3 commented on TrầnB's instructable BLADELESS FAN3 weeks ago
    BLADELESS FAN

    Not blade-less, but this Dysons fault as they call theirs blade-less when it uses the same principle! Well done on a recyclable version.

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  • tm3 commented on webgeeks's instructable DIY Wireless Charging Power Bank1 month ago
    DIY Wireless Charging Power Bank

    Yes, a very nice module that still only takes a 3.7V LiPo battery and not the 7.4V that was being suggested. Does anyone produce a battery charging circuit that runs on both series and parallel connected batteries that is cheap? The circuitry involved would be too complex for series and parallel operation. There is also the issue of parallel battery seesaw drain when connecting multiple batteries in parallel. There should be a 3 pole switch to disconnect each battery when not in use or they will self discharge.The battery seesaw effect is when the very minute difference in terminal voltage causes the higher battery to discharge into the smaller and overshoot the terminal voltage, then the cycle reverses to the new higher voltage until all batteries discharge.

    the 3 batteries are in parallel. Each is 3.7V at 2200mAh. This gives 3.7V at 6600mAh, so a larger capacity and not a higher voltage. To increase the voltage with the same capacity would require 3 extra batteries not 1. Also, how would you charge the extra batteries front a 5V USB input?

    the 3 batteries are in parallel. Each is 3.7V at 2200mAh. This gives 3.7V at 6600mAh, so a larger capacity and not a higher voltage. To increase the voltage with the same capacity would require 3 extra batteries not 1. Also, how would you charge the extra batteries from a 5V USB input? This current solution is the most elegant and compact.

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