Quote from: udo on 21 / February / 2017, 10:02:04Our AC-adapter PS700 has an output of 7.4V (2.0A)So we could get way with the MT3608 module as it could deliver 2A's for us at that voltage. (I did see some videos of smoking MT3608 modules, though)If you want to have 7,4V / 2.0 A you need at 5V more than 3A….
Our AC-adapter PS700 has an output of 7.4V (2.0A)So we could get way with the MT3608 module as it could deliver 2A's for us at that voltage. (I did see some videos of smoking MT3608 modules, though)
Hmm.So if we go from 3.7 to 7.4 we need 4A?
Quote from: udo on 21 / February / 2017, 10:44:33Hmm.So if we go from 3.7 to 7.4 we need 4A?Yes… plus about 10% for transferring… but this would be not a problem for the batterie.And I would think, the 2A would be only a peak, not just all the time…
But the MT3608 has an internal limit of 4A.(plus we might run in some heatsinking needs)So would the MT3608 (barely) work?If not: what fatter boost converter would work OK? (higher switching frequency, higher internal limit, etc)
I would buy with first a fake battery with power supply. Then I would cut the cable and measure the current.
How would you measure current? Average current, as measured with a DVM or other ampmeter, will only tell you part of the story. It's the peak currents, that may only occur for a few milliseconds, that determine the power supply needed.
Normally if use my DVM and I have parallel my analog oscilloscope. The average current tells you if you need a heatsinking or not and how long the cam can work with the battery (approximately). The oscilloscope shows me the peak. I never see really peaks in a few milliseconds, but I could miss them on the analog oscilloscope. Peaks can possibly avoid with capacitor.On my G1x I played a little bit with big capacitor but the time where the lens goes out is really long.
Them chinese retailers sell kits consisting of the fake battery (also for M3/M10), some boxed electronics and it all ends in a USB cable to connect to a 5V/2A powerbank.This means that at 7.4 volts the power will only be 1.4 Amps or so.So we should avoid this option?
Quote from: udo on 27 / February / 2017, 09:11:53Them chinese retailers sell kits consisting of the fake battery (also for M3/M10), some boxed electronics and it all ends in a USB cable to connect to a 5V/2A powerbank.This means that at 7.4 volts the power will only be 1.4 Amps or so.So we should avoid this option?Do you have a link of this option?
If he sold it, then I would expect it to work. I would dare to try.
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