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1

With a 100% efficient power conversion from 3.7 volts to 10 volts, any current taken from the boosted 10 volts will be seen as 10/3.7 (2.702) times as much on the battery so, it's probably better to just consider the battery capacity as unchanged but, in these circumstances it will be dispensing 2.702 times as much current. Given that the efficiency of a ...


0

The battery capacity does not change, it will stay 750mAh. It's the current taken out of battery that will change, so that changes how long it can drive the LEDs. 9V×30mA is 270mW load. Assuming the boost converter has 100% efficiency (it won't), there is 270mW taken out of the battery. At 3.7V that is 73mA so 750mAh/73mA is only about 10h.


1

It will depend on the details of your coffee maker. If all it does is boil the water into steam and let the steam pressure do the work, then it will not likely care about the frequency, or the voltage for that matter. if it has electronics in it, most electronics now use what are called "Switch Mode Power Supplies" that can accept any frequency at ...


0

PAM8403 is 2x3W so 1.200mA, not like mentioned above 3x3W. Instead of using this: CE8301A, you should probably use: HX3608, AP2007SPER or smth. like this: MST9225BKP, SE3608, TPS61085DGKR, ME2159AM6G...


1

It will work fine -- this is basically the way all systems in your house are connected -- the primaries of the individual transformers are in parallel (i.e. plugged into the mains), and the secondaries are all separate.


4

Yes it can be done, however it may be more economic to use a single autotransformer with multiple taps.


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