Electronics > Beginners
Conversion of a beard trimmer from nimh to Li-ion
downloaders:
I'm an electronics enthusiast (so I don't REALLY know what I'm doing) but think my idea will work, but as usual when dealing with an idea for the first time, there is always room for improvement ;D
The motivation for this is my new trimmer is not half as good as this one was, so I decided to resurrect it.
The trimmer I have is a philips QT4022, and somehow when its fully charged (I swapped the original aaa with eneloops and charged them inside AND outside the unit) it blinks amber (sign for empty battery)
In a nutshell, this is my plan:
Notes:
- The button is a momentary push switch and I would like to keep it, that's the reason for the push switch circuit
- 2 aaa's would be around 3v I guess, that's why I went for the 3v output (correct me if I'm wrong)
Step down: https://www.ebay.com/itm/272666856859
Switch Circuit: https://www.ebay.com/itm/172993257617
Any suggestions for other circuits are welcome, as I just picked them because they suited the needs and they are maybe not the best for the job.
Is there something wrong with my plan, or any way to improve it or make it simpler?
Thanks
james_s:
I would suggest looking for a lithium iron phosphate cell instead, they are around 3.6V instead of 4.2V and should work fine powering the motor directly and if you get an internally protected cell you can dispense with the separate protection against over-discharge. Small DC motors like that will work well over quite a wide voltage range usually.
Audioguru:
where is the Li-ion battery charger circuit?
downloaders:
@ james_s: A lifepo4 would be better, but I have none, have a ton of 18650 around and where i live it would be expensive to get one. Or do you mean the circuit doesn't work this way and that is the only option?
@ Audioguru: The charging would look something like this:
I suppose it should work, but i'm not sure.
Audioguru:
Your charger looks like it is designed for AA Ni-MH cells, not Lithium-Ion cells. The charger circuits are completely different.
Correction; I looked up your Banggood Chinese battery charger and it might be very good if it does not fail soon.
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