m****a
发帖数: 33 | 1 Hi, I can't find a board called electrical engineering so have to post this
question here.
I have a PDA(Tungsten E) that comes with a commercially made AC adaptor(5V
output). Now I want to make one myself that can take DC input. It will be a
simple circuit of LM317 regulator. Then a thought struck me: is there such a
chip in the commercial adaptor? If so, maybe I can just change the adaptor a
bit so it can use DC input also. Can anyone tell me something about this kind
of AC adaptor?
I do want t | M*********m
发帖数: 2024 | 2 After taking a look at LM317, I think you can make changes so that the adaptor
could work as a DC converter. But I guess you need to look up your AC adaptor
manual to see if there is a LM317 inside. There are different regulators used
in the electronics.
kind
I
【在 m****a 的大作中提到】
: Hi, I can't find a board called electrical engineering so have to post this
: question here.
: I have a PDA(Tungsten E) that comes with a commercially made AC adaptor(5V
: output). Now I want to make one myself that can take DC input. It will be a
: simple circuit of LM317 regulator. Then a thought struck me: is there such a
: chip in the commercial adaptor? If so, maybe I can just change the adaptor a
: bit so it can use DC input also. Can anyone tell me something about this kind
: of AC adaptor?
: I do want t
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