[電機友入] 外置2.5硬碟既USB 供電, 用手機火牛得唔得?

本帖最後由 棋靈王~藤原佐為 於 2012-5-29 02:14 編輯

是咁的, 去旅行唔想帶NOTEBOOK, 但16GB SD卡又唔夠影
想就咁帶iPad連牛 + SD Card Reader + HDD

不過iPad唔夠推隻HDD, 想問HDD個雙頭Y線USB, 有SIGNAL果個插IPAD, 純電果個插iPad牛, 會發生咩事

Sorry我冇咩電機常識, 唔知會發生咩事, 所以問下各位專家

Should be OK, but please make sure the Power Supply is 5V !!

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回復 1# 棋靈王~藤原佐為
Don't even think about it...
This kind of arrangement will likely to cause you more trouble

Bring your notebook.  This is the safest way

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買張大容量卡 , 好過帶 HDD

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一張16gb唔夠, 咪買多兩三張32gb

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千祈唔好咁做
因為Y頭USB線, 兩個插既5V係駁埋既
如果你火牛電壓高過iPad, 火牛D電會谷翻入部iPad, 隨時成部報銷

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回復 6# KinChungE
Good tip
Perhaps another reason why tablet computing is so fragile and should not be exploited

BTW can you explain this
"因為Y頭USB線, 兩個插既5V係駁埋既"?
Does that mean, total VIn becomes 10V?

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回復  KinChungE
Good tip
Perhaps another reason why tablet computing is so fragile and should not b ...
anon893 發表於 2012-5-29 17:47


no
in series先會變10V, in parallel一樣5V
但係假設iPad Output 4.8V, USB火牛5.2V
咁隻牛其實就會feed緊0.4V input倒轉谷入部iPad

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可以用
5V/1A~2A的火牛都可以
iPad火牛規格:5v/2A

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回復 7# anon893


    因為電會由高壓向低壓走
    佢意思係  只要IPAD電壓低過隻火牛,咁D電就會走向IPAD

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