有關偵測手提電話訊號..

唔知大家有無見過市面上有一d小飾物..
係電話繩黎既..
掛係手機到..如果部電話一有訊號進出..
例如有電話打黎..sms之類..
就會有粒led閃閃下..

咁我想問偵測手提電話訊號個電路圖係點?
有無朋友有呢個電路圖?
我想diy個= ="

兩粒水銀電, 一個線圈, LED 同埋 IC
買好過自己整啦
附件: 您需要登錄才可以下載或查看附件。沒有帳號?註冊

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原帖由 亞星 於 2008-12-20 21:40 發表
兩粒水銀電, 一個線圈, LED 同埋 IC
買好過自己整啦

I heard that some design no need battery.  Anybody could confirm that and provide the circuit for reference.

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原帖由 WLau 於 2008-12-20 21:47 發表

I heard that some design no need battery.  Anybody could confirm that and provide the circuit for reference.

咁閃燈邊度黎電?大氣電波?

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原帖由 WLau 於 2008-12-20 09:47 PM 發表

I heard that some design no need battery.  Anybody could confirm that and provide the circuit for reference.

the energy emitted by the cell phone is more than enough to lit up a LED, but you need a perfect antenna to capture that little energy from in the air

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原帖由 lamkintai 於 2008-12-20 05:52 PM 發表
唔知大家有無見過市面上有一d小飾物..
係電話繩黎既..
掛係手機到..如果部電話一有訊號進出..
例如有電話打黎..sms之類..
就會有粒led閃閃下..

咁我想問偵測手提電話訊號個電路圖係點?
有無朋友有呢個電路圖?
我想diy個= ="

and FYI, it may not work on CDMA network. (eg, 3G networks in HK)

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原帖由 亞星 於 2008-12-20 21:40 發表
兩粒水銀電, 一個線圈, LED 同埋 IC
買好過自己整啦

有無詳細d

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我都想要個詳細電路

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原帖由 lamtszhin0528 於 2008-12-20 23:27 發表

有無詳細d

落晒膠睇唔到啦

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未睇過有關原理,估應該係咁...
天線收到一定強度既信號,然後觸發IC著左,IC著左之後,保持電力,執行程式(閃燈),time out後熄燈,斷電
注︰綠色部份因設計而異

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