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    電話錄音電路圖/Telephone recorder

    時間:2015-07-15 10:14:55 來源:中國百科網 點擊量:839

    Part

    Total Qty.

    Description

    Substitutions

    R1

    1

    270K 1/4 W Resistor

    R2

    1

    1.5K 1/4 W Resistor

    R3

    1

    68K 1/4 W Resistor

    R4

    1

    33K 1/4 W Resistor

    C1

    1

    0.22uF 150 Volt Capacitor

    Q1, Q2

    2

    2N4954 NPN Transistor

    D1

    1

    1N645 Diode

    MISC

    1

    Wire, Plugs To Match Jacks On Recorder, Board, Phone Plug

    Notes

    1. The circuit can be placed anywhere on the phone line, even inside a phone.

    2. Some countries or states require you to notify anyone you are talking tothat the conversation is being recorded. Most recoders do this with a beep-beep.Also, you may have to get permission from the phone company before you connectanything to their lines.

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        電話錄音電路圖/Telephone recorder

        Telephone Recorder

        This nifty little circuit lets you record your phone conversationsautomatically. The device connects to the phone line, your tape recorder'smicrophone input, and the recorder's remote control jack. It senses the voltagein the phone line and begins recording when the line drops to 5 volts or less.

        Schematic


        Parts