电话录音电路图/Telephone recorder
时间:2015-07-15 10:14:55
来源:中国百科网
点击量:717
Part
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电话录音电路图/Telephone recorder |
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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
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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.