Simple Phone Tap

Author	Views	Views Today	Rank	Comments
Derek Tombrello	77,544	95		63

This circuit is extremely simple, therefore there is less chance of any problems. It can be placed anywhere on the phone line and it will record any conversation on any phone on that line.

Please note: I have received several emails saying that this circuit will not work and that it may hold your line off hook and to me it looks like it will (it would put quite a load on the phone line). For some, it has worked fine. Build at your own risk.

Schematic

Parts

Part Total Qty. Description Substitutions

R1 1 470 Ohm 1/4 Watt Resistor

R2 1 1K 1/4 Watt Resistor

R3 1 100K 1/4 Watt Resistor

R4 1 6K 1/4 Watt Resistor

C1, C2 2 0.01 uF 100V Ceramic Capacitor

K1 1 24VDC Reed Relay

MISC 1 Wire, Headphone Plugs, Phone Plug Or Alligator Clips

Notes

Email Derek Tombrello with comments, questions, etc.

To use the circuit, simply connect it in series to the phone. Then plug in the recorder. It will start recording when the phone is picked up.

The values of R1 and R2 may have to be adjusted, depending on the characteristics of the phone line it is connected to (they vary). If the R1+R2 combination is increased sufficiently (try 2.47K) then the circuit can be connected in parallel with the line, thus covering all attached devices. (Thanks to Mark Wright for the suggestion).

T.A. Betts offers this suggestion for getting this problematic circuit working: "If you drop the resistors and add a 2.2uF capacitor the line will not stay off hook. It blocks the DC from the moniter position."

Related Circuits

Ringing Phone Light Flasher, Phone Busy Indicator, FM Telephone Bug, Cut Phone Line Detector, Simple Phone Tap, Telephone Hold Button, Telephone Recorder, Remote Telephone Ringer

Comments

anonymous Mobile Phone Tap Sunday, May 11, 2008 5:23:32 AM

well i was talkin 2 my frnd over d fone.i was abt to reply to a question wen i heard sum1 cough,quite a loud one.now i know its not me nor my frnd but a peculiar voice.so r der any possibilities of my or my frnds fone being tapped? plz reply..Thanks..
(Editor's notes: First of all, it's spelled: -talking -friend -the -phone -about -when -someone -are -there -friends -please Second, no. )

tarzan mobile phone tap Wednesday, April 23, 2008 10:03:08 AM

want to tap themobile phone which is not mine .plz do tell me the method of how to tap the moble phone through he inter net or i will give u the mobile phone number u can tap the mobile phone and can send in the recordings through the internet in my e- mail and iwill copy it done in the cd and plz do help me out and tell me how to copy the recordings in my cd.urgently waiting for your help.plz do help me out .thanx.

anonymous Simple Phone Tap Sunday, April 20, 2008 9:57:24 PM

Use a voice activated walkie talkie, then connect the speaker of the walkie talkie to the tape recorder.

anonnonymous Simple Phone Tap Friday, April 11, 2008 2:58:38 PM

Can you please let me know what I need to dial from my home phone to check if it's tapped?
(Editor's notes: The number of your local private investigator.)

anonymous Simple Phone Tap Friday, April 04, 2008 10:26:57 AM

I saw on some news show that spoke about a woman who suspected her husband of cheating, the PI was able to...with a simple software program...have her hear EVERYTHING during his day as long as the battery was in...even if it was off! So it is all too possible to do this...but many say that it is not. How can you check for tapped cell phone? Is my question!

anarth telephone hook lift circuit Wednesday, March 05, 2008 7:00:11 PM

Derek, Can u help me build a telephone hook lift circuit. my motive is to detect the ring tone(with a ring detect circuit) and my microcontroller will send a bit to lift the hook of the phone as like in answer machine.

anonymous Cell phone tapping is it possible?... the quick answer ... yes Friday, February 29, 2008 2:46:40 PM

http://www.e-stealth.com/ULTIMATE-BLUETOOTH-MOBILE-PHONE-SPY-SOFTWARE-NEW-EDITION-2008_p_1-8.html just a link I found... same technology that was used by the FBI to tap into the speaker of a phone and use it as a listening device.... not too many ways to figure out if it's being used on you.. however if you find that your battery life is really being depleted a lot more than normal... your phone is probably being used in this way Also type Cell Phone Listening Device into a google search engine... you'll find all kinds

anonymous Simple Phone Tap Wednesday, February 20, 2008 2:12:29 PM

can i dial a number to check for phone tap, from the phone that is tapped

Nytro Simple Phone Tap Thursday, February 14, 2008 2:34:34 PM

I need private information on how to do this myself and also hacking tutorials

starrW Simple Phone Tap Tuesday, January 29, 2008 10:34:28 AM

to a if your ex is tapping your phone, he either has a key to get into your house where the recorder is connected to a phone outlet, or he gets into your attic through an outside access(?) where the recorder is plugged into a phone line. start tracing your outlets and wires until you find where the recorder is.

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anonymous	Mobile Phone Tap	Sunday, May 11, 2008 5:23:32 AM
well i was talkin 2 my frnd over d fone.i was abt to reply to a question wen i heard sum1 cough,quite a loud one.now i know its not me nor my frnd but a peculiar voice.so r der any possibilities of my or my frnds fone being tapped? plz reply..Thanks.. (Editor's notes: First of all, it's spelled: -talking -friend -the -phone -about -when -someone -are -there -friends -please Second, no. )
tarzan	mobile phone tap	Wednesday, April 23, 2008 10:03:08 AM
want to tap themobile phone which is not mine .plz do tell me the method of how to tap the moble phone through he inter net or i will give u the mobile phone number u can tap the mobile phone and can send in the recordings through the internet in my e- mail and iwill copy it done in the cd and plz do help me out and tell me how to copy the recordings in my cd.urgently waiting for your help.plz do help me out .thanx.
anonymous	Simple Phone Tap	Sunday, April 20, 2008 9:57:24 PM
Use a voice activated walkie talkie, then connect the speaker of the walkie talkie to the tape recorder.
anonnonymous	Simple Phone Tap	Friday, April 11, 2008 2:58:38 PM
Can you please let me know what I need to dial from my home phone to check if it's tapped? (Editor's notes: The number of your local private investigator.)
anonymous	Simple Phone Tap	Friday, April 04, 2008 10:26:57 AM
I saw on some news show that spoke about a woman who suspected her husband of cheating, the PI was able to...with a simple software program...have her hear EVERYTHING during his day as long as the battery was in...even if it was off! So it is all too possible to do this...but many say that it is not. How can you check for tapped cell phone? Is my question!
anarth	telephone hook lift circuit	Wednesday, March 05, 2008 7:00:11 PM
Derek, Can u help me build a telephone hook lift circuit. my motive is to detect the ring tone(with a ring detect circuit) and my microcontroller will send a bit to lift the hook of the phone as like in answer machine.
anonymous	Cell phone tapping is it possible?... the quick answer ... yes	Friday, February 29, 2008 2:46:40 PM
http://www.e-stealth.com/ULTIMATE-BLUETOOTH-MOBILE-PHONE-SPY-SOFTWARE-NEW-EDITION-2008_p_1-8.html just a link I found... same technology that was used by the FBI to tap into the speaker of a phone and use it as a listening device.... not too many ways to figure out if it's being used on you.. however if you find that your battery life is really being depleted a lot more than normal... your phone is probably being used in this way Also type Cell Phone Listening Device into a google search engine... you'll find all kinds
anonymous	Simple Phone Tap	Wednesday, February 20, 2008 2:12:29 PM
can i dial a number to check for phone tap, from the phone that is tapped
Nytro	Simple Phone Tap	Thursday, February 14, 2008 2:34:34 PM
I need private information on how to do this myself and also hacking tutorials
starrW	Simple Phone Tap	Tuesday, January 29, 2008 10:34:28 AM
to a if your ex is tapping your phone, he either has a key to get into your house where the recorder is connected to a phone outlet, or he gets into your attic through an outside access(?) where the recorder is plugged into a phone line. start tracing your outlets and wires until you find where the recorder is.