Telephone Recorder

Home > Circuits > Telephone > Telephone Recorder

Author	Views	Views Today	Rank	Comments
	219,677	2		55

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

Schematic

Parts

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

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

Some countries or states require you to notify anyone you are talking to that 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 connect anything to their lines.

Related Circuits

Comments

Add A Comment

anonymous Telephone Recorder Wednesday, November 23, 2022 3:24:01 AM

I agree with the previous comment. An isolation transformer in the recorder Mic output is necessary. Also, a small bridge rectifier placed in the telephone input serves to iron out any reverse polarity issues. With those two modifications, this circuit works very well and is far simpler than most. Substitute freely--the switch mechanism is not that fussy. Thanks.

anonymous Telephone Recorder Saturday, April 27, 2013 11:57:01 PM

If you connect any expensive recording device to a telephone line without complete DC isolaation you risk burning out componnets on the device, not really woth wrecking a PC or its soundchip just to save on a cheap audio isolation transformer. Nowadays PSTN lines are often fitted with incorrect polarity too... without isolation you will lilkely get a nasty hum if you are fortunate or silence of a fried motherboard if you are not so fortunate.

osmus Telephone Recorder Monday, March 21, 2011 7:11:15 PM

wihout a line isolation with transformer its a bad idea to plug your mic to phone.

Harry Telephone Recorder Friday, April 02, 2010 9:52:42 AM

Can somebody mail me the circuit details. I need this to record my meeting and will help me plan my communication/actions better. Currently I use the speaker phone and have problem with noise when I speak into it.

anonymous Telephone Recorder Thursday, September 24, 2009 10:13:23 AM

This Telephone Recorder is fucking rad!

anonymous Telephone Recorder Friday, October 31, 2008 12:39:15 AM

its a nice circuit idea. Simple one. Nothing new though.

Rao Waseem Telephone Recorder Thursday, May 08, 2008 3:40:12 AM

this is very useful project.i liked it very much if u can any comments u can mail me.

sagar Telephone Recorder Thursday, February 28, 2008 3:57:06 AM

if u dont mind pls mail me the complete info,block diagram,circuit diagram&major advantages ,applications of this project which helps me in doing my mini project

navaneeth Telephone Recorder Tuesday, February 19, 2008 6:40:26 AM

would youmind pls mail me the complete info,block diagram,circuit diagram&major advantages ,applications of this project which helps me in doing my mini project. what is remote control jack stands here for?

antany Telephone Recorder Tuesday, January 22, 2008 12:13:53 PM

where should we connect the inputs (on which phone line)

hulu beliku Telephone Recorder Wednesday, January 16, 2008 6:08:39 AM

would youmind pls mail me the complete info,block diagram,circuit diagram&major advantages ,applications of this project which helps me in doing my mini project

sushanth Telephone Recorder Thursday, January 10, 2008 9:25:54 PM

please tell me the circuit analysis and about remote control jack

hossam about the Telephone Recorder circuit Tuesday, December 04, 2007 1:08:57 PM

i just need more information about this circuit because i have to design it ,,and i need to know what each part of this circuit do ? wait 4 ur reply ,,and i hoep it come soon

pallavi Telephone Conversation Recorder Wednesday, November 28, 2007 4:35:52 AM

if u dont mind pls mail me the complete info,block diagram,circuit diagram&major advantages ,applications of this project which helps me in doing my mini project

hashim mahmoud Telephone Recorder Wednesday, November 21, 2007 3:07:16 PM

hi can u help me to do this project.by sending it's complete info. & circuit analysis & its major advantages to my mail id. thanks.

Rajkumar Telephone Recorder Thursday, November 01, 2007 4:06:51 AM

Hi, Iam rajkumar from chennai, India.I am ruing a concern in chennai.so I feel like some problem was going on with our workers pl. send the details of thie phone recorder to record the conversation between the workers nd the clients

psalmmuel s ashaolu Telephone Recorder Tuesday, October 16, 2007 1:22:15 PM

can you please sent me details on this cct

psalmmuel s ashaolu Telephone Recorder Tuesday, October 16, 2007 1:20:33 PM

the schematic cct is quite great, i will love to try it on my own. i give kudos to the designer.

ovidiu Telephone Recorder Wednesday, October 10, 2007 4:51:03 PM

The control jack is for start/stop the recorder equiped with REM (remote) jack

usman khalid ELECTRONICS PICS Friday, September 21, 2007 3:49:22 PM

sir, this website absolutely first class but if u give us the original pics of circuit components with schematic as well then it is better this site become unique site then the others. also, it help 4 them who r new in this field. thanx

rohit garg telephone conversation recorder Thursday, September 20, 2007 11:37:07 PM

i want to get a help about this project ,i want to get the full description with their circuit diagram and their theory

JOEL QUESTION Friday, September 14, 2007 2:25:50 PM

HI, I NEED HELP WITH A PROJECTE, DOU U HAVE A CIRCUIT OF DETECTION OFF HOOK TELEPHONE BUT OF CENTRAL

gurdeep; Telephone Recorder Wednesday, September 05, 2007 11:45:06 AM

will u help me to do this project.by sending it's complete info. & circuit analysis & its major advantages to my mail id. thanks.

divya.k Telephone conversation Recorder Friday, August 31, 2007 5:47:08 AM

if u dont mind pls mail me the perfect circiut and details of this project which helps me in doing my mini project.

ASIFA INAMDAR Telephone Recorder Tuesday, August 28, 2007 1:05:05 AM

Pls give me the more information about this circuits & about cost also thanks.waiting for your reply

seth sarpong adjei Telephone Recorder Tuesday, August 21, 2007 12:41:40 PM

Please i want you to send me the detail information about this project, to enable me perforem it. Thanks you.

suraj Telephone Recorder Wednesday, August 08, 2007 10:51:29 PM

i want to do this project.so i need the necessary information about this project.can u please mail me the necessary details about this project.will this circuit really works? Thans you... Suraj.

gokhan cag Telephone Recorder Tuesday, August 07, 2007 1:47:07 PM

what is the function of control jack? nobody has explained it clearly...

Debra Howard Telephone Recorder Friday, August 03, 2007 9:05:56 PM

I purchased an inexpensive recorder and a little gadget that you hooked to it to plug into the wall. I was using this on someone that I suspected stilling medication. However, I have a lawsuit going on because I was hurt very badly and the only way I could get this man out of my house was to move out and have the utilities cut off. So this is what I did, however, because he is bipolar and on "no medication" he resented what I had done however he hadn't worked to contribute any money into the house hold in two years. Anyway, he always seemed to have money without working and I was always very short on medication. So I went to a safe shop and purchased a used drop money box and then about two months later I moved out with my mother in order to get rid of this man. While he was leaving, he made the comment to me "you just wait until they put me on the stand". This man lies about "everything". If you say white, he says black. Anyway, after I had the utilities cut off and he finally moved out, he found my little recorder and the line gadget that hooked up to it in order to record my phone. My question is, Is there any way I can tell when I answer this phone or call this number if he is using this on me now? He is now living with someone else with cell phones and house phones. Are there any sounds I can listen for or anything I can key into the phone to see if it's being taped? Please help if you can. My mediation is next week and I'm sure if they have his recordings, he will turn them in to something there not. Can you please please help?????

Jim Telephone Recorder Monday, July 30, 2007 1:01:58 PM

To make this a REALLY useful circuit, you should place a DTMF decoder in-line with the audio so the circuit can listen for a keypad key press and shut the recorder off. There are no affordable telephone recorders out there with this capability, i.e. recorder comes on when phone is picked up (like now), but if listener doesn't want to contuinue recording, they can press a key on phone keypad and shut recorder off. Awesome feature.

Gast�n Telephone Recorder Saturday, July 21, 2007 1:23:57 PM

Hi, can i inject audio in the phone line by using this circuit??

ramesh Telephone Recorder Monday, July 16, 2007 5:50:34 AM

please sent me brief description of each components and the projects

pushpendra Telephone Recorder Sunday, July 15, 2007 3:49:38 AM

will u help me to do this project.by sending it's complete info. & circuit analysis & its major advantages to my mail id. thanks.

Neeraj Telephone Recorder Thursday, July 12, 2007 4:53:37 AM

Can u plzz specify da device 2 wich da MIC JACK gets connected?

rekha Telephone Recorder Sunday, July 01, 2007 9:00:01 AM

i want to do this project.so i need the necessary information about this project.can u please mail me the necessary details about this project.will this circuit really works?

raza Telephone Recorder Thursday, June 07, 2007 1:45:50 PM

has anyone tried this circuit?? can u plz tell me if it works or not!!

anonymous Telephone Recorder Thursday, May 24, 2007 2:13:47 PM

control jack????
(Editor's notes: Read previous comments.)

Sebastiaan Telephone Recorder Thursday, May 24, 2007 2:05:58 PM

The remote control jack is nothing more than an electronic switch (like a relay) which you will have to put between one of the power supply wires of your recorder (battery or adapter). Than as soon as the hook is lifted this "remote output" will allow power to your recorder and the recorder starts running. If you have placed your recorder in the recorder setup, this will mean it will start recording emideatly as soon as the hook has been lifted. The audio section however is not that advanced and it would be safer for your recorder (and improved quality) to use an old audio transformer from an old telephone (see link http://www.engadget.com/2005/09/27/how-to-build-a-telephone-recording-circuit-from-an-old-modem/) Have fun building

anonymous Telephone Recorder Wednesday, May 23, 2007 6:04:47 AM

please i want proper explanation for designing this phantagloriuos project.tthe information can be texted to the e-mail adress

Zuberi Telephone Recorder Wednesday, May 16, 2007 3:44:50 PM

hi ...ma question ...if we put the lines of microphone in computer,s mic port or line in port.......then is it possible to record the call by any recording software .......ass the same funcation occur in mic recoriding in computer ....and also tell me the funcation of remote control jack ...........is this line are for sum supply ?? or there is sum other function on it ..........waiting for ur reply ...........

xia Telephone Recorder Monday, May 14, 2007 5:24:20 PM

good

xia Telephone Recorder Monday, May 14, 2007 5:22:24 PM

not very bad

Franklin L Telephone Recorder Friday, May 11, 2007 2:06:14 PM

The remote control jack is located in the a Controlled Tape Recorder device. usually in most of Tape recorder http://www.radioshack.com/search/index.jsp?kwCatId=&kw=telephone%20recorder&origkw=telephone%20recorder&sr=1

anonymous Telephone Recorder Thursday, May 10, 2007 5:31:33 AM

THANKS TO PUBLISH THIS TYPE OF CIRCUITS,KINDLY GUIDE ME HOW I CAN CONVERT MECHANICAL CAM OR GEAR MOVEMENT IN TO DIGITAL AND RECORD IN PC LIKE HUNDRED PLACED DATA TO BE GATHERED BY DATA LOGGER AT ONE PLACED ON PHYSICAL LINE. THANKING YOU YOURS FAITH FULLY M.Y.GANU.

hamad Telephone Recorder Tuesday, May 08, 2007 12:12:59 PM

what is remote control jack..???? and its constructional idea. is there effect on line?

umair Telephone Recorder Saturday, April 28, 2007 9:16:54 AM

control jack?????plz explain its constructrion and working in detail......

bety Telephone Recorder Tuesday, April 24, 2007 12:06:19 PM

very good

anonymous Telephone Recorder Friday, April 13, 2007 3:58:48 AM

remote control jack???????????????????

anonymous Telephone Recorder Wednesday, April 04, 2007 12:31:36 PM

its quite a perfect idea but it shall have some amelioration

anonymous Telephone Recorder Sunday, April 01, 2007 4:17:20 AM

what is remote control jack..???? and its constructional idea.

vinay Telephone Recorder Friday, March 23, 2007 10:26:12 AM

give some deatils about circuitry and working of it .. please

mazhar Telephone Recorder Monday, March 12, 2007 1:24:05 AM

working principle of telephone recorder

mazhar Telephone Recorder Monday, March 12, 2007 1:22:37 AM

function of telepjone recorder

romany Telephone Recorder Monday, March 05, 2007 2:30:20 PM

is there effect on line?

vaibhav Telephone Recorder Monday, March 05, 2007 6:29:37 AM

This circuit can prove to be of quiet a help in some cases... To me it seems a perfect minor project.

All comments are being shown. Show Only Last 10 Comments. Add A Comment

If you would like to leave a comment, you can do so using the form below. Comments can be things like suggestions, successes or failures, improvements, similar circuits, error reports, an answer to a previous commenter's question, or anything in between. However if you would like to ask a question it is suggested that you use the forum instead. The forum provides a more robust environment for discussion.

Important: If you post a technical question here, there is no guarantee it will be answered. All technical questions should be posted to the forum. The owner of this site generally does not answer questions in comments.

All comments are subject to approval before they are displayed here, so your comment will not appear immediately. This is done mainly to prevent spam and other abuse. If you wish to remain anonymous, simply enter "anonymous" for your name and/or email.

Name:
Email:
Subject:
Comments:
Anti Spam Code:	Please enter the exact text shown in the image above into the box below. Browser cookies must be enabled to comment on circuits.

Privacy Policy

anonymous	Telephone Recorder	Wednesday, November 23, 2022 3:24:01 AM
I agree with the previous comment. An isolation transformer in the recorder Mic output is necessary. Also, a small bridge rectifier placed in the telephone input serves to iron out any reverse polarity issues. With those two modifications, this circuit works very well and is far simpler than most. Substitute freely--the switch mechanism is not that fussy. Thanks.
anonymous	Telephone Recorder	Saturday, April 27, 2013 11:57:01 PM
If you connect any expensive recording device to a telephone line without complete DC isolaation you risk burning out componnets on the device, not really woth wrecking a PC or its soundchip just to save on a cheap audio isolation transformer. Nowadays PSTN lines are often fitted with incorrect polarity too... without isolation you will lilkely get a nasty hum if you are fortunate or silence of a fried motherboard if you are not so fortunate.
osmus	Telephone Recorder	Monday, March 21, 2011 7:11:15 PM
wihout a line isolation with transformer its a bad idea to plug your mic to phone.
Harry	Telephone Recorder	Friday, April 02, 2010 9:52:42 AM
Can somebody mail me the circuit details. I need this to record my meeting and will help me plan my communication/actions better. Currently I use the speaker phone and have problem with noise when I speak into it.
anonymous	Telephone Recorder	Thursday, September 24, 2009 10:13:23 AM
This Telephone Recorder is fucking rad!
anonymous	Telephone Recorder	Friday, October 31, 2008 12:39:15 AM
its a nice circuit idea. Simple one. Nothing new though.
Rao Waseem	Telephone Recorder	Thursday, May 08, 2008 3:40:12 AM
this is very useful project.i liked it very much if u can any comments u can mail me.
sagar	Telephone Recorder	Thursday, February 28, 2008 3:57:06 AM
if u dont mind pls mail me the complete info,block diagram,circuit diagram&major advantages ,applications of this project which helps me in doing my mini project
navaneeth	Telephone Recorder	Tuesday, February 19, 2008 6:40:26 AM
would youmind pls mail me the complete info,block diagram,circuit diagram&major advantages ,applications of this project which helps me in doing my mini project. what is remote control jack stands here for?
antany	Telephone Recorder	Tuesday, January 22, 2008 12:13:53 PM
where should we connect the inputs (on which phone line)
hulu beliku	Telephone Recorder	Wednesday, January 16, 2008 6:08:39 AM
would youmind pls mail me the complete info,block diagram,circuit diagram&major advantages ,applications of this project which helps me in doing my mini project
sushanth	Telephone Recorder	Thursday, January 10, 2008 9:25:54 PM
please tell me the circuit analysis and about remote control jack
hossam	about the Telephone Recorder circuit	Tuesday, December 04, 2007 1:08:57 PM
i just need more information about this circuit because i have to design it ,,and i need to know what each part of this circuit do ? wait 4 ur reply ,,and i hoep it come soon
pallavi	Telephone Conversation Recorder	Wednesday, November 28, 2007 4:35:52 AM
if u dont mind pls mail me the complete info,block diagram,circuit diagram&major advantages ,applications of this project which helps me in doing my mini project
hashim mahmoud	Telephone Recorder	Wednesday, November 21, 2007 3:07:16 PM
hi can u help me to do this project.by sending it's complete info. & circuit analysis & its major advantages to my mail id. thanks.
Rajkumar	Telephone Recorder	Thursday, November 01, 2007 4:06:51 AM
Hi, Iam rajkumar from chennai, India.I am ruing a concern in chennai.so I feel like some problem was going on with our workers pl. send the details of thie phone recorder to record the conversation between the workers nd the clients
psalmmuel s ashaolu	Telephone Recorder	Tuesday, October 16, 2007 1:22:15 PM
can you please sent me details on this cct
psalmmuel s ashaolu	Telephone Recorder	Tuesday, October 16, 2007 1:20:33 PM
the schematic cct is quite great, i will love to try it on my own. i give kudos to the designer.
ovidiu	Telephone Recorder	Wednesday, October 10, 2007 4:51:03 PM
The control jack is for start/stop the recorder equiped with REM (remote) jack
usman khalid	ELECTRONICS PICS	Friday, September 21, 2007 3:49:22 PM
sir, this website absolutely first class but if u give us the original pics of circuit components with schematic as well then it is better this site become unique site then the others. also, it help 4 them who r new in this field. thanx
rohit garg	telephone conversation recorder	Thursday, September 20, 2007 11:37:07 PM
i want to get a help about this project ,i want to get the full description with their circuit diagram and their theory
JOEL	QUESTION	Friday, September 14, 2007 2:25:50 PM
HI, I NEED HELP WITH A PROJECTE, DOU U HAVE A CIRCUIT OF DETECTION OFF HOOK TELEPHONE BUT OF CENTRAL
gurdeep;	Telephone Recorder	Wednesday, September 05, 2007 11:45:06 AM
will u help me to do this project.by sending it's complete info. & circuit analysis & its major advantages to my mail id. thanks.
divya.k	Telephone conversation Recorder	Friday, August 31, 2007 5:47:08 AM
if u dont mind pls mail me the perfect circiut and details of this project which helps me in doing my mini project.
ASIFA INAMDAR	Telephone Recorder	Tuesday, August 28, 2007 1:05:05 AM
Pls give me the more information about this circuits & about cost also thanks.waiting for your reply
seth sarpong adjei	Telephone Recorder	Tuesday, August 21, 2007 12:41:40 PM
Please i want you to send me the detail information about this project, to enable me perforem it. Thanks you.
suraj	Telephone Recorder	Wednesday, August 08, 2007 10:51:29 PM
i want to do this project.so i need the necessary information about this project.can u please mail me the necessary details about this project.will this circuit really works? Thans you... Suraj.
gokhan cag	Telephone Recorder	Tuesday, August 07, 2007 1:47:07 PM
what is the function of control jack? nobody has explained it clearly...
Debra Howard	Telephone Recorder	Friday, August 03, 2007 9:05:56 PM
I purchased an inexpensive recorder and a little gadget that you hooked to it to plug into the wall. I was using this on someone that I suspected stilling medication. However, I have a lawsuit going on because I was hurt very badly and the only way I could get this man out of my house was to move out and have the utilities cut off. So this is what I did, however, because he is bipolar and on "no medication" he resented what I had done however he hadn't worked to contribute any money into the house hold in two years. Anyway, he always seemed to have money without working and I was always very short on medication. So I went to a safe shop and purchased a used drop money box and then about two months later I moved out with my mother in order to get rid of this man. While he was leaving, he made the comment to me "you just wait until they put me on the stand". This man lies about "everything". If you say white, he says black. Anyway, after I had the utilities cut off and he finally moved out, he found my little recorder and the line gadget that hooked up to it in order to record my phone. My question is, Is there any way I can tell when I answer this phone or call this number if he is using this on me now? He is now living with someone else with cell phones and house phones. Are there any sounds I can listen for or anything I can key into the phone to see if it's being taped? Please help if you can. My mediation is next week and I'm sure if they have his recordings, he will turn them in to something there not. Can you please please help?????
Jim	Telephone Recorder	Monday, July 30, 2007 1:01:58 PM
To make this a REALLY useful circuit, you should place a DTMF decoder in-line with the audio so the circuit can listen for a keypad key press and shut the recorder off. There are no affordable telephone recorders out there with this capability, i.e. recorder comes on when phone is picked up (like now), but if listener doesn't want to contuinue recording, they can press a key on phone keypad and shut recorder off. Awesome feature.
Gast�n	Telephone Recorder	Saturday, July 21, 2007 1:23:57 PM
Hi, can i inject audio in the phone line by using this circuit??
ramesh	Telephone Recorder	Monday, July 16, 2007 5:50:34 AM
please sent me brief description of each components and the projects
pushpendra	Telephone Recorder	Sunday, July 15, 2007 3:49:38 AM
will u help me to do this project.by sending it's complete info. & circuit analysis & its major advantages to my mail id. thanks.
Neeraj	Telephone Recorder	Thursday, July 12, 2007 4:53:37 AM
Can u plzz specify da device 2 wich da MIC JACK gets connected?
rekha	Telephone Recorder	Sunday, July 01, 2007 9:00:01 AM
i want to do this project.so i need the necessary information about this project.can u please mail me the necessary details about this project.will this circuit really works?
raza	Telephone Recorder	Thursday, June 07, 2007 1:45:50 PM
has anyone tried this circuit?? can u plz tell me if it works or not!!
anonymous	Telephone Recorder	Thursday, May 24, 2007 2:13:47 PM
control jack???? (Editor's notes: Read previous comments.)
Sebastiaan	Telephone Recorder	Thursday, May 24, 2007 2:05:58 PM
The remote control jack is nothing more than an electronic switch (like a relay) which you will have to put between one of the power supply wires of your recorder (battery or adapter). Than as soon as the hook is lifted this "remote output" will allow power to your recorder and the recorder starts running. If you have placed your recorder in the recorder setup, this will mean it will start recording emideatly as soon as the hook has been lifted. The audio section however is not that advanced and it would be safer for your recorder (and improved quality) to use an old audio transformer from an old telephone (see link http://www.engadget.com/2005/09/27/how-to-build-a-telephone-recording-circuit-from-an-old-modem/) Have fun building
anonymous	Telephone Recorder	Wednesday, May 23, 2007 6:04:47 AM
please i want proper explanation for designing this phantagloriuos project.tthe information can be texted to the e-mail adress
Zuberi	Telephone Recorder	Wednesday, May 16, 2007 3:44:50 PM
hi ...ma question ...if we put the lines of microphone in computer,s mic port or line in port.......then is it possible to record the call by any recording software .......ass the same funcation occur in mic recoriding in computer ....and also tell me the funcation of remote control jack ...........is this line are for sum supply ?? or there is sum other function on it ..........waiting for ur reply ...........
xia	Telephone Recorder	Monday, May 14, 2007 5:24:20 PM
good
xia	Telephone Recorder	Monday, May 14, 2007 5:22:24 PM
not very bad
Franklin L	Telephone Recorder	Friday, May 11, 2007 2:06:14 PM
The remote control jack is located in the a Controlled Tape Recorder device. usually in most of Tape recorder http://www.radioshack.com/search/index.jsp?kwCatId=&kw=telephone%20recorder&origkw=telephone%20recorder&sr=1
anonymous	Telephone Recorder	Thursday, May 10, 2007 5:31:33 AM
THANKS TO PUBLISH THIS TYPE OF CIRCUITS,KINDLY GUIDE ME HOW I CAN CONVERT MECHANICAL CAM OR GEAR MOVEMENT IN TO DIGITAL AND RECORD IN PC LIKE HUNDRED PLACED DATA TO BE GATHERED BY DATA LOGGER AT ONE PLACED ON PHYSICAL LINE. THANKING YOU YOURS FAITH FULLY M.Y.GANU.
hamad	Telephone Recorder	Tuesday, May 08, 2007 12:12:59 PM
what is remote control jack..???? and its constructional idea. is there effect on line?
umair	Telephone Recorder	Saturday, April 28, 2007 9:16:54 AM
control jack?????plz explain its constructrion and working in detail......
bety	Telephone Recorder	Tuesday, April 24, 2007 12:06:19 PM
very good
anonymous	Telephone Recorder	Friday, April 13, 2007 3:58:48 AM
remote control jack???????????????????
anonymous	Telephone Recorder	Wednesday, April 04, 2007 12:31:36 PM
its quite a perfect idea but it shall have some amelioration
anonymous	Telephone Recorder	Sunday, April 01, 2007 4:17:20 AM
what is remote control jack..???? and its constructional idea.
vinay	Telephone Recorder	Friday, March 23, 2007 10:26:12 AM
give some deatils about circuitry and working of it .. please
mazhar	Telephone Recorder	Monday, March 12, 2007 1:24:05 AM
working principle of telephone recorder
mazhar	Telephone Recorder	Monday, March 12, 2007 1:22:37 AM
function of telepjone recorder
romany	Telephone Recorder	Monday, March 05, 2007 2:30:20 PM
is there effect on line?
vaibhav	Telephone Recorder	Monday, March 05, 2007 6:29:37 AM
This circuit can prove to be of quiet a help in some cases... To me it seems a perfect minor project.