|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.
|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.
|Monday, March 21, 2011 7:11:15 PM
|wihout a line isolation with transformer its a bad idea to plug your mic to phone.
|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.
|Thursday, September 24, 2009 10:13:23 AM
|This Telephone Recorder is fucking rad!
|Friday, October 31, 2008 12:39:15 AM
|its a nice circuit idea. Simple one.
Nothing new though.
| Rao Waseem
|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.
|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
|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?
|Tuesday, January 22, 2008 12:13:53 PM
|where should we connect the inputs (on which phone line)