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Circuit operation is as follows. When the phone is on hook the voltage across the phone line is about 48volts dc. When the phone is off hook the voltage will drop to below 10volts dc. When the line voltage is at 48volts the FET is off which causes Q2 and Q3 to be off. When the phone is picked up the FET turns on along with Q2 and Q3 which turns your recorder on. The tape recorder must be in the record mode at all times. As you can see the power source for the circuit is the phone line.

  

Sir, this project is very interesting, would you send to me the details please.

 

  

hi can you pls send the projects details like circuit diagram, synopsis, tools used and any other regarding this project to " santu_2190@yahoo.co.in "  as soon as possible  as i'm very mnch interested to do this for my final year project and need to submit  details to college very shortly

  

hey

pla snd me th ckt diagram @ the related details......

 

  

abeedshah@yahoo.com

plz snd me ckt diagram and all the related details

 

  

I wou;d like to try this for my final capstone project. Is it possible i can get all the information and details for this project?????