Continue to Site

Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Require a simple telephone line simulator!

Status
Not open for further replies.

UroBoros

Advanced Member level 2
Advanced Member level 2
Joined
May 5, 2004
Messages
642
Helped
19
Reputation
38
Reaction score
8
Trophy points
1,298
Location
Cochin - India
Activity points
6,463
Hai

For developing a DTMF trigger through phone lines,I am looking for a simple telephone line simulator.

requirements.


1 . line voltages 48V ON hook and 10-12V OFF hook.
2. ringing signal to be generated at will .

3. Dial Tone ,optional not must

Links or suggessions or circuits. please.

Thanks a lot ..
Looking forward for replies


picstudent
 

Try this one ..
It is not as simple as it sounds ..

Regards,
IanP
 

    UroBoros

    Points: 2
    Helpful Answer Positive Rating
Hai

Thanks IanP for the circuit,But I am afraid it is too complex for my time available for this purpose. Let me ask you one thing.


if I created a 60volts dc power supply and connect the phone through a series dropping resistor(Value by trial and error),I can simulate the dc voltage changes when the phone is picked up. (45volts to 12volts)

Then next problem is how to generate theringing signal and enforce the same into telephone line.

No other feature is required.

My MCU unit needs to see the line status .ON hook or OFF hook(By a comparator). Also it have to count the rings . So voltsge and rings are only needed.

thanks
picstudent
 

I thought so ..
Here you will find much easier "telephone ringer":
(Methods for generating good ring voltage)
**broken link removed**

Regards,
IanP
 

    UroBoros

    Points: 2
    Helpful Answer Positive Rating

    akakak4

    Points: 2
    Helpful Answer Positive Rating
Status
Not open for further replies.

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top