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ring generator circuit
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Laplace



Joined: 26 Feb 2002
Posts: 122
Post10 Sep 2003 15:56   

ring generator circuit
ring generator circuit schematic is required. any help?

Thanks,
Laplace
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Post10 Sep 2003 15:56   

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penrico



Joined: 28 Aug 2001
Posts: 271
Helped: 15
Location: Argentina
Post10 Sep 2003 16:04   

ring generator schematic
Telephonic Rings is generated by a signal of 50-80 VRms, 25 to 50Hz.

Easy way to do it, is using a AC transformer from line power to your circuit, just let a secundary of your power source with 70 Vrms AC 50Hz.

Ring circuit in most telephones is a .47uF capacitor in series with 4K7 resistor. So, current you need is less than 2mA.
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TimothyBoot



Joined: 08 Sep 2003
Posts: 2
Post10 Sep 2003 16:16   

telephone ring generator circuit
u can use 4n25 optocoupler

http://picbasic.com/downloads/LABXTSCH.PDF
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Laplace



Joined: 26 Feb 2002
Posts: 122
Post12 Sep 2003 10:10   

Re: ring generator circuit
Thanks for your kind help.

At the same time, I am working on generating -48V DC from ~220V AC. Any schematics or suggestions?

Thanks...
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dacadc



Joined: 22 Apr 2001
Posts: 245
Location: Ukraine
Post13 Sep 2003 6:49   

Re: ring generator circuit
Please see the supertex products, they are suggesting ring generator ICs.
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papyaki



Joined: 13 Apr 2002
Posts: 564
Helped: 19
Location: A small village somewhere in Gaul
Post13 Sep 2003 9:07   

Re: ring generator circuit
Hi

Have a look at that :

h**p://w*w.hotspot.freeserve.co.uk/HOTSPOT/TLS/tlsframe.htm

Schematic is available.
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bobcat1



Joined: 10 Jul 2002
Posts: 1182
Helped: 51
Post17 Sep 2003 13:42   

Re: ring generator circuit
Here is a very simple ringer using 2 transformer & cap


best

bobi Smile

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sokrat



Joined: 23 Sep 2002
Posts: 371
Helped: 2
Location: EGYPT
Post18 Sep 2003 8:21   

Re: ring generator circuit
In the folowing link some good circuits and information for telephone

http://www.electronic-circuits-diagrams.com/telephones_circuits.shtml

http://www.optics2001.com/electronics/Circuits/Telephone.htm

http://www.phrack.org/search/index.php?author=&andor=or&title=telephone&comment=&submit=submit

http://www.howstuffworks.com/telephone.htm

http://www.psychicspy.com/telephon.html


THANKS


S Shocked KRAT
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