ring generator circuit

[Laplace]

ring generator circuit schematic is required. any help?

Thanks,
Laplace

 

[penrico]

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.

 

[TimothyBoot]

telephone ring generator circuit

u can use 4n25 optocoupler

https://picbasic.com/downloads/LABXTSCH.PDF

 

[Laplace]

Thanks for your kind help.

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

Thanks...

 

[dacadc]

Please see the supertex products, they are suggesting ring generator ICs.

 

[papyaki]

Hi

Have a look at that :

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

Schematic is available.

 

[bobcat1]

Here is a very simple ringer using 2 transformer & cap


best

bobi

 

[sokrat]

In the folowing link some good circuits and information for telephone

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

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

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THANKS


S 8O KRAT