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ring generator circuit

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Laplace

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ring generator circuit schematic is required. any help?

Thanks,
Laplace
 

penrico

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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.
 

Laplace

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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

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

papyaki

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Hi

Have a look at that :

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

Schematic is available.
 

bobcat1

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Here is a very simple ringer using 2 transformer & cap


best

bobi :)
 

sokrat

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