20Hz 90V Ring Generator

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gyroscope

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Hi everyone,

I need 20 hz and 90V ring generator for my old phone. It can be schematic design or a sale product.
Could you please hep me about this situation?

Thanks
 

You won't need 90 Volt, I expect that 30 Volt would be enough.

The exchange ring supply is specified as 90 Volt, but the voltage that reaches phone would be less due to series resistance and the bell impedance.

I have also heard a phone bell ring on 50 Hz.
 

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