Promblem controlling an 1-10V dimming ballast

Hello everyone,

i am new with the arduino and am using it at my project which is controlling an 1-10v dimmable ballast.
First i made a circuit using an omp amp to multiple the arduino PWM output.This circuit normally works but when i connect it to the ballast the lamps are not dimmed.
I measured the 1-10v input of the ballast when its only powered with 220V ac and it gives me 13V
When i connect it to the arduino and altering its out put voltage this voltage is only changing a little.
What might be wrong ?Could anyone help me?

sorry if my English are bad

I don't think they use normal PWM, instead you need to use manchester code. Search for arduino manchester code library. I'm sure there's some documentation available.

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