Hello, 
Personally, I used a solid state relay like this (MP240D4)
http://www.opto22.com/site/pr_details.aspx?item=MP240D4&qs=100610121053,,,5,8&;

The minimum signal voltage is 3 volts (SB3 3.3 volts) 
He has an internal resistance of 1000 ohms therefore nothing to add 
And it works perfectly, no noise

Charlie


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