okay, i built the above circuit and WOW!, that's looks good. My scope can't even measure the signal when the JFET is off at lower frequencies (300 Hz). I do notice that at higher frequencies (5k) you start to see a small signal.
So I have two questions... as my scope measures it at the Source... the 3 Vpp AC signal is between 6.3v and 3.3v. But isn't it receiving a 8 volt bias voltage? Wouldn't one expect to see the AC signal higher?
My other question is I measure 4 volts at the gate when the switch is closed. But with a low of 3.3v at the source (assuming my measurement is correct) at the low point of the AC signal, would the JFET not be no longer reverse biased? Unfortunately Falstad doesn't help me too much here, the voltages model differently in that application.
Thanks again for your help...