Now some results of the volume control. Here please find a short mp3.
From: Theremin Motherland
"The practical results are good." - JPascal
Interesting. What about the repeatability? (the FETs have a noticeable spread of parameters).
The jFETs I use have about 150 to 200 Ohm respective to a gain-source-voltage = 0. Below - 1,5 V they are high resistance, more than 1 MegOhm. The knob for adjustment the volume control would easy compensate parameter tolerance of the Fets.
Спасибо за интерес.