basic experiments

Posted: 11/22/2016 10:53:57 PM
JPascal

From: Berlin Germany

Joined: 4/27/2016

Now some results of the volume control. Here please find a short mp3.

JPascal Theremin volume control test

 Volume Control JPascal Theremin

 

Posted: 11/27/2016 5:49:40 PM
ILYA

From: Theremin Motherland

Joined: 11/13/2005

"The practical results are good." - JPascal

Interesting. What about the repeatability? (the FETs have a noticeable spread of parameters).

Posted: 11/30/2016 6:40:45 PM
JPascal

From: Berlin Germany

Joined: 4/27/2016

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. 

Resistance JFet BF245a

Спасибо за интерес.

Posted: 4/2/2017 5:43:52 PM
JPascal

From: Berlin Germany

Joined: 4/27/2016

Now I have posted a little 2 minutes video, shows an unusual replacement of antennas...

https://youtu.be/ZZYaoMSDtao

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