basic experiments

Posted: 11/5/2018 3:17:47 PM
MIEcomes

From: Tomsk

Joined: 11/5/2018

JPascal, 
Can you share a volume control scheme? I am interested in your technical implementation of this part of theremin. You may not share, this is your decision and I will understand it.

Respectfully, MIE

Posted: 11/7/2018 9:05:49 PM
JPascal

From: Berlin Germany

Joined: 4/27/2016

Hi MIE,
the circuit on the breadboard i have built for the "roboter" video is still a trial stage. But I can draw the schematic and share it here. Give me some days.
JPascal

Posted: 11/7/2018 9:51:31 PM
oldtemecula

From: 60 Miles North of San Diego, CA

Joined: 10/1/2014


Hello JPascal and MIE,

The volume control does work excellent from what I observe so count me in, with strong interest, wanting to view your clever design.

I have not done any soldering in the past few years but picked up the iron again this week, almost an addiction, I keep telling myself don’t breathe the smoke. When I was a child solder rosin smelled good... like pine sap.  I am trying to get some of my theremin claims working for a date in Saint Petersburg, Russia very soon. Her classical voice can be elusive but I am teasing her just enough, it will be our last dance. Will be setting up to do a thermal drift test overnight.

JPascal it will be nice to see some old school electronics that I just might understand and it works. 

Christopher

Posted: 11/8/2018 6:46:47 AM
MIEcomes

From: Tomsk

Joined: 11/5/2018

JPascal,
Thank you very much. Looking forward to your drawings. I liked the rather sensitive response of the volume antenna.

MIE

Posted: 11/14/2018 8:28:17 PM
JPascal

From: Berlin Germany

Joined: 4/27/2016

Here is the principle circuit, values will be added later. For the genuine narrow bandwidth high resonance level filter I have applied a patent.

http://www.thereminworld.com/files/photos/16058/theremin_volume_control_jp.jpg

Posted: 11/14/2018 9:16:45 PM
oldtemecula

From: 60 Miles North of San Diego, CA

Joined: 10/1/2014


JPascal,

This is really good stuff. I have not worked with them but I think those are NMOS fets? If the parts are readily available I would like to build your circuit and in the process make a PDF with your name on it so it will be etched into the board and others can enjoy your work.

Thank you for your theremin research.

Right now I exploring the Pitch side circuit of my own design. She gave me hell yesterday and today nothing but affection. There is a specific waveform I am after and only then I know she respects my efforts, or is it him?

Christopher

Posted: 11/15/2018 6:46:21 AM
MIEcomes

From: Tomsk

Joined: 11/5/2018

Hello, JPascal!
I tried to pick up the values of the elements on your circuit. Can you tell if something is wrong? Also, I had a number of questions:
1)L21 and L22 is one coil with a tap in the middle or two different coils?
2)Is it permissible to use 2N5484 and 1N4148 in this inclusion?

MIE


D11 is wrong, it must be varactor

Posted: 11/16/2018 6:47:08 AM
JPascal

From: Berlin Germany

Joined: 4/27/2016

Wow, MIE, you are hired! Answer comes soon. Can you post this as LT Spice file? Instead of the varactor diode a variable capacitor could be used.

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