Let's Design and Build a (simple) Analog Theremin!

Posted: 6/25/2022 1:13:54 PM
RSchwim

From: Brooklyn

Joined: 8/15/2009

D-LEV in concert

Posted: 6/26/2022 6:50:47 AM
JPascal

From: Berlin Germany

Joined: 4/27/2016

Very nice recording! The vowel A timbre is interesting. There is a switch in my brain, cannot feel if this timbre is good or not here. 
 (false thread?) 

Posted: 7/29/2022 2:41:56 PM
Martel

From: Russia

Joined: 9/8/2016

I would like to recall one of the simple ideas of timbre formation in simple theremin schemes. I tried different circuits of theremin generators, and simple mixers on ordinary common-use transistors are suitable for any of them. For example BC547 and the like.
If the generators are on field-effect transistors, then such a mixer works, it seems to me, no worse than on field-effect transistors. But it also has the potential for tone control. Therefore, I decided to remind the designers of this idea.
  Since in the theremin a big task is to create a rich, rich, beautiful sound. And any ideas of shaping the timbre are important.

Posted: 8/23/2022 5:09:38 PM
dewster

From: Northern NJ, USA

Joined: 2/17/2012

Buffered Oscillator

Another oscillator that simulates well, haven't benched it (yet):

Uses my standard buffer for drive and sensing via the power rails, and something like a single CMOS inverter for some gain.  I like this approach because it somewhat isolates the CMOS I/O from the coil.  The bipolar supply simplifies the inverter model, and wouldn't exist in the real circuit.

LTSpice file here: https://www.mediafire.com/file/d26llr2gyaicfgr/buffered_osc_2022-08-22.asc/file

Posted: 9/5/2022 8:10:47 PM
Buggins

From: Theremin Motherland

Joined: 3/16/2017

Uses my standard buffer for drive and sensing via the power rails, and something like a single CMOS inverter for some gain.  I like this approach because it somewhat isolates the CMOS I/O from the coil.  The bipolar supply simplifies the inverter model, and wouldn't exist in the real circuit.


Interesting.
lvc1gu04 is simulates ok here.

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