Build an Electro-Theremin or Tannerin

Posted: 1/21/2008 3:24:43 PM

Joined: 1/19/2008

Hmm... It would work just fine, and it is nice in the sense that it would give you four different waveforms and a practically linear control, however it would be susceptible to drift, but mine seems to be quite stable. Anyway, my circuit uses a 555 timer as a voltage controlled oscillator. I have never been bothered by the fact that my circuit isn't linear. Theremins aren't linear either, so I was happy.
Posted: 1/24/2008 3:13:49 AM

Joined: 1/24/2008

I have a version of the electro-theremin that works quite nicely. It was made by Mike Beauchamp of Canada, and he sells them. You can see his web site:
Posted: 1/24/2008 6:03:03 AM

From: Germany, near Munich

Joined: 11/20/2007

...sorry, I might be a little off, but, are you looking for something like this:

I did use the 'R2M' in my 'very noisy intro' - which is available for listening at my MySpace-site at; with it I control an synthesized accordeon, which is then routed through some filters...ok, it sounds more like a guitar or bass ;o) - the same effect can be achieved using a theremin, passing the audio through the MIDI-Wave, btw...
Posted: 1/24/2008 10:52:15 AM

Joined: 1/19/2008

Actually, a ribbon controller such as that one would be awesome! It has a control voltage output, which is perfect, since that is all that would be needed to control the circuit in the Tannerin. Linearity would still be a problem, but I don't think that that is a big deal. I wish I could get my hands on one so I can play with it...

And I do know about the Therevox, and I'm sure that it is superior to mine. However, I was quite short on funds, so I had no choice but to build one myself.
Posted: 1/24/2008 12:19:21 PM

From: Colmar, France

Joined: 12/31/2007

I found a nice article explaining the linear vs. exponential problem:
Posted: 1/24/2008 1:33:12 PM

From: Croxley Green, Hertfordshire, UK

Joined: 10/5/2005

[i]However, I have never been able to find a multi-turn logarithmic pot, so I'm stuck.[/i]

Probably it's a silly suggestion, but could you fit a fusee ( onto a linear multiturn pot to make it respond logarithmically?

Posted: 1/24/2008 3:08:45 PM

Joined: 1/19/2008

Oh, yeah. I remember a Leonardo da Vinci drawing that used just such a device. It would probably work very well, but unfortunately, I don't have the equipment to make an accurate fusee. I'll still look into it. Thanks for the idea!
Posted: 1/27/2008 7:41:22 PM

From: Toledo, Ohio United States of America

Joined: 2/22/2006

To build an accurate fusee, one would need a lathe. I have one with a two inch throw, and I can use it efficiently. If you require a larger radius, my Dad has a four inch throw lathe.
My Dad's lathe could easily make both the shapes required for the fusee. Nylon would be the best material for this application. Interested?
Good Luck!

Posted: 2/14/2008 12:56:52 PM

Joined: 1/19/2008

I've finally uploaded pictures of my Tannerin. Again, I posted them to my LiveJournal account. You can get to them here:

If you want some descriptions of the pictures, or more information, let me know!

You must be logged in to post a reply. Please log in or register for a new account.