A Transistorized Theremin - parts issues

Posted: 1/28/2012 11:17:19 AM

Joined: 1/28/2012

Hello All!

This is my first time here as a poster, though I have been reading many posts of this great forum, and have been informed by the site for a while now. I am a musician, and have no real education about electronics, other than theoretical knowledge from highschool, and some simple schemas I have built as a child.

I have been fantasizing about building a thermein for a couple of years now, and am trying to manifest it now. I have taken the moog scheme (http://www.theremin.info/-/viewpub/tid/10/pid/49) and have found most of the parts I need around some old electronic stores (the main issue till now was the germanium transistors, having a high internet price - but I found some for quite cheap!). Anyway, I am now up to build the coils, as instructed by the article, but I have found the instructions to be pretty vague (here is the missing page from there, that has the instructions: http://moogarchives.com/there61c.htm). Can anyone spare a tip, about how is the best way to construct those for the amateur, or how to replace them with factory parts? The parts on the scheme have no specifications other than the building instructions.

Thanks alot!! 

Posted: 1/29/2012 8:59:30 PM

From: Colmar, France

Joined: 12/31/2007

Just search for a datasheet of the indicated coil former. This will give you the exact winding diameter and the Al-Value of the ferrite core which will allow you to calculate approximately the different inductance values and estimate the coupling factor. The rest is simple RF engineering.

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