<HTML>
<HEAD>
<TITLE>Re: [sdiy] More Theremin - WHY??</TITLE>
</HEAD>
<BODY>
At the time, the largest choke Mouser carried was 20 mH (20,000 uH). They now seem to carry a 100 mH coil (100,000 uH) under part number 542-70F101 for $3.10.<BR>
<BR>
Theremin never published a design guide (that I know of), so all Theremin designs are tweaked in by the designer. Bob's work very well because he has spent so many years perfecting them.<BR>
<BR>
The fixed oscillator frequency, length of run to antenna and antenna shape will all affect the series inductor size. But I do know (experimentally) that the series inductor is the key to expanding the control range.<BR>
<BR>
As I recall, the Etherwave docs say it runs around 160 kHz, so lower frequencies seem to be prefered.<BR>
<BLOCKQUOTE><BR>
<B>From: </B>PRCamann@aol.com<BR>
<B>Date: </B>Mon, 23 Aug 2004 00:00:14 EDT<BR>
<B>To: </B>harrybissell@prodigy.net, grichter@asapnet.net<BR>
<B>Cc: </B>synth-diy@dropmix.xs4all.nl<BR>
<B>Subject: </B>Re: [sdiy] More Theremin - WHY??<BR>
<BR>
</BLOCKQUOTE><BR>
<BLOCKQUOTE>In a message dated 8/22/2004 11:20:28 PM Eastern Daylight Time, harrybissell@prodigy.net writes:<BR>
<BLOCKQUOTE><FONT FACE="Arial">I have what seems to be a 100mH choke in the circuit as antenna decoupling<BR>
</FONT></BLOCKQUOTE><FONT COLOR="#010101">And Grant used a 60mH inductor. And once again I ask, do you have any suggested part numbers?<BR>
</FONT> <BR>
<FONT COLOR="#010101">Paul Camann<BR>
</FONT><BR>
</BLOCKQUOTE><BR>
</BODY>
</HTML>