[sdiy] More Theremin - WHY??

[Grant Richter]

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.

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.

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.

As I recall, the Etherwave docs say it runs around 160 kHz, so lower
frequencies seem to be prefered.

From: PRCamann at aol.com
Date: Mon, 23 Aug 2004 00:00:14 EDT
To: harrybissell at prodigy.net, grichter at asapnet.net
Cc: synth-diy at dropmix.xs4all.nl
Subject: Re: [sdiy] More Theremin - WHY??


In a message dated 8/22/2004 11:20:28 PM Eastern Daylight Time,
harrybissell at prodigy.net writes:
I have what seems to be a 100mH choke in the circuit as antenna decoupling
And Grant used a 60mH inductor.  And once again I ask, do you have any
suggested part numbers?
 
Paul Camann



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