Re: RFI isolation

to: Matt

If you are running a sync RSG you shouldn't be using a motor controller.
The motor should run at it's designed speed of either 1800 or 3600 RPM
depending on whether you are using the 2 or 4 electrode setup.  It is called
a "synchronous" RSG because the motor should run at precisely one speed in
direct sync with the 60 Hz line frequency.  You should not increase or
decrease the speed of the motor.

You may be using the controller to rotate either the motor or the electrode
assembly.  In this case why not just use a small DC motor with a few diodes,
caps, and good old small 1-3 amp variac?  No interference problems.
Remember the K-I-S-S acronym??

Happy coiling,

Dr. Resonance

-----Original Message-----
From: Tesla List <tesla-at-pupman-dot-com>
To: tesla-at-pupman-dot-com <tesla-at-pupman-dot-com>
Date: Monday, September 06, 1999 3:11 AM
Subject: RFI isolation

>Original Poster: "Matt Behrend" <electronxlc-at-earthlink-dot-net>
>Hi all,
>I have built a digital motor controller for my sync RSG.  It is
>malfunctioning due to picking up RFI on each firing of the gap.  The
>circuit is enclosed in an aluminum box.  There several wires that go
>outside the box, but they are optoisolated and I have ruled out the
>possibility of RFI getting in on these.  The RFI is definitely passing
>through the box and hitting the logic circuitry.  I have 0.01 uF caps
>next to each chip and the power supply is well-filtered.
>I have tried grounding the box and leaving it unconnected to
>anything.  Could you please give me some suggestions for
>blocking this RFI.
>Matt Behrend