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Re: [TowerTalk] Circuit for SteppIR controller?

Subject: Re: [TowerTalk] Circuit for SteppIR controller?
From: K4SAV <>
Date: Mon, 11 Jun 2007 09:49:18 -0500
List-post: <>
James C. Garland wrote:

>Is the schematic for the steppIR controller circuit available anywhere?  I'd
>like to take a look at the driver circuitry. From the discussion, it sounds
>like SteppIR is using a standard H-bridge  bipolar stepper driver IC. In my
>experience, those work well for stepper motors that are part of a closed,
>localized instrument. But I'd think something more robust, possibly with an
>optically coupled output stage, would be helpful for long cable runs and
>potentially varying load requirements. 
>I also understand that it's good not to put a lot of electronics out on the
>tower, but it's also asking for trouble to run a sixteen conductor cable out
>to a tower. Some sort of serial interface with a decoder at the antenna
>might eliminate a lot of these kinds of problems. How about an optical fiber
>for the control cable? Then all one would need is a 24V power source at the
>tower and there would be no worry about lightning problems.
>Jim W8ZR
Your concerns are well justified and I agree with them.  The H bridge 
driver used is an L6219DS, which is intended for a closed system.  As 
far as I know, the schematic is not available.


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