X-Authentication-Warning: delorie.com: mail set sender to geda-user-bounces using -f
X-Recipient: geda-user AT delorie DOT com
Subject: Re: [geda-user] Stepper Driver Question
To: geda-user AT delorie DOT com
References: <CALSZ9grFdpWEWyU2LFhoDfSYCmXatFohBFyxNGfXdS-SnZ7pBw AT mail DOT gmail DOT com>
 <201602122040 DOT u1CKeFdl011276 AT envy DOT delorie DOT com>
 <CALSZ9grg5djJGDUU6jEeda2M0oGd93+VNjDQaOMjgvNdN9w7rg AT mail DOT gmail DOT com>
 <CALSZ9gpCh+gEutp7OKiM9r-ThethGwvGSG3zQnTsSoc2_FyG7g AT mail DOT gmail DOT com>
From: "P. Taylor" <phil AT plastitar DOT com>
Message-ID: <56BE52D6.1080706@plastitar.com>
Date: Fri, 12 Feb 2016 16:47:02 -0500
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:38.0) Gecko/20100101
 Thunderbird/38.5.1
MIME-Version: 1.0
In-Reply-To: <CALSZ9gpCh+gEutp7OKiM9r-ThethGwvGSG3zQnTsSoc2_FyG7g@mail.gmail.com>
Content-Type: text/plain; charset=utf-8; format=flowed
Content-Transfer-Encoding: 8bit
X-AntiAbuse: This header was added to track abuse, please include it with any abuse report
X-AntiAbuse: Primary Hostname - omega.hrwebservices.net
X-AntiAbuse: Original Domain - delorie.com
X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12]
X-AntiAbuse: Sender Address Domain - plastitar.com
X-Get-Message-Sender-Via: omega.hrwebservices.net: authenticated_id: phil AT plastitar DOT com
X-Authenticated-Sender: omega.hrwebservices.net: phil AT plastitar DOT com
X-Source: 
X-Source-Args: 
X-Source-Dir: 
Reply-To: geda-user AT delorie DOT com
Errors-To: nobody AT delorie DOT com
X-Mailing-List: geda-user AT delorie DOT com
X-Unsubscribes-To: listserv AT delorie DOT com
Precedence: bulk

On 2/12/2016 4:13 PM, Rob Butts (r DOT butts2 AT gmail DOT com) [via 
geda-user AT delorie DOT com] wrote:
> Here is the link to the screenshot of the driver circuit:
>
> http://postimg.org/image/y4n3hho81/
>
>
> ​

What speed of step or rotation do you expect?

That image looks very wrong to my eyes.

You can see at 3.2 kHz some down aliasing which could be the sound 
you're hearing.  Or it could be the 10k ... whatever.  It's probably not 
going  to spin up to the speed you're asking of it.

Phil