Return-Path: Received: from mtain-mb05.r1000.mx.aol.com (mtain-mb05.r1000.mx.aol.com [172.29.96.25]) by air-da02.mail.aol.com (v129.4) with ESMTP id MAILINDA023-863a4cceb9cb22; Mon, 01 Nov 2010 08:59:55 -0400 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-mb05.r1000.mx.aol.com (Internet Inbound) with ESMTP id 8A14D38000127; Mon, 1 Nov 2010 08:59:53 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1PCtxv-0000C1-Hy for rs_out_1@blacksheep.org; Mon, 01 Nov 2010 12:58:23 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1PCtxv-0000Bs-56 for rsgb_lf_group@blacksheep.org; Mon, 01 Nov 2010 12:58:23 +0000 Received: from mout1.freenet.de ([195.4.92.91]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1PCtxu-00047P-HY for rsgb_lf_group@blacksheep.org; Mon, 01 Nov 2010 12:58:23 +0000 Received: from [195.4.92.13] (helo=3.mx.freenet.de) by mout1.freenet.de with esmtpa (ID dl4yhf@freenet.de) (port 25) (Exim 4.72 #3) id 1PCtxt-0005hO-Jj for rsgb_lf_group@blacksheep.org; Mon, 01 Nov 2010 13:58:21 +0100 Received: from blfd-4db18c7b.pool.mediaways.net ([77.177.140.123]:3192 helo=[192.168.0.101]) by 3.mx.freenet.de with esmtpsa (ID dl4yhf@freenet.de) (TLSv1:CAMELLIA256-SHA:256) (port 465) (Exim 4.72 #3) id 1PCtxt-00021K-BC for rsgb_lf_group@blacksheep.org; Mon, 01 Nov 2010 13:58:21 +0100 Message-ID: <4CCEB96B.7040303@freenet.de> Date: Mon, 01 Nov 2010 13:58:19 +0100 From: wolf_dl4yhf User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; de; rv:1.9.2.12) Gecko/20101027 Thunderbird/3.1.6 MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: <5CBE27ADCAB64F70BF302C0DC77D7964@Uwe> In-Reply-To: <5CBE27ADCAB64F70BF302C0DC77D7964@Uwe> X-Spam-Score: 1.4 (+) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001,RATWARE_GECKO_BUILD=1.426 Subject: Re: LF: Variometer drive with stepper motor ? Content-Type: multipart/alternative; boundary="------------020305010603060803080603" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: * X-Spam-Status: No, hits=1.0 required=5.0 tests=HTML_20_30,HTML_MESSAGE, HTML_TITLE_EMPTY autolearn=no version=2.63 X-SA-Exim-Scanned: Yes Sender: owner-rsgb_lf_group@blacksheep.org Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rs_out_1@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false x-aol-global-disposition: G x-aol-sid: 3039ac1d60194cceb9c91695 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none X-Mailer: Unknown (No Version) --------------020305010603060803080603 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Hello Uwe, I made an extremely simple 'driver unit' for a 4-coil stepper motor for a magnetic loop years ago. The 'driver' didn't contain any electronics at all : Just a homemade PCB with a central axis, a wiper (from an old relais contact), and sizeteen copper segments on the PCB connected to the four coils in a 1-2-3-4-1-2-3-4-1-2-3-4-1-2-3-4 sequence (1..4 = coil numbers). So when turning the wiper 1 turn clockwise, the motor did sixteen steps clockwise, and vice versa. A crank handle made the unit a bit more user-friendly, also for quick rotation. I thing the motor had 3.5 degrees per step, so the loop tuning was very accurate (and reproducable if the number of turns on the 'driver' side was counted). 73, Wolf DL4YHF . Am 01.11.2010 11:10, schrieb Uwe Wensauer: > Hi > would like to drive ( tune) Variometer with stepper motor > Any idea or hints ? > 73 > Uwe, dk1kq --------------020305010603060803080603 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Hello Uwe,

I made an extremely simple 'driver unit' for a 4-coil stepper motor for a magnetic loop years ago.
The 'driver' didn't contain any electronics at all : Just a homemade PCB with a central axis, a wiper (from an old relais contact), and sizeteen copper segments on the PCB connected to the four coils in a 1-2-3-4-1-2-3-4-1-2-3-4-1-2-3-4 sequence (1..4 = coil numbers). So when turning the wiper 1 turn clockwise, the motor did sixteen steps clockwise, and vice versa.
A crank handle made the unit a bit more user-friendly, also for quick rotation. I thing the motor had 3.5 degrees per step, so the loop tuning was very accurate (and reproducable if the number of turns on the 'driver' side was counted).

73,
Wolf DL4YHF .

Am 01.11.2010 11:10, schrieb Uwe Wensauer:

Hi

would like to drive ( tune) Variometer with stepper motor

Any idea or hints ?

73

Uwe, dk1kq

--------------020305010603060803080603--