X-Authentication-Warning:	delorie.com: mail set sender to geda-user-bounces using -f
X-Recipient:	geda-user AT delorie DOT com
X-Authenticated-IP:	207.224.51.38
Mime-Version:	1.0 (Apple Message framework v1084)
Subject:	Re: [geda-user] Design suggestions...
From:	John Doty <jpd AT noqsi DOT com>
In-Reply-To:	<201112211909.pBLJ9GKo018193@envy.delorie.com>
Date:	Wed, 21 Dec 2011 12:16:51 -0700
Message-Id:	<442E27EF-BB32-414E-9FE1-80D48258C9F9@noqsi.com>
References:	<CALSZ9godJsJDhBd_PaCiWPx9M8GyKz8PW1wVUs6NxVgtrOS-Fw AT mail DOT gmail DOT com> <201112211816 DOT pBLIGsaf016475 AT envy DOT delorie DOT com> <4EF229B4 DOT 8050008 AT ecosensory DOT com> <201112211909 DOT pBLJ9GKo018193 AT envy DOT delorie DOT com>
To:	geda-user AT delorie DOT com
X-Mailer:	Apple Mail (2.1084)
X-MIME-Autoconverted:	from quoted-printable to 8bit by delorie.com id pBLJGtHv019019
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

On Dec 21, 2011, at 12:09 PM, DJ Delorie wrote:

> 
>> That, and add a little capacitance to the DC motors/potentiometers
>> so PWM of them effectively creates a sigma delta DAC with an output
>> smoothing filter.
> 
> I'd assumed rotor inertia would be sufficient, but I suppose "that
> depends" as usual.
> 

The problem with added capacitance is that it increases the dissipation of the driver, since it then has to charge/discharge the capacitors when it switches. With enough capacitance to smooth the waveform, this will be a big effect.

John Doty              Noqsi Aerospace, Ltd.
http://www.noqsi.com/
jpd AT noqsi DOT com

- Raw text -