From owner-freebsd-small Wed Mar 31 8:50:55 1999 Delivered-To: freebsd-small@freebsd.org Received: from tellink.net (pm-4-7.tellink.net [208.3.160.184]) by hub.freebsd.org (Postfix) with ESMTP id B860C15C92 for ; Wed, 31 Mar 1999 08:50:19 -0800 (PST) (envelope-from chip@tellink.net) Received: (from chip@localhost) by tellink.net (8.9.1/8.9.1) id LAA16081; Wed, 31 Mar 1999 11:49:54 -0500 (EST) (envelope-from chip) Message-ID: <19990331114953.A16012@expi> Date: Wed, 31 Mar 1999 11:49:53 -0500 From: Chip Marshall To: Bertrand Petit Cc: freebsd-small@freebsd.org Subject: Re: MP3 playing PicoBSD Reply-To: cmarshall@expi.com References: <19990329141738.A12556@expi> <19990330135615.A22066@phoe.netdev.net> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Mailer: Mutt 0.93.2i In-Reply-To: <19990330135615.A22066@phoe.netdev.net>; from Bertrand Petit on Tue, Mar 30, 1999 at 01:56:15PM +0200 X-Real-OS: FreeBSD holly 3.0-RELEASE FreeBSD 3.0-RELEASE Sender: owner-freebsd-small@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG On Tue, Mar 30, 1999 at 01:56:15PM +0200, Bertrand Petit wrote: > The difficult part in this project is the hardware. As the aim > is to build an audio playing unit, the harware must be conceived such > that there is no need for cooling at all. Could modern processors be > underclocked enough so that no fan is required? Maybe a big heat sink > could do. The power source also must bear the absence of fan. These points were brought up in Fromme's discussion of the project, and I believe that a low-end AMD K5 would provide enough power to decode MP3, but not generate all the much heat. Also, since the only things in the box are the mboard, CD-ROM, and a sound card (and maybe an ether card) a very small power supply would do. But these are pretty much the same conclusions that Fromme came to, only I think his plan was with a Pentium 90. > Another big issue is the digital to analogue converter. One > could not use average PC soundcard as they are poorly shielded if > shielded at all. I think the lambda sound cards rate as low-fi. I hadn't really given much thought to this. I was just planning on using an old SB16 I had lying around. It there a way to improve shielding on these? -- Chip Marshall Exploration Physics International, Inc. Internet Technology Programmer http://www.eboai.org/~chip/ InterNIC handle - CLM21 PGP key available on my web page On IRC via EFnet as Magus To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-small" in the body of the message