Date: Mon, 28 Oct 2002 15:33:15 -0600 (CST) From: Chris Dillon <cdillon@wolves.k12.mo.us> To: Dag-Erling Smorgrav <des@ofug.org> Cc: Soeren Schmidt <sos@spider.deepcore.dk>, Ronald G Minnich <rminnich@lanl.gov>, <"."@babolo.ru>, David Nicholas Kayal <davek@saturn5.com>, <freebsd-chat@FreeBSD.ORG> Subject: Re: Show me the light Message-ID: <20021028152422.E36084-100000@duey.wolves.k12.mo.us> In-Reply-To: <20021028125820.I35504-100000@duey.wolves.k12.mo.us>
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On Mon, 28 Oct 2002, Chris Dillon wrote: > > You don't need a DAC, you just connect each data pin to the output > > through an appropriate resistor. Google for "covox schematics". > > Right, I know, thats exactly what I made. I just realized I never > had any diodes in the thing, just resistors. It was just a resistor > ladder. You aren't getting 8-bit resolution out of that, though, > and it is not a PCM DAC. My own memory does me a dis-service. You're absolutely right, the way those resistor ladders are designed, you really do get a rough equivalent of an 8-bit PCM DAC. I forgot that I had used lower to higher resistances for the MSB through the LSB (respectively), which would do the trick just about right. For some reason I was remembering that each bit carried an equal weight (which is certainly possible to do, just wouldn't work well at all in this situation). -- Chris Dillon - cdillon(at)wolves.k12.mo.us FreeBSD: The fastest and most stable server OS on the planet - Available for IA32 (Intel x86) and Alpha architectures - IA64, PowerPC, UltraSPARC, ARM, and S/390 under development - http://www.freebsd.org No trees were harmed in the composition of this message, although some electrons were mildly inconvenienced. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-chat" in the body of the message
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