RE: 9VAC from 5VDC?

From: Bil Herd <*bherd_at_mercury-cg.com*> Date: Mon, 16 Sep 2013 17:10:59 -0400 Message-ID: <dccb1923ade94f9d4c996bdb83d647a8@mail.gmail.com> · bherd_at_mercury-cg.com

Given how cheap a 9VAC wall-mount transformer I, why would it not be
better than a 5VDC-9VDC convertor?  Also the 5v supply would need to
handle an addition 1.25 Amps at a guess, what is the 5V supply in this
case?

Typically circuits that use a sign wave are concerned with the
zero-crossing point and not so much the peak or what the shape is near the
peak.  Not saying all uses do this, it is just my experience to-date.

-----Original Message-----
From: owner-cbm-hackers@musoftware.de
[mailto:owner-cbm-hackers@musoftware.de] On Behalf Of silverdr@wfmh.org.pl
Sent: Monday, September 16, 2013 4:57 PM
To: cbm-hackers@musoftware.de
Subject: Re: 9VAC from 5VDC?

On 2013-09-16, at 22:28, MikeS wrote:

> What about frequency/stability? Do any add-on devices rely on the 9VAC
for an RTC?

IMHO they shouldn't. RTCs I saw rely on its own crystal. And if there is
one that wants to use the AC frequency - it implies immediately that the
accuracy is not the top priority there. I am more concerned about some
potential influence like unwanted noises/hums, etc in analogue add-ons.
(modems? audio add-ons?)

-- 
SD!
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