RE: 9VAC from 5VDC?

Yeah, I pointed at those so as to not point at something that may be
incorrect by the specs.  There are random transformers around like
http://www.surveillance-video.com/mgt-598.html?productid=mgt-598&channelid
=NEXTA  for $6.20 but the specs aren't really published so it would have
to tried.  The good news is that once hooked up and running it can be
determined if it's working correctly or stressed.



-----Original Message-----
From: owner-cbm-hackers@musoftware.de
[mailto:owner-cbm-hackers@musoftware.de] On Behalf Of Jim Brain
Sent: Monday, September 16, 2013 6:05 PM
To: cbm-hackers@musoftware.de
Subject: Re: 9VAC from 5VDC?

On 9/16/2013 4:10 PM, Bil Herd wrote:
> 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?
FYI: On AC, I think the CIA uses the 60 Hz wave to clock the TOD. (50 in
some other countries).

I will admit I posted my earlier comment before looking at the cost of the
transformer alone in the design.  I was expecting $4-8, and the
$24-$30 caught me by surprise.

Yeah, at that price, it gives pause.

On amperage, I was thinking it would need to source another 2.5A at 5VDC
to make all this work (7.5VA into the transformer would provide ~.8A @
9VAC).

My thinking was that folks could readily leverage all of the cheap 5VDC
laptop power supplies around, passing the 5V through and just creating
this additional voltage using the circuit.  Others could run the design
off a 6V DC battery (the difference is minimal) and then we'd have a
portable C64, and I could make my SX portable by using such a circuit and
replacing the CRT with an LCD (1541 would be doable with a 12V battery
made up ot 2 6V cells, which could give 12V and 5V.

But, I doubt most will want a $30.00 transformer.

Probably not a huge market for such an expensive item.

Sigh.



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