Re: 9VAC from 5VDC?

From: Jim Brain <>
Date: Fri, 13 Sep 2013 19:41:36 -0500
Message-ID: <>
On 9/13/2013 2:57 PM, Gerrit Heitsch wrote:
> On 09/13/2013 09:15 PM, wrote:
>> On 2013-09-13, at 05:33, Jim Brain wrote:
>>> Does anyone have ideas (or could point to a person or company) that 
>>> might have a way to safely synthesize an isolated 9VAC for the 
>>> machines from 5VDC?
>> Yes, that's one of the things, I'd like to see solved for good as 
>> well. I was approaching it from different angles. Even "invented" PWM 
>> based sine-wave generation once before sleep ;-) The problem always 
>> was that in the end one needs a transformer, which is what I always 
>> wanted to avoid in the first place..
> You can't. There is no way around a transformer in this case.

I'm not opposed to a transformer.  I have, I think, the other piece

o uC DSS implementation (2 of them, one is a R2R implementation and 1 is 
a PWM implementation), coupled with a power transistor and a RC filter 
to smooth out the waveform.

Now, if I could just find a 1:2 transformer that would handle 9VAC (9W?) 
and work at 50 and 60 Hz, I'd be golden.

But, I know *NOTHING* about inductors and transformers.  I faintly 
remember taking a part of a course on them in college, but nothing stuck.

So, Bil et al, help would be appreciated.  I looked at Coilcraft, and 
saw some step down and forward mode transformers, but I need the 
reverse, I think.


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Received on 2013-09-14 01:00:04

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