RE: 9VAC from 5VDC?

From: Bil Herd <>
Date: Sun, 15 Sep 2013 18:11:43 -0400
Message-ID: <>
I posted an example of how to do a 5VDC/9VAC convertor using the first
transformer I found on Digikey that matched thebasic specs , there are
probably all kinds that would work. The design is two single-ended to
ground drivers which I show as TIP120 just for current and gain without
worring about the parameters.  Transformer can be a Single Primary 110V to
48 VAC Centertap secondary or I showed a dual primary with the 110V
primaries wired in series and 24 VAC Centertap.   I have not tested the
design or done the real exact 2nd level of math, this is an example of how
I have done this in the past.


-----Original Message-----
[] On Behalf Of
Sent: Sunday, September 15, 2013 5:59 PM
Subject: Re: 9VAC from 5VDC?

On 2013-09-15, at 07:49, Jim Brain wrote:

>> I believe they used 24VAC for landscape irrigation valves and outdoor
>> lighting.
> Ah yes, they do.
>> A switcher would be smaller/cheaper.
> I agree switchers are smaller and cheaper, but I don't see anyone
selling a switcher that does 9VAC.  I've asked... on two continents.

True - SX-64 is no longer being produced ;-) But - BTW - it might be good
to check what transformers (they were pretty small) CBM used in the SX
PSUs. Maybe those (or similar) are still available.

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Received on 2013-09-15 23:00:07

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