[sdiy] 12VDC to 12VAC converter [OT]

Dave Magnuson resonant at hoohahrecords.com
Mon Sep 3 22:33:20 CEST 2007

----- Original Message ----- 
From: "Seb Francis" <seb at burnit.co.uk>
To: "Synth DIY" <synth-diy at dropmix.xs4all.nl>
Sent: Monday, September 03, 2007 3:42 PM
Subject: [sdiy] 12VDC to 12VAC converter [OT]

> Hi,
> Apologies for this OT post but hopefully someone on the list can save me a 
> lot of searching ...
> I need to produce a 12VAC 20VA 50Hz supply from a 12VDC input.  It's to 
> run a 12VAC motor from a car battery, so the AC voltage doesn't have to be 
> particularly sine-like or regulated.
> Any ideas of a simple circuit or IC that will do this with reasonable 
> efficiency?  I thought about a 555 timer with power transistor to boost 
> the output but not sure a square wave will be good for the motor ...
> TIA,
> Seb

Hi Seb,

with the 555 timer you can get a triangle-like wave from the timing cap. 
I've seen an LFO that did this with an opamp buffer... it would probably be 
a little more friendly than the square wave output.


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