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

[Seb Francis]

50 Hz isn't critical .. anything near would do.  In UK this is the 
standard mains frequency so would be no problem getting a cheap 
12VDC->240VAC 50Hz inverter and plugging in a 240V->12VAC transformer.  
But there must be a better way than this!


Bob Weigel wrote:
> Hmm.  I'd say..you can get really small inverters super cheap now.  
> Just plug a 12VDC adapter into one :-).  Not the most power efficient 
> way maybe but probably the most economical if your time is worth 
> anything. Oops...does it have to be 50hz?  Well you can probably find 
> a cheap 50hz inverter too..never shopped for those.  -Bob
>
> Seb Francis wrote:
>
>> 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
>>
>>
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>