A 12V *AC* power supply

[Alon Barzilai]

On 7/13/2010 9:13 AM, Shachar Shemesh wrote:
> Hi list,
>
> I bought a USB connected logic analyzer for too much money (not that 
> much). When buying, I did a mistake and not thought through the 
> issues, and bought from a US supplier without telling them this needs 
> to be a 220V country. As a result, I got an external power supply that 
> is 110V, which outputs 12V AC at 1000mA (why they do not write "1A", I 
> do not know).
>
> To my shame, I actually bought a universal DC supply without noticing 
> that it's AC I need, and started a support call with the company. They 
> were very nice, and when we, finally, found out the source (I hope it 
> is it), the guy said I could probably get by with 18VDC, but it would 
> strain the capacitors (my math suggests that 15VDC is closer to the mark).
>
> So, does anyone know where I can get a 12V AC power supply? They are 
> not exactly a commodity.ji.ac.il/mailman/listinfo/linux-il
first, make sure it will work with 50Hz ( instead of 60Hz)
you can take a 1000ma (or more) low end power supply
( the heavy ones, with lots of copper inside)
open it up, and remove a small electric circuit with diodes and capacitor(s)
connect the 2 wires from the coil to the output.

Alon.