On 1/14/2013 6:16 AM, Forrest Christian wrote:
> I'm looking for a way to produce a 60Hz sinewave at voltages ranging from=
 a
> couple volts all the way up to 120V RMS or higher (250 would be wonderful=
).
>   This needs to be able to be either digitally or voltage controlled.  It
> also needs to be current limited to a couple/few mA.
>
> This is for use in a piece of Automated test equipment I'm building to te=
st
> a low-volume product which measures AC line voltage and frequency.
>
> In my mind I'm thinking about the functional equivalent of a computer
> controllable DC lab power supply where you can adjust at least the voltag=
e
> and optionally current limit using an attached computer, but instead of D=
C
> it puts out AC.

What is the max  current  you need at the output ?

You could design around something like the pic16f1783  , it has=20
everything you need to control the output .   A fet used on the output=20
could be used to vary the output voltage connected to a transformer , =20
the common 120/240VAC  to 12.6VAC transformer would work well.  Connect=20
the 12.6V winding to the FET and use the transformer to step up the=20
output to 120/240 .


Mark

--=20
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