sinusoidal amp voltage control with dc one.????

[hanifmoallem]

hi.
i have sinusoidal voltage that want to change its amplitude with dc voltage.
in fact i want to control it. what shal i do?
plz help me if you know an IC that do this for me.
it's too important. it's my university project.
thanks.

 

[LvW]

There are several IC's called VGA (variable gain amplifier) which offer the possibility to control the gain with a dc voltage.

 

[karesz]

Hi,
And what about frequency/amplitude range/usable power supplies & load pls?
K.

 

[hanifmoallem]

i have 800Khz sinosuidal voltage whit the range of 15v. the load is transformer.