doncarlosalbatros
Full Member level 2
I have a sine signal Vsignal below which is AC coupled and will be buffered by an LT1490 to the line input of a MOSFET power amplifier.
I'm able to control the frequency of the Vsignal through Arduino. But I also need to control the gain through Arduino.
What approaches is possible for a variable gain? Is there any dedicated IC for such purpose? I need a variable output between 0.25Vrms to 3Vrms for instance. I have no experience on such topic. Input to LT1490 will be fixed 500mV amplitude i.e 1Vpk-pk.
How about changing Rp with a 10k digital pot as below like a MCP41010? Does anybody have experience with such use? Would that be fine if I replace MCP41010 with Rp?
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My freq. of interest if from 0.1Hz to 20Hz only.
I'm able to control the frequency of the Vsignal through Arduino. But I also need to control the gain through Arduino.
What approaches is possible for a variable gain? Is there any dedicated IC for such purpose? I need a variable output between 0.25Vrms to 3Vrms for instance. I have no experience on such topic. Input to LT1490 will be fixed 500mV amplitude i.e 1Vpk-pk.
How about changing Rp with a 10k digital pot as below like a MCP41010? Does anybody have experience with such use? Would that be fine if I replace MCP41010 with Rp?
- - - Updated - - -
My freq. of interest if from 0.1Hz to 20Hz only.
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