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Digital Potentiometer

lukesmith123

Jan 4, 2013
11
Joined
Jan 4, 2013
Messages
11
Hi,

I am replacing an analog potentiometer with a digital one.

I'm using the AD5220 digital potentiometer and connecting a 9v battery with a 5v 7805 voltage regulator.

My question is, when the battery is connected to the digital potentiometer via the voltage regulator, will the battery be drained even when not in use or will it only be used when the buttons are pressed from the digital potentiometer?

Should I incorporate a fixed on/off switch into my design?


Thanks,
 

(*steve*)

¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd
Moderator
Jan 21, 2010
25,510
Joined
Jan 21, 2010
Messages
25,510
Yes. Even assuming the digital pot has no quiescent current drain (which itself is unlikely), the regulator will draw some power. A 7805 might draw more than the rest of the circuit -- it's certainly not a low power device.
 
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