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analog vs digital potentiometers

Wharfedale Evo 4.2

sarathssca

Member
Joined
Jul 31, 2014
Messages
111
Points
18
Location
chennai, india
Hello,

Just curious to know how does normal analog potentiometers compare with i2c controlled digital potentiometers like DS1807 and compare with LED-LDR setup for volume control ?

For LED-LDR setup do we need to use optocoupler or can we use normal led and ldr and tape them together as shown in few threads here?

thanks and regards
S Sarath
 

vikoma

Member
Joined
Apr 8, 2012
Messages
85
Points
18
Location
Pune, India
My observation is that (taped) LED + LDR combination can give you full range of resistances based on current (and hence brightness) flowing through LEDs.

I have been able to measure resistances of 50 ohms (for brightest light, about 60-80mAmp current in LED) to few mega ohms when it is dark. I chose off-the-shelf 5mm LDR and brighter white LEDs. (Normal RED LEDs are not so bright, and min resistance you can get is around 125-150 ohms.)
 
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