Resistance Modulation

Discussion in 'General Electronics Chat' started by cloudy1, Jan 5, 2013.

  1. cloudy1

    Thread Starter New Member

    Jan 5, 2013
    1
    0
    I'm working on an audio circuit and need to modulate resistance up and down.
    I know how to do this with an LED and photo resistor, but photo resistors are to slow. Is there any other way to sweep resistance up and down with out using a photo resistor? Thanks.
     
  2. JMac3108

    Active Member

    Aug 16, 2010
    349
    66
    How about a digital potentiometer controlled by a micro?
     
  3. GopherT

    AAC Fanatic!

    Nov 23, 2012
    6,073
    3,856
    Phototransistor is very fast.
     
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