Getting a PWM to analog -5 and +5

Discussion in 'Analog & Mixed-Signal Design' started by Ah Pek, Sep 20, 2004.

  1. Ah Pek

    Thread Starter New Member

    Sep 20, 2004
    2
    0
    Any suggestions on how I can get use a PWM signal and build a simple circuit to output -5 to +5 that is nice and smooth?

    If it helps I have two PWM outputs I can use and using the PICAXE 28x I can program any period and duty cycle.

    Cheers
    Ah Pek
     
  2. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    Hi,

    If you don't need any current-carrying capacity, then the PWM output set to 100% duty cycle should give the +5. If this is the case (I am not familiar with this model PIC) then adding a inverting charge pump like the 7660 puus two 10 uF tantalum caps will give you the -5. As I said, don't expect to power anything with this setup.
     
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