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  1. #1
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    digital potentiometer

    hi all
    i need some help with pcb project etc...
    i have an anlog potentiometer 10kohms that drive the base of a power npn transistor to varie at the output the voltage i mean voltage control via analog pot,i need to know can anyone help me i need a design of a didital pot by analog ic or pics that i touch a buttom the impedance increase when touching another buttpm the impedance decrase like a digital volume control up and down maybe via pwm i m not so familiar with these but for a transistor voltage control this is an important thing to me thanks .

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  2. #2
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    digital potentiometer

    Something like the Maxim dual Up/down ones may do what you want. http://www.maxim-ic.com/datasheet/index.mvp/id/2568

    You will need to supply a clock (a 555 would do) and a bit of logic for the up/down.

    Keith.
    I started life with nothing and I've still got most of it left. (Seasick Steve)



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