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digital potentiometer

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radium98

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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 .
 

Something like the Maxim dual Up/down ones may do what you want. **broken link removed**

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

Keith.
 

Hi,
I think, these will be usefull? :)
**broken link removed**
**broken link removed**
**broken link removed**
K.
 

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