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madhurendra

Joined Nov 24, 2011
4
hi all,

can anybody help me, how to vary amplitude of a waveform or pulse using micro controller and pushbutton switch. I dont want to use POT.
 

bertus

Joined Apr 5, 2008
19,944
Hello,

You could take a look at the LM13700 transductance amplifier.

Bertus
 

SgtWookie

Joined Jul 17, 2007
22,201
You could also use an R-2R ladder.
You should buffer the input signal using an opamp wired as a voltage follower.
 

MrChips

Joined Oct 2, 2009
19,159
You could use a digital pot such as Microchip MCP41010 or Maxim DS1267, for example.
 
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