On Thu, 10 Jul 2003 15:53:50 -0400, you wrote:

>> I'm trying to figure out how to generate a range of voltages between 0
>> and 150mV in 30mV steps (ie: 0, 30, 60, 90, 120, 150 mV).
>
>What accuracy?  What response time?
>
>> I have pondered two methods so far but I am sure there is a simpler
>> method of doing this.
>>
>> First method is to setup a PWM output to an RC filter with a unity =
gain
>> op amp for buffering. I've never done this before and everything I =
read
>> on PWM shows it operating in the 5V range. Maybe a scaling op amp on =
the
>> output?
>
>You don't need an opamp to scale a 5v signal to 150mV, just two =
resistors.
>This is only one resistor more than needed by the first R/C filter =
stage,
>so is easy to do.
..but you do if you want sensible output impedance.

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