>> For Voltage Divider:
>> Voltage divider is 2K + 3K.
>> Power consumption factor 5V * 5V / 5KOhm =3D 5mW
>>
>> For FET & Resistor
>> Power consumption factor 5mW, thus resistor is 3V * 3V / 5mW =3D 1.8
>> KOhm
>
> Exactly. =A0But to get the same speed, meaning same signal impedence, you
> would need 1.2Kohms since 2Kohm // 3Kohm =3D 1.2Kohm.

On falling edge impedance of FET - Rds(On) - is much less than 1.2K.
On rising edge I don't see how does mentioned in your calcs 3Kohm
divider's bottom resistor help to speed the rising.


>> It's much better to synch to sharp falling edge
>> as in the "FET + resistor" approach, than to fuzzy
>> many factors dependent any edge as in "Voltage
>>Divider" case.
>
> Once again, there is no inherently better approach,
> so please stop making it sound like yours is.

Do you really want ME to adjust the sound? This kind of perception
depends on a listener, not on a speaker.


> ... What is better depends on various factors of the
> design at hand. =A0In different situations the various
> characteristics of any one approach will have different
> costs or advantages, which change which approach
> will be better per situation.

That's true.

-- =

http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist