Sorry Lads, really dumb opamp question

[harry]

Sometimes the resistor-less unit does not work so well
with all op-amps and loads, especially capacitive loads.
Putting a resistor between the output and the inverting
input can help these cases. I suspect the mechanism is that
the input is decoupled a little from the output by the RC
of the resistor and the input capacitance. Usually I just'
use the resistor-less method, but its good to have the trick
if you need it.

H^)  harry

Ken Stone wrote:

> It's called a voltage follower.
> - input is connected to the output.
> The signal is fed into the +  input.
>
> Works fine.
>
> Ken
>
> >Apologies in advance! For a while now, if I want a non
> >inverting buffer, I take a dual opamp wire a 10k input
> >resistor to the neg. input, take another 10k, connect
> >one end to the neg. input then connect the other end
> >to the output, this output I then connect this to
> >another 10k input resistor to the other opamp which
> >has a 10k feedback resistor. The output of this is a
> >non inverting buffer amp.
> >The question is, would this function happen if I made
> >a resistor free non inverting buffer out of one opamp?
> >anyone know? regards, Ken
> >
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> Ken Stone   sasami at blaze.net.au
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