[sdiy] Op Amp Buffer stability

[Tom Wiltshire]

Usual practice in this situation is to put the large capacitor  
between ground and VCC/2 (e.g. in parallel with the lower resistor in  
the voltage divider.

I haven't seen anyone do it your way, but if it works just as well,  
why not?

T.

On 24 Sep 2009, at 14:29, Justin Owen wrote:

> Hello,
>
> I'm on a bit of a power supply stability mission at the moment.
>
> I'm using an Op Amp buffer/voltage follower to supply VCC/2 (10K  
> Resistor from VCC and 10K Resistor from Ground - both to Non  
> Inverting Input).
>
> I've noticed that putting the positive side of a 10uF electrolytic  
> cap on the Inverting input and running the Negative side of the cap  
> to Ground has drastically smoothed the output of the buffer.
>
> Is there a reason why I *shouldn't* be doing this? I can't find an  
> example of anyone using this on a buffer anywhere - so I'm a little  
> cautious.
>
> Oh - any other low component count, power supply stability tips  
> would be most welcome.
>
> FWIW VCC is 9 Volt.
>
> Thanks all,
>
> Justin
>
>
>
>
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