[sdiy] Silly question about followers

[Oren Leavitt]

David G. Dixon wrote:
> Here's a silly question, but I just want to make sure I'm correct before
> eliminating an inconvenient buffer from a circuit I found on the web:
> 
> Is there ever a reason to place a follower after an inverting summer?  The
> output impedance from an inverting summer is just as tiny as that from a
> follower, so nothing would be gained by re-buffering the output, correct?
> 
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Hi David,

Do you have a link to the circuit in question?
For starters, some op-amps (like the CA3140) cannot drive a low 
impedance load (less than 2K), and are usually buffered when interfaced 
to the "outside world".

- Oren