[sdiy] Buffered question

[Didier Leplae]

Would an inverting opamp circuit with feedback be less effective at buffering because of the connection between input and output via the feedback loop? 

> On Dec 29, 2020, at 9:40 AM, Mattias Rickardsson <mr at analogue.org> wrote:
> 
> 
> Hej Kristian! :-)
> 
> Your voltage follower is caller an "op-amp buffer" since it doesn't do anything else than buffer the signal.
> 
> Amplifiers, mixers, comparators, and other op-amp applications also buffer the signal, but that's not mentioned since their primary function is to amplify, mix, compare, etc.
> 
> I hope I understood your question enough. God fortsättning och gott nytt år!
> 
> /mr
> 
> Den tis 29 dec. 2020 15:42Kristian Blåsol <kristian.borgstedt at gmail.com> skrev:
>> Hello,
>> 
>> A question about opamp buffers or voltage followers. So one of those circuits makes sure that whatever you plug in to the output of the buffer wont affect whatever you have on the input of the buffer... right?
>> 
>> But there are so many different circuits you can make with an opamp, is there any of those that in itself IS a buffer, or do ALL other opamp circuits need buffering after it for the output to not affect the input?
>> 
>> For example: a comparator, isnt that already buffered in itself? Since the output is either ground or +v?
>> 
>> And how about a mixer/summing amplifier, op-amp as an amplifier, high and low pass filters.
>> 
>> Im thinking so I dont put a buffer on an already buffered signal... :)
>> 
>> Thanks in advance,
>> /Kristian
>> 
>> 
>> 
>> -- 
>> ---
>> Kristian Blåsol
>> 
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