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band pass filter for an audio application
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2N3055:

--- Quote from: Coordonnée_chromatique on March 17, 2022, 10:03:11 am ---
--- Quote from: 2N3055 on March 17, 2022, 09:49:12 am ---Why is a "half a gigaohm" value being discussed? Largest resistor in that schematic is 400 kOhm.
And venerable TL071 (the JFET version) would work well in this circuit.

My recommendation to OP is that it is time to make a prototype.
Get few different capacitor types. Try them.

You can measure it with sound card and software...
Be creative. Try not to blow up something.
Have fun experimenting.

--- End quote ---

Thanks for you encouagements (was needed  ^-^)
I've experenced some phase revesal, oscillations and hard clipping with the NE5532 and find it too touchy for my skills even if i've succeed to use it sometimes.
All my circuits are stable with the TL071, but larges resistors are prone to be noisy, aren't they ?

--- End quote ---

It is physics that larger resistors have larger noise. But engineering is not about perfection but about art and science of compromise. Depending on signals and where in signal chain you are noise might be low enough not to be a problem.

Serously, that is 2-3€ worth of components. Just cobble it together and try it. Measure with sound card and some of excellent audio measurement applications. You need to learn all of it..It's all useful.
You will make mistakes. Learn from them too..
Coordonnée_chromatique:

--- Quote from: dmills on March 16, 2022, 08:44:04 pm ---Sallen and Key topologies are notoriously 'interesting' once the opamp runs out of GBP so I would at least be opening the plot out to see what happens in the top couple of octaves (The lowpass version of things have a bad habit of coming back once the opamp is out of puff).

--- End quote ---

I was thinking to have undertstand (very fast) what you've said (without inverstigations) but now i'm sure that i was wrong after few nights (still no investigations).
Are you talking about wavelets ?
jonpaul:
Cher Monsieur bonjour je attends avec impatience pour votre réponse précise le application et spécifique le filtres

Dynamique range, noise floors, Q THD, frequency etc

Cordialement


Jon
tooki:

--- Quote from: Coordonnée_chromatique on March 17, 2022, 09:14:49 am ---Simulators are made by engineers for those that need an approach without any expertise about a new subject that they've never faced of and...  :blah:

--- End quote ---
LOL that couldn’t be more untrue.
jonpaul:
Rebonjour, Simulators like any tool have their uses, misuse and limitations. My only experience was with the great Magnetic Designer of IntuSoft for transformers and inductors.



I found its easier to built a simple protp than to simulate, and that many simulators are giving a misleading result...GIGO, garbage in Garbage out.

Any serious simulation can point the way to a solution but building and testing hardware is still required.

Jon
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