General > General Technical Chat
band pass filter for an audio application
dmills:
When a simulator says 'No', it is probably correct, when it says 'Yes' that should be read as 'Maybe'...
Sims are only ever as good as the models and a LOT of the models leave something to be desired.
Any time you have an active filter with half gig ohm resistors AND sub 100 ohm resistors I would be looking very, very askance at it, and probably doing it in two stages in pursuit of a more reasonable design. It COULD be a reasonable design, but it is a design smell.
Benta:
@dmills:
You speak to my heart :)
Coordonnée_chromatique:
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:
My electronic circuit doesn't really require the genus level IMHO, but it is high enough to turn a mechanical diplomed guy lazy, i'm curious about what should be happened if i chain mainy stages at the same frequency.
Through the component values derivations the center frequency should not be exactly the same and i'm perhaps stupid but i'm immagine that should face some audible IMD issues.
2N3055:
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.
Coordonnée_chromatique:
--- 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 ?
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