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  1. #1
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    The magical audio filter other opamps?

    Hi I have found this filter/amp combination, being simple with nice features.

    I wonder can I use other opamps like the ne5534 or is the performance specific to the 741 and will differ if using other opamps?

    Also how about Jfet based ones like the tl071?
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    Re: The magical audio filter other opamps?

    you can use ne5534 in place of 741.

    NE5534 has better parameters than 741 like unity gain bandwidth(10Mhz) and high slewrate(13v/µsec) and lower supply voltage.
    Their equivalent noise is 3.5nv/√Hz.


    it can be a drop in replacement (except when using pin 1, 5 and 8 which is not used in the circuit attached)



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    Re: The magical audio filter other opamps?

    I agree, and it will work better than a 741.
    The caveat with NE5532 and NE5534 devices is they have head-to-toe parallel diodes across the inverting and non-inverting inputs. That isn't a problem for low signal applications but they are not replacements in comparator circuits and the likes.

    Brian.
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    Re: The magical audio filter other opamps?

    The circuit isn't particularly optimized for bipolar low-noise audio amps like NE5534, e.g. regarding resistor dimensioning. Thus a standard low noise JFET OP like good old TL071-TL074 would be my first choice,



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    Re: The magical audio filter other opamps?

    Hi

    NE5534 is not unity gain stable. Expect oscillation.

    Klaus
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