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  1. Replies
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    CorBee, you should open a new thread on Bat...

    CorBee, you should open a new thread on Bat detection.
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    Here is the LTspice simulation 14058 I replaced...

    Here is the LTspice simulation
    14058
    I replaced the BC250C by an 2N5089 (also an 100 mA collector current type).
    blue is input
    red is output (differential)

    here comes your latest schematic...
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    I hope you can see that the schematic in #29 is...

    I hope you can see that the schematic in #29 is not equivalent to the schematic of the link
    (I only talk about the active part that constitute the preamp, not the filtering of the supply, or the...
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    Are you using the circuit shown un post #29?...

    Are you using the circuit shown un post #29?
    either it shows wrong resistors or it can not work.
    The first collector resistor is with 100 k far too high, putting that to 4.7 k I get a 20 dB gain....
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    If you are flexible with sampling you could use...

    If you are flexible with sampling you could use
    F_CPU= 180MHz and Mult=1, Div=2 to get 175.78 kHz

    if you only record (no processing)
    you could use
    F_CPU= 49 or 96 MHz and MULT=2 , Div=2 to...
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    What is your F_CPU? the noise floor is...

    What is your F_CPU?
    the noise floor is definitely depending also on the inherent jitter, when you generate the I2S signals.
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    The MEMS output impedance is 400 Ohm, so I would...

    The MEMS output impedance is 400 Ohm, so I would put the input resistor much higher or take it out to not to 'short' the microphone (there is no line transmission effect, where matching is required)...
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    Yes, only the (relative) transition band seems...

    Yes, only the (relative) transition band seems for 192/240 kHz not as sharp for 44.1 or 48 kHz
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    What I mean, if you use a resister (e.g. a 100...

    What I mean, if you use a resister (e.g. a 100 Ohm) on the ADC input to AGND, the results you get reflects the thermal noise generated by the small current through the resistor.
    what one would...
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    Any experience on the spectral ADC noise floor...

    Any experience on the spectral ADC noise floor 192 kHz re 96 kHz say 100 Ohm resistor on input?
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    For a single channel you should be possible to do...

    For a single channel you should be possible to do the two real valued 1024 point FFT. You may have to run the T3.6 at 240 MHz.
    The audioshield, however, may not be of use. The SGTL5000 goes only up...
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