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  1. bertus

    Maximum circuit size posting

    Hello, The maximum file size of 5.120.000 bytes can be used for posting PDF's like manuals and datasheets. Pictures can follow the ideas of @davenn . Bertus
  2. bertus

    Sallen Key Low Pass Filter, bandpass filter

    Hello, With a lower voltage drop, the evelope detector will follow the signal closer as a diode with a higher voltage drop. Bertus
  3. bertus

    Sallen Key Low Pass Filter, bandpass filter

    Hello, The breakdown voltage has nothing to do with the voltage drop. Read the wiki: https://en.wikipedia.org/wiki/Schottky_diode Bertus
  4. bertus

    Sallen Key Low Pass Filter, bandpass filter

    Hello, You don't need speed. You can select on voltage drop. Shottky diodes wil have a lower voltage drop. Bertus
  5. bertus

    Sallen Key Low Pass Filter, bandpass filter

    Hello, When you connect the mic the following parts can be deleted: V1 , R22, R18 and C18. You can change the gain with R23. I think you can go upto 470K for R23. Bertus
  6. bertus

    Sallen Key Low Pass Filter, bandpass filter

    Hello, Yes, you connect the mic to the power resistor R15. When you raise the value of R15 to 12 K, you can use the preamp on 12 Volts. Bertus
  7. bertus

    Sallen Key Low Pass Filter, bandpass filter

    Hello, Now you can adjust the gain of the preamp to get the wanted outout. Bertus
  8. bertus

    Sallen Key Low Pass Filter, bandpass filter

    Hello, Do something like this: Bertus
  9. bertus

    Sallen Key Low Pass Filter, bandpass filter

    Hello, Place the voltage divider between the 45 Hz source and the preamp input. Use a capacitor of about 10 uF between the voltage divider and the preamp input. As the signal peaks at 0.8 Volts, use a 1:40 voltage divider. Bertus
  10. bertus

    Sallen Key Low Pass Filter, bandpass filter

    Hello, In Audacity you have the function amplify in effects. With that you can make signals higher (+dB) and lower (-dB). You could also use a resistor divider at the 45 Hz source on the input. Bertus
  11. bertus

    Sallen Key Low Pass Filter, bandpass filter

    Hello, Keep in mind that the output of a mic can be much smaller. For the mic you probably need the gain. The output of the mic will likely be in the range of 10 - 20 mV. Read the following page for more info: https://sound-au.com/articles/mic-electret.htm Scale the 45 Hz file for lower...
  12. bertus

    Sallen Key Low Pass Filter, bandpass filter

    Hello, I am trying to setup LTspice again to have the LM in the simulation. I am using LTspice in wine on my linux PC. I seem to be missing the .sub file of the LM3914. Bertus
  13. bertus

    Sallen Key Low Pass Filter, bandpass filter

    Hello, The buffer has a high input impedance, so the detector is not loaded. The buffer output has a low impedance to drive the LM circuit. Bertus
  14. bertus

    Sallen Key Low Pass Filter, bandpass filter

    Hello, The power is fine. Bertus
  15. bertus

    Sallen Key Low Pass Filter, bandpass filter

    Hello, The load is still to heavy for the detector. Place a buffer between the detector and LM circuit: Bertus
  16. bertus

    Sallen Key Low Pass Filter, bandpass filter

    Hello, Disconnect REF from R24. Bertus
  17. bertus

    Sallen Key Low Pass Filter, bandpass filter

    Hello, The RC time is to low due to the load. Remove R25. Bertus
  18. bertus

    Sallen Key Low Pass Filter, bandpass filter

    Hello, LTspice is showing that it can not find the LM3914 on my side. Bertus
  19. bertus

    Sallen Key Low Pass Filter, bandpass filter

    Hello, Yes, I have the ZZZ collection. In wich folder is the LM3914? Bertus
  20. bertus

    Sallen Key Low Pass Filter, bandpass filter

    Hello, I see that R24 and R25 make a to heavey load on the detector. You could remove R25 from the circuit for test. Bertus
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