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  1. bertus

    Sallen Key Low Pass Filter, bandpass filter

    Hello, You used a resistor of 1 mili ohms in stead of 1 mega ohms. Try the attached .asc and see what happens. Bertus
  2. bertus

    Sallen Key Low Pass Filter, bandpass filter

    Hello, Can you post the .asc file from your simulation? Also post the .wav file (rename the file to .txt before posting) Bertus
  3. bertus

    Sallen Key Low Pass Filter, bandpass filter

    Hello, What happens in the envelope? What kind of diode do you use? A shottky diode has a smaller voltage drop. Bertus
  4. bertus

    Sallen Key Low Pass Filter, bandpass filter

    Hello, Did you see post # 389? I shows the effect of the RC timing. 100 nF and 1 megohm will have a full decay of about .5 sec.( 5 x rc time) Bertus
  5. bertus

    Sallen Key Low Pass Filter, bandpass filter

    Hello, You could generate a constant tone and use the fade effect several times and speeds on that tone. You can select a part of the tone and apply the fade effect on that part. There are also several modulation plugins for audacity...
  6. bertus

    Sallen Key Low Pass Filter, bandpass filter

    Hello, In the menybar there is generate. You can create several types in there. With chirp you can create a frequency shift over time. That way you could test the behaviour of a filter. Bertus
  7. bertus

    Sallen Key Low Pass Filter, bandpass filter

    Hello, You could create some wav files in Audacity: https://en.wikipedia.org/wiki/Audacity_(audio_editor) https://www.audacityteam.org/ Bertus
  8. bertus

    Sallen Key Low Pass Filter, bandpass filter

    Hello, Here is a page with an example of a WAV file in the simulation: https://spiceman.net/ltspice-command-wave/ https://vmascagn.web.cern.ch/LABO_2020/LTspice_and_wav_files.html Bertus
  9. bertus

    Sallen Key Low Pass Filter, bandpass filter

    Hello, The following page will tell you a lot about sources in ltspice: https://spiceman.net/ltspice-voltage-current-source/ Bertus
  10. bertus

    Sallen Key Low Pass Filter, bandpass filter

    Hello, Have a look at the following picture for the effect of the RC on the shape of the envelope: The fine signal shape is the audio signal. The thick line is the created envelope. You could try 100 nF with 1 MOhm for RC and see how it behaves. Bertus
  11. bertus

    Sallen Key Low Pass Filter, bandpass filter

    Hello, That is a very complicated detector. A simple diode with a capacitor to ref might even do the trick. Bertus
  12. bertus

    Sallen Key Low Pass Filter, bandpass filter

    Hello, Most times film capacitors will have a better quality as ceramic capacitors. Bertus
  13. bertus

    Sallen Key Low Pass Filter, bandpass filter

    Hello, You can find a lot of information on capacitors on this site: http://iequalscdvdt.com/ Bertus
  14. bertus

    Maximum circuit size posting

    Hello, I think the max size is 5.120.000 All Supported Types (*.zip *.rar *.txt *.pdf *.png *.jpg *.jpeg *.jpe *.gif *.ino *.fzz *.asc *.sym *.csv) Bertus
  15. bertus

    Absolute Pressure Sensor For SPL Metering

    Hello, Have a look at fig. 8 of the following page to, on how to modify a cheap electret mic for SPL measurements: https://sound-au.com/project93.htm Bertus
  16. bertus

    Sallen Key Low Pass Filter, bandpass filter

    Hello, In stead of making a complete series of filters twice, you could add a simple amplifier between the filter and rectifier circuit: That would save you a lot of work. Bertus
  17. bertus

    Sallen Key Low Pass Filter, bandpass filter

    Hello, You could likely use the TL074 (you already have) for all filters and buffers. The TL074 might have some worse specs, but you are not going to listen to the outcome of the filters. The filtertool is likely to promote the Analog chips. Bertus
  18. bertus

    Sallen Key Low Pass Filter, bandpass filter

    Hello, Read the remarks I made on the picture in post #81. Bertus
  19. bertus

    Sallen Key Low Pass Filter, bandpass filter

    Hello, No, the topline with gain controls the volume. Leave the second line at - 3dB. Bertus
  20. bertus

    Sallen Key Low Pass Filter, bandpass filter

    Hello, You could also use a low pass for the first filter and a high pass for the last filter. All other filters can be band pass. Bertus
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