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  1. bertus

    Sallen Key Low Pass Filter, bandpass filter

    Hello, Here is a simple one that has gain control: You can also use one part of the TL074 for it. Bertus
  2. bertus

    Sallen Key Low Pass Filter, bandpass filter

    Hello, The way you arranged the frequencies is just fine. Bertus
  3. bertus

    Sallen Key Low Pass Filter, bandpass filter

    Hello, The LM chips will be on every frequency channel to show the volume on that channel. Bertus
  4. bertus

    Sallen Key Low Pass Filter, bandpass filter

    Hello, The LM3915 shows 3 dB steps. With each step twice the volume is shown. Bertus
  5. bertus

    Sallen Key Low Pass Filter, bandpass filter

    Hello, I see that you made the stopband more narrow. That will lead to an extra stage in the filters. I also see you are mentioning the LM3914, wich is a linear voltage indicator. The LM3915 would be more suitable for audio as it is logaritmic. Bertus
  6. bertus

    Sallen Key Low Pass Filter, bandpass filter

  7. bertus

    Sallen Key Low Pass Filter, bandpass filter

    Hello, Yes, you can still use the tool. Perhaps change the optimalisation to "voltage range". This will lower the resistor values a bit. Bertus
  8. bertus

    free movies and documentairies at nasa+

    hello, i just found this: https://plus.nasa.gov/ bertus
  9. bertus

    Sallen Key Low Pass Filter, bandpass filter

    hello, have a look here: https://www.epanorama.net/circuits/micamp.html bertus
  10. bertus

    Sallen Key Low Pass Filter, bandpass filter

    Hello, If you want quad opamps in DIL housing, have a look at the TL074 or TL084. Bertus
  11. bertus

    Sallen Key Low Pass Filter, bandpass filter

    Hello, All those numbers don't tell me much. Do you have links to the datasheets? What do you intend to do with those chips? Bertus
  12. bertus

    Sallen Key Low Pass Filter, bandpass filter

    Hello, The 32 Hz filter will pass only signals in the range of 32 Hz. The intensity (volume) is passed through the filter. Low volume will give a low output, High volume will give a high output. Bertus
  13. bertus

    Sallen Key Low Pass Filter, bandpass filter

    Hello, The edges I am talking about are the frequency changes. Bertus
  14. bertus

    Sallen Key Low Pass Filter, bandpass filter

    Hello, When broadening the passband, you will need sharper edges, wich leads to more filter stages. When narrowing the stopband, you will also need sharper edges and also more filter stages. Just play with the numbers in the tool and see what happens. The number of stages is given in the left...
  15. bertus

    Sallen Key Low Pass Filter, bandpass filter

    Hello, Making the passband wider will lead to more stages for filtering. Making the stopband smaller will also lead to more stages for filtering. Bertus
  16. bertus

    Sallen Key Low Pass Filter, bandpass filter

    Hello, Yes, the stopband is the width at the bottom of the graph. Bertus
  17. bertus

    Sallen Key Low Pass Filter, bandpass filter

    Hello, ca. is about. Bertus
  18. bertus

    Sallen Key Low Pass Filter, bandpass filter

  19. bertus

    7486 IC problem

    Hello, Wich version of the 7486 is used? In the table I posted you can find the working voltages. Bertus
  20. bertus

    Sallen Key Low Pass Filter, bandpass filter

    Hello, It is not in DIP format. It is a form of SMD chip. Bertus
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