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  1. Maglatron

    Sallen Key Low Pass Filter, bandpass filter

    the video that I'm watching is confusing me does the the rectified AC signal come after the filter to have a varying DC voltage?
  2. Maglatron

    Sallen Key Low Pass Filter, bandpass filter

    just one more quick question can I use my TL074CH for the filters, the buffer circuit and the envelope detectors?
  3. Maglatron

    Sallen Key Low Pass Filter, bandpass filter

    ok cheers
  4. Maglatron

    Sallen Key Low Pass Filter, bandpass filter

    can I use the TL074CH for this? and is C1 and C2 in microfarad (uF)
  5. Maglatron

    Sallen Key Low Pass Filter, bandpass filter

    the only thing is that the TL074H do not come in dip through hole packaging and that's not ideal for me
  6. Maglatron

    Sallen Key Low Pass Filter, bandpass filter

    I will buy the LM3915's and the TL074H's if needs be, they are cheap enough!
  7. Maglatron

    Sallen Key Low Pass Filter, bandpass filter

    can I use the peak detector schematic in conjunction with the LM3914 also can I use my TL074CN to build it? Figure 20. Precision Full-Wave Peak Detector page 13
  8. Maglatron

    Sallen Key Low Pass Filter, bandpass filter

    help please:) spice file, or schematic, circuit design, any more infomation welcomed equations, anything else other than the wiki. will it matter that I'm using LM3914 instead, in that datasheet it says, "The simplest way to display an AC signal using the LM3915 is to apply it right to pin 5...
  9. Maglatron

    Sallen Key Low Pass Filter, bandpass filter

    can't find anything on youtube about getting envelopes
  10. Maglatron

    Sallen Key Low Pass Filter, bandpass filter

    is there a tool like filterwizard
  11. Maglatron

    Sallen Key Low Pass Filter, bandpass filter

    ok so this is to make DC for the LM3914 to read, I need a little more information on how to do this but it does make sense
  12. Maglatron

    Sallen Key Low Pass Filter, bandpass filter

    I have TL074CN type, will these suffice
  13. Maglatron

    Sallen Key Low Pass Filter, bandpass filter

    or harald kapp, kellys eye, dananak, alec_t, martaine2005 all are very good
  14. Maglatron

    Sallen Key Low Pass Filter, bandpass filter

    preferably from bertus I know he spends much time helping, but his help acctually helps also want to know if I can use one of the built in op-amps of the TL074 to make the buffer circuit
  15. Maglatron

    Sallen Key Low Pass Filter, bandpass filter

    I want to know what changing the dB does I think passband Hz is how wide the passband will be around the centre frequency still not sure about stop band or what it does. Looking for clear concise explanation please
  16. Maglatron

    Sallen Key Low Pass Filter, bandpass filter

    you make no sense
  17. Maglatron

    Sallen Key Low Pass Filter, bandpass filter

    what are the differences do ie changing -3 dB to -6 dB in the pass band, changing the stopband from -40 to -10 what will be the real world effects? And what would be better for what I'm trying to do eg filter sound waves
  18. Maglatron

    Sallen Key Low Pass Filter, bandpass filter

    just to clarify and make crystal clear what are these parameters you can set in the red box
  19. Maglatron

    Sallen Key Low Pass Filter, bandpass filter

    found the answer "The gain is simply the ratio of the output voltage over the input voltage."
  20. Maglatron

    Sallen Key Low Pass Filter, bandpass filter

    in the filter tool nothing changes when I alter the gain?
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