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  1. bertus

    Sallen Key Low Pass Filter, bandpass filter

    Hello, I seem not to have the LM3914 for the simulation. Bertus
  2. bertus

    Sallen Key Low Pass Filter, bandpass filter

    Hello, What has changed since the last simulation? Bertus
  3. bertus

    Sallen Key Low Pass Filter, bandpass filter

    Hello, Yes, You could change the amplifier to have a max output of 8.4 Volts. Bertus
  4. bertus

    Sallen Key Low Pass Filter, bandpass filter

    Hello, The LM3914 circuit shows values between 6 and 8.4 Volts. Bertus
  5. bertus

    Sallen Key Low Pass Filter, bandpass filter

    Hello, To much signal gets lost in the capacitors C15 and C17 at 45 Hz. Increase the value to 10 uF and see the result. Bertus
  6. bertus

    Sallen Key Low Pass Filter, bandpass filter

    Hello, Yes, insert the amplifier between the preamp and filter. Use an other cap at the output of the amplifier. Bertus
  7. bertus

    Sallen Key Low Pass Filter, bandpass filter

    Hello, Remove the shorts accross R3, R8 and R11 Bertus
  8. bertus

    Sallen Key Low Pass Filter, bandpass filter

    Hello, Sorry, yes, a consumer level of 0.9 Vpp. The given schematic can set the gain with the 100k potmeter between 1 and 21 times for the mic. Bertus
  9. bertus

    Sallen Key Low Pass Filter, bandpass filter

    Hello, It depends a bit on what level is coming from the preamp. Try to get it in the range of the comercial line level, according the wiki page. Bertus
  10. bertus

    Comedy Thread

    It is an old joke from elektor. The output is shorted and the resistor is very high.
  11. bertus

    Comedy Thread

  12. bertus

    Comedy Thread

    Voltage regulator for 0 Volts output.
  13. bertus

    Sallen Key Low Pass Filter, bandpass filter

    Hello, and how do you set it to 0v again? : audio is a positive and negative going signal. What do you mean with set it to 0V? The VCC- can get a ground simbol. Bertus
  14. bertus

    Sallen Key Low Pass Filter, bandpass filter

    Hello, Line level for consumer audio is about 0.9 Vpp: https://en.wikipedia.org/wiki/Line_level With a gain of 5 the peak would be about 0.45 X 5 = 2.25 Volts. The VCC+ is 12 Volts, VCC- is 0 Volts. REF would be 6 Volts. Bertus
  15. bertus

    Comedy Thread

  16. bertus

    Comedy Thread

  17. bertus

    Comedy Thread

  18. bertus

    Sallen Key Low Pass Filter, bandpass filter

    Hello, The TL072 is the dual version of the TL074. I have an alternate setup for your spectrum display. In stead of making 16 amplifiers between the filter and detectors, you could make one amplifier in front of all 16 filters: Bertus
  19. bertus

    Sallen Key Low Pass Filter, bandpass filter

    Hello, When you use a factor of 1.4 between the frequencies, you get the following range: 45 63 88 123 173 242 339 474 664 930 1302 1822 2551 3572 5000 7000 Bertus
  20. bertus

    Sallen Key Low Pass Filter, bandpass filter

    Hello, Yes, the amplifier goes between the filter and detector. Bertus
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