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  1. Maglatron

    Sallen Key Low Pass Filter, bandpass filter

    I missed something the preamp power supply was not connected to the top rail so I fixed that, it's a better result spread more evenly! still not outputting on the filters though, should I amplifiy it less and use thee amplifier circuit, I'm going to try that
  2. Maglatron

    Sallen Key Low Pass Filter, bandpass filter

    so that didn't work but the pre-amp works perfectly!! so that is progress!! the filter just stays at a flatline at 6v the filter is for 45Hz and it's a 45Hz signal so it should pass by rights
  3. Maglatron

    Sallen Key Low Pass Filter, bandpass filter

    So heres the first filter but I don't think its working properly, I think I have to amplify the signal first! at the moment it flat lines at 6v so part of it works properly!
  4. Maglatron

    Sallen Key Low Pass Filter, bandpass filter

    what type of capacitors do I use for the buffer, I think for the 100nf the film caps that I have will do but what about the 10uF's? I'm ordering parts!
  5. Maglatron

    Sallen Key Low Pass Filter, bandpass filter

    32 years young, and you?
  6. Maglatron

    Sallen Key Low Pass Filter, bandpass filter

    Hello I think I misunderstood the pre-amp needs to amplify the signal to 0.9 vpp and then need an amplifier to amplify to 2.25v vpk (0.45 x 5) why not just use the preamp to make it output the 2.25v vpk
  7. Maglatron

    Sallen Key Low Pass Filter, bandpass filter

    Hello how do you measure for vpp?
  8. Maglatron

    Sallen Key Low Pass Filter, bandpass filter

    cool
  9. Maglatron

    Sallen Key Low Pass Filter, bandpass filter

    commercial as in consumer?
  10. Maglatron

    Sallen Key Low Pass Filter, bandpass filter

    ok its been a productive day I will be doing research into how to get the commertial line level will this preamp that you supplied a while back will it do the job
  11. Maglatron

    Sallen Key Low Pass Filter, bandpass filter

    so you mentioned that what comes from the pre-amp that will be and gets amplified to then go on to the filters to then pass the signal on to the envelope detector to go on to the lm3914's you said that the gain of 5 would translate to 2.25v, I'm not seeing something! maybe between the preamp...
  12. Maglatron

    Sallen Key Low Pass Filter, bandpass filter

    sorry got mixed up I said how do you set the 0v I meant the negative pin I didn't know what you call it of the op-amp but you answered it strait away with "the VCC- can get a ground symbol"
  13. Maglatron

    Sallen Key Low Pass Filter, bandpass filter

    like so, correct so far???
  14. Maglatron

    Sallen Key Low Pass Filter, bandpass filter

    thought as much but it's always best to check and so back to the novice question what type of caps do I use in the buffer circuit
  15. Maglatron

    Sallen Key Low Pass Filter, bandpass filter

    oh yes I remember now and how do you set it to 0v again?
  16. Maglatron

    Sallen Key Low Pass Filter, bandpass filter

  17. Maglatron

    Sallen Key Low Pass Filter, bandpass filter

    If this +goes to REF where does the negative go to?
  18. Maglatron

    Sallen Key Low Pass Filter, bandpass filter

    when the original signal is 31.4millivolts and times by 4 only gives 0.1256, and you said that the range is from 0 to 2.4v, 0.1256 is only 5.23% of 2.4 am I missing something here?
  19. Maglatron

    Sallen Key Low Pass Filter, bandpass filter

    In spice, I want to create a point on the buffer called ref, and connect the refs of the filters to it without wires also the same with the 12v power supply I did it before but forgotten how!
  20. Maglatron

    Sallen Key Low Pass Filter, bandpass filter

    and what is mixing line signal, left and right??
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