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  1. Maglatron

    Sallen Key Low Pass Filter, bandpass filter

    for the 9 volt at the beggining I will use a voltage divider Vout = Vin x (R2/R1+R2) pick R1 to be 10k 9V = 12V x (R2/10k+R2) solve for R2 = (9V x 10k/12V-9V) R2 = 90k/3V R2 approximatly 30k!
  2. Maglatron

    Sallen Key Low Pass Filter, bandpass filter

    I got this far in the chain just need little nudge in the right direction
  3. Maglatron

    Sallen Key Low Pass Filter, bandpass filter

    anyone?? please!?
  4. Maglatron

    Sallen Key Low Pass Filter, bandpass filter

    It's like if I know how it's supposed to look and know why it works that way, then I can understand it, but trying to figure it out on my own is like putting together a puzzle without a picture on it! so please provide me with the images I need, cheers
  5. Maglatron

    Sallen Key Low Pass Filter, bandpass filter

    please can you draw the schematic so I can work it out looking at the correct configuration because I don't understand, I'm lost, I need an image of the circuit running off a 12v source please please please can you do a design of the cascaded bar type LM3914 with the REF virtual ground from the...
  6. Maglatron

    Sallen Key Low Pass Filter, bandpass filter

    I get why the REF virtual ground is put to the Rlo, it's because 6v is the lowest instead of 0v and the upper limit is between 6v and 12v I just don't know how to set it up
  7. Maglatron

    Sallen Key Low Pass Filter, bandpass filter

    I've got the part in green but have to get it connected to the LM3914! (green part)
  8. Maglatron

    Sallen Key Low Pass Filter, bandpass filter

    Is it correct?? I think it looks good to go! if not can you modify the diagram to express how it should look please?
  9. Maglatron

    Sallen Key Low Pass Filter, bandpass filter

    I think this
  10. Maglatron

    Sallen Key Low Pass Filter, bandpass filter

    I'm just going to leave it at 12v or put a variable resistor 10k
  11. Maglatron

    Sallen Key Low Pass Filter, bandpass filter

    how do I set Rhi please?
  12. Maglatron

    Sallen Key Low Pass Filter, bandpass filter

    bertus, I feel you understand the problem a little better, can you shed any more light on this matter please? if im supplying Rlo with the reference ground from the the buffer circuit, how do I set the Rhi value to say, 9V? cheers
  13. Maglatron

    Sallen Key Low Pass Filter, bandpass filter

    I think you missed a bit, I am going to be connecting the Rlo to the REF virtual ground of the buffer wich is 6V, and the -V will be connected to ground, Rhi should be between this REF voltage (6V) and +12V so I choose (9V), how do you wire it??
  14. Maglatron

    Sallen Key Low Pass Filter, bandpass filter

    I've read the stuff on LM3914 how would I hook this up if I connected the pin 4 Rlo to REF of the buffer circuit how would I set the Rhi to be inbetween the REF and +12v
  15. Maglatron

    Sallen Key Low Pass Filter, bandpass filter

    I don't understand what you just said but thanks for the link mr prime I want to know how do you make the voltage on Rhi between REF and +12V, resistors?? I will read the entire article and if I still don't understand I'll check back looks like good info, cheers
  16. Maglatron

    Sallen Key Low Pass Filter, bandpass filter

    This tells me yes! I think still wondering...
  17. Maglatron

    Sallen Key Low Pass Filter, bandpass filter

    just to clafify at this point is the REF virtual voltage 6volts
  18. Maglatron

    Sallen Key Low Pass Filter, bandpass filter

    I'm looking at the datasheet, and it says to connect Rhi to pin 7 of the LM3914 how do you make The Rhi be a value between Ref and +12 Volts.?
  19. Maglatron

    Sallen Key Low Pass Filter, bandpass filter

    how do you make it between REF and +12V, resistors??
  20. Maglatron

    Sallen Key Low Pass Filter, bandpass filter

    could you draw on to the image above how to wire it if you can? cheers
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