Help me with this bandpass filter!!

Discussion in 'The Projects Forum' started by zero_coke, Nov 30, 2011.

  1. zero_coke

    Thread Starter Active Member

    Apr 22, 2009
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    What do I need to do to make this to work? I mean, in Multisim it works perfectly but when I actually built the filter with the exact capacitance values and resistor values it didn't even work nearly as I expected. I was expecting 12kHz bandwidth and I'm getting half that, 6kHz. What could possibly be the difference between simulation and the actual circuit? Am I missing something that the simulation software automatically takes care of??
     
  2. Audioguru

    New Member

    Dec 20, 2007
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    You forgot to post the schematic of your bandpass filter and tell us its orders so we can't analyse it.
     
  3. zero_coke

    Thread Starter Active Member

    Apr 22, 2009
    294
    1
    Oh I'm sorry. I realized today that the capacitors I bought from Sayal are garbage! The label says 241 (which is supposed to be 240pF) but I measured it and its 1nF. No wonder it wasn't working...Now it works perfectly.
     
  4. Audioguru

    New Member

    Dec 20, 2007
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    I bought name-brand ICs at Sayal. They were brand new and cost half as much as at other places and worked perfectly.
    I bought some name-brand surplus power supplies that were excellent.
    But their LEDs are garbage.

    I have never bought capacitors there.
     
  5. zero_coke

    Thread Starter Active Member

    Apr 22, 2009
    294
    1
    Yeah I had to because it was the only place I know (besides Active surplus but that's more of a electronics thrift store) to buy components from. I should've just ordered stuff from newark or digikey.
     
  6. Audioguru

    New Member

    Dec 20, 2007
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    896
    Active Electronics still has one store in the Toronto area. It is in Scarborough beside Electrosonic and Sayal's head office store.

    I used to shop at Active Electronics frequently when they had more stores.
     
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