69. Twin T Notch Filter

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  • čas přidán 21. 08. 2024
  • This is an elaboration (improvement?) on video 68. Band Stop Filters (link below). I didn't discuss Twin-T filters as well as I should have so I decided this addendum was needed. We talk about how the lower and upper critical frequencies (-3dB points) are determined as well as finding the geometric center of this very wide band device. A course of bread boarded circuits follow.
    68. Band Stop Filters
    • 68. Band-Stop Filters
  • Věda a technologie

Komentáře • 17

  • @TrystansWorkbench
    @TrystansWorkbench Před 6 lety +1

    That was very well explained. You have a gift for this!

  • @wilbamate
    @wilbamate Před 5 lety

    So I came to learn about filters in hope of cutting out feedback from my car engine (which I can hear through my Bluetooth to fm transmitter being plugged into 12v socket). Obviously out of my depth.. But man, that was fascinating. Very impressive knowledge, thanks for uploading!

  • @edmondedwards6729
    @edmondedwards6729 Před 4 lety

    thanks for the posting...I needed a 188 khz notch filter and found that 36pf / 72pf caps, along with 8.2K / 22K resistors work well in the twin tee circuit.

  • @simplyflipflops
    @simplyflipflops Před 6 lety +1

    Keep the videos coming! Love these!

  • @alibehrouz9833
    @alibehrouz9833 Před 6 lety

    a great teacher with great videos thanks man

  • @byronwatkins2565
    @byronwatkins2565 Před 3 lety

    Ceramics can vary by factors of 10 with temperature -- temperature dependent frequencies are usually not what we want in filters. They also are piezoelectric and couple to vibrations. A large part of the twin-T's rejection comes from the phase retardation in the low-pass path opposing the phase advancement in the high-pass path. At the notch frequency, current tends to oscillate around the loop (like a tank circuit) instead of flowing into the load.

    • @TheOffsetVolt
      @TheOffsetVolt  Před 3 lety

      That's very true, they can be devilish that way. I try to avoid ceramics in any critical circuit but at the same time, try to make component selection simple for those online. I should have put a note in the video.

  • @sgsound12
    @sgsound12 Před rokem

    Some guitar player here?? With a twin T notch as feedback in the operational and a potenciometer instead the resistor to ground you cant get ...a WAH WAH circuit!.I did it in the 70's

  • @davidluther3408
    @davidluther3408 Před 4 lety

    GOOD PRESENTATION.

  • @paulg.3067
    @paulg.3067 Před 6 lety

    that was quite informative, thanks!

  • @paulg.3067
    @paulg.3067 Před 5 lety

    It would be nice if you would do an active- bootsrapped-Twin-T Notch filter example with Q calculation

  • @massinissaautoscan
    @massinissaautoscan Před 7 měsíci

    dear sir
    please how to get quasi sine wave (inductive crankshaft signal for automobile) from square wave i.e crankshaft signal (hall effect) varing from 0 to +5 VOLT using for exemple a low pass filter
    note: the frequency range is : 800HZ TO 30KHZ
    THANKS SIR

  • @SouthShoreSonics
    @SouthShoreSonics Před 3 lety

    Love your 3M Breadboard! Is that vintage or new-ish?

    • @TheOffsetVolt
      @TheOffsetVolt  Před 3 lety +1

      Hi Mark, As I get older I find that what some call old is newish to me ;) This one's about 10 or 15 years old now.

    • @SouthShoreSonics
      @SouthShoreSonics Před 3 lety

      @@TheOffsetVolt I have an A.C.E. 236 and a Heathkit ET-1000 breadboard and handsdown are better made than the new stuff!

  • @Master_jedi_1
    @Master_jedi_1 Před 4 lety

    what is the advantage of a twin t notch filter over other types of notch filters?

  • @ajingolk7716
    @ajingolk7716 Před 2 měsíci

    I thought that this circuit with the opamp generate sine 🤦‍♂️