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
That was very well explained. You have a gift for this!
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!
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.
Keep the videos coming! Love these!
a great teacher with great videos thanks man
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.
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.
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
GOOD PRESENTATION.
that was quite informative, thanks!
It would be nice if you would do an active- bootsrapped-Twin-T Notch filter example with Q calculation
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
Love your 3M Breadboard! Is that vintage or new-ish?
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.
@@TheOffsetVolt I have an A.C.E. 236 and a Heathkit ET-1000 breadboard and handsdown are better made than the new stuff!
what is the advantage of a twin t notch filter over other types of notch filters?
I thought that this circuit with the opamp generate sine 🤦♂️