I think just as informative as the bode plot, would be to get a function generator to sweep a sine wave from 200hz to 2khz over 10 seconds and listen to the output on a speaker.
It looks okay. It'd be nice to hear it on a receiver. Many years ago I bought a c.w. audio filter kit from Maplin for my h/b radio. It' works pretty well. G4GHB.
While we one the subject of frequnecy... I was looking through your vidoe library , looking for detail on your rubidium stanrdard, but did not see anything on how it was built. Would love see an upated video and how one might be built today. BTW big fan of your channel.
No, haven't done one. It is based on the Fe-5680A Rubidium. added a large heatsink. also have a distribution amp to supply the 10MHz to various instruments. th-cam.com/video/cV01ceuiknM/w-d-xo.htmlsi=bupRJ269GSUlZv-4
So by my squinting this is a lumped bandpass made of three second-order lowpass filters, and a single second-order high-pass. The angles on the bode plot at least, match that speculation.
Would it be feasible to make it parametric with adjustable center frequency and bandwidth? Possible, yes, but could it reasonably be modified without a bunch of trouble? Looking at the schematic @6:38, it seems the op amps are all unity gain inverters -outputs shorted to inverting input, and the first three of of them are high-pass and the final op-amp at lower right is high-pass?? Is it practical to to make the low-pass and high-pass adjustment variable? I have a feeling that my understanding of this circuit is prolly incorrect. Could u give us the skinny on how this thing works?
Not for this design I don't think, it has a bunch of resistors with different values tuned as different filters to add up to a nice band pass, not only 1 or 2.
@@ivolol I figure it would require some dual or more gang potentiometers, or a switchable bank of bank of preset pots. But that's prolly more trouble than it is worth.
The modern way to do this would be to use a very fast Arduino. Some have fast ADC and DAC systems on the chip and run at clock speeds of 600MHz. Then one could make a tunable filter with just two extra potentiometers.
Maysuremints! :-). Thank you for doing this. I just ordered this, and I'm going to be building it this week.
I'm gonna need a "let's get this onto a tray...nice" at least once
I think just as informative as the bode plot, would be to get a function generator to sweep a sine wave from 200hz to 2khz over 10 seconds and listen to the output on a speaker.
I completely agree, and we could even hear it in sync with the Bode plot... that's exactly how a Bode plot is taken.
Yeah, I was hoping for that.
Maybe he will see these comments and do just that for us.
Haha
It's the same filter Hans Summers uses in the QCX mini and plus. Very nice. Tnx for your video.
73
I've build HI-PER-MITE and used it in a project of mine. Nice filter indeed.
It looks okay. It'd be nice to hear it on a receiver.
Many years ago I bought a c.w. audio filter kit from Maplin for my h/b radio. It' works pretty well.
G4GHB.
While we one the subject of frequnecy... I was looking through your vidoe library , looking for detail on your rubidium stanrdard, but did not see anything on how it was built. Would love see an upated video and how one might be built today. BTW big fan of your channel.
No, haven't done one. It is based on the Fe-5680A Rubidium. added a large heatsink. also have a distribution amp to supply the 10MHz to various instruments. th-cam.com/video/cV01ceuiknM/w-d-xo.htmlsi=bupRJ269GSUlZv-4
So by my squinting this is a lumped bandpass made of three second-order lowpass filters, and a single second-order high-pass. The angles on the bode plot at least, match that speculation.
I had to squint also, and that's what I came up with. Hail, fellow squinter!
captain commando rare hightech wave gun
What happens if you put white noise through it?
Would it be feasible to make it parametric with adjustable center frequency and bandwidth? Possible, yes, but could it reasonably be modified without a bunch of trouble? Looking at the schematic @6:38, it seems the op amps are all unity gain inverters -outputs shorted to inverting input, and the first three of of them are high-pass and the final op-amp at lower right is high-pass?? Is it practical to to make the low-pass and high-pass adjustment variable? I have a feeling that my understanding of this circuit is prolly incorrect. Could u give us the skinny on how this thing works?
Not for this design I don't think, it has a bunch of resistors with different values tuned as different filters to add up to a nice band pass, not only 1 or 2.
@@ivolol I figure it would require some dual or more gang potentiometers, or a switchable bank of bank of preset pots. But that's prolly more trouble than it is worth.
No story time. 😢
Sockets and chips. Is that anything like fish and chips?
More silicon, less mercury.
The modern way to do this would be to use a very fast Arduino. Some have fast ADC and DAC systems on the chip and run at clock speeds of 600MHz. Then one could make a tunable filter with just two extra potentiometers.
if microcontroller, then you could just detect the carrier, and replace it with a pure 700Hz tone. haven't seen that yet
@@IMSAIGuy yes. Do a real time FFT and home in on the signal you want then just output a synthesized tone that replicates the signal.