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Phono cartridge self resonance
Phono cartridge self resonance
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Old 1st February 2019, 08:32 PM   #71
Hans Polak is online now Hans Polak  Netherlands
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There's nothing in the patent that helps us further.
It's in the same category as the Aurak with the virtual gnd input.


Hans
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Old 1st February 2019, 08:43 PM   #72
billshurv is offline billshurv  United Kingdom
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Phono cartridge self resonance
Nothing that hasn't been rediscovered no, but still interesting to note that this idea has been seriously considered 30+ years ago.
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Old 1st February 2019, 09:46 PM   #73
Dilbert is offline Dilbert  Canada
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Nothing that hasn't been rediscovered no, but still interesting to note that this idea has been seriously considered 30+ years ago.
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Old 1st February 2019, 11:22 PM   #74
Dilbert is offline Dilbert  Canada
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There's nothing in the patent that helps us further.
It's in the same category as the Aurak with the virtual gnd input.


Hans
Hey Hans, I only shared as an FYI. With all due respect, I bet you’re really fun at a party.
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Old 1st February 2019, 11:33 PM   #75
billshurv is offline billshurv  United Kingdom
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Phono cartridge self resonance
Actually I'm the one who's no fun at parties!


I will say that, for me, for whom these things are not always obvious seeing how he got the 50Hz pole was interesting. Same topology, two approaches. But there is something that feels right about getting the pole there and needing less correction downstream. I can't tell what is lost this way over the 2L-R approach without thinking about it.
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Old 2nd February 2019, 01:40 AM   #76
scott wurcer is offline scott wurcer  United States
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I'm not sure anyone knows*! We never got many hints of inband cantilever resonances when we went looking for them other than the most Clydesdale** of cantilevers.
Maybe so, if one simulates the three loadings, 100pF||47k, open circuit, short circuit the coil currents are orders of magnitude different. Should this not show up some how in the magnitude of eddy current effects?
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Old 2nd February 2019, 12:26 PM   #77
scott wurcer is offline scott wurcer  United States
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I mis-spoke a little yesterday, what I meant was that the midrange dip has a 1-3dB per decade slope which is (small) fractional f and I don't see modeling it except with some broad distributed time constant mechanism. So I didn't mean cantilever resonance per se but something else mechanical possibly.

EDIT - I might be in the wrong thread.
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Old 2nd February 2019, 01:06 PM   #78
Bonsai is offline Bonsai  Europe
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I've had another bash at this. I've 'modelled' the mechanical resonance with V2 which gives deep dip at 30 kHz - obviously this can be moved around within reason with the judicious adjustment of parasitic L and C.

I can only get a significant resonant peak at ~20 kHz if I increase the cart load from 47k to 100-200k which hardly representative of reality. More work needed.

R3 and C2 crudely model the RIAA corner f at 2120Hz.

I need to find a way to sum to two curves. Anyway, my 2 cents worth.

Keantoken, where are you?
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Old 2nd February 2019, 01:38 PM   #79
Bonsai is offline Bonsai  Europe
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Here it is with the plots summed
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Old 2nd February 2019, 03:23 PM   #80
luckythedog is offline luckythedog  United Kingdom
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Originally Posted by scott wurcer View Post
I mis-spoke a little yesterday, what I meant was that the midrange dip has a 1-3dB per decade slope which is (small) fractional f and I don't see modeling it except with some broad distributed time constant mechanism. So I didn't mean cantilever resonance per se but something else mechanical possibly.

EDIT - I might be in the wrong thread.
Yup, it's still a mind melt to work out which thread applies

Bending mechanics and wave propagation theory yields equations in fractional powers in fourths.

Here's a plot from a while back on calculated cantilever impedance as seen from the pointy end which sort of has an interesting and familiar profile. Only certain modes of cantilever bending resonance are permissible without mistracking.

Cantilevers bend!

LD
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