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Cartridge dynamic behaviour
Cartridge dynamic behaviour
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Old Yesterday, 09:48 PM   #1251
Hans Polak is offline Hans Polak  Netherlands
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Join Date: Mar 2005
Location: Blaricum
I'm still working on the measurement set up, but results for the AT150MLX are good enough to be translated into a replacement circuit and that's what I wanted to show already for eventual comments.

The first image below shows the replacement circuit, its FR through a 47k //150pF amp in blue and through a virt. gnd amp in green.
The latter also with an added 6usec filter in red.

The second image shows the measured data versus the simulated results.
Measured and simmed go from 360mH to 325mH, have peaks at 370mH, an Fres at 56kHz, where the modulus is 215K and a par. cap of 16pF.
The only small difference is that in the measured data the inductance rolls off slightly earlier, but for the rest everything is the same.
A bit surprisingly, the value of the part of the coil with the par. resistor comes quite precise, in this case 0.083mH.

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File Type: png AT150MLX_2.png (34.3 KB, 16 views)
File Type: png Compare2.png (166.3 KB, 16 views)
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Old Yesterday, 10:06 PM   #1252
billshurv is offline billshurv  United Kingdom
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Join Date: Mar 2014
Cartridge dynamic behaviour
It's been a long weekend so I may have missed something, but does it need as low an additional filter as you have added there? In current mode it looks pretty flat up to CD4 frequencies.

Really interesting measurement. Thank you again for sharing.
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