Phono cartridge noise calculator
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 2nd January 2012, 11:00 PM #1 SY   On Hiatus     Join Date: Oct 2002 Location: Chicagoland Phono cartridge noise calculator I've posted a little Excel-based calculator for intrinsic phono cartridge noise, both flat and with RIAA equalization weighting. Input cartridge nominal output voltage, DCR and inductance, then preamp load resistance and capacitance. The noise voltages assume a unity gain ideal (noiseless) preamp- this sets the noise floor so you can determine what an acceptable preamp noise is for your cartridge. It also allows you to compare the intrinsic S/N of different cartridges. SYclotron Audio RIAA Noise Calculator __________________ "You tell me whar a man gits his corn pone, en I'll tell you what his 'pinions is."
 2nd January 2012, 11:06 PM #2 Joachim Gerhard   diyAudio Member     Join Date: Mar 2009 That is pretty cool. Thank you, this is very useful.
 2nd January 2012, 11:39 PM #3 SY   On Hiatus     Join Date: Oct 2002 Location: Chicagoland I'm surprised others haven't done it before. As I was putting together my MM phono stage and reading about the stunningly low noise of some other preamps, I wondered, "What do I really need? Is there a reason to increase complexity and heat to get an extra 6dB in the preamp?" It should be pretty easy to add a noise figure function as well. I'll do that at some point... __________________ "You tell me whar a man gits his corn pone, en I'll tell you what his 'pinions is."
 2nd January 2012, 11:51 PM #4 Joachim Gerhard   diyAudio Member     Join Date: Mar 2009 Douglas Self has done that mathematically but not as convenient as this one. The best MC stages i can make have -80dB. My Titan i is 81.5dB after your program, so what is the noise figure ? 4.5dB ?
 2nd January 2012, 11:57 PM #5 SY   On Hiatus     Join Date: Oct 2002 Location: Chicagoland I was thinking of preamp noise figure. So with the en and in known, NF should come flopping right out from the calculated complex source Z. I think your NF is 1.5dB assuming the same weighting and no noise current. __________________ "You tell me whar a man gits his corn pone, en I'll tell you what his 'pinions is."
 3rd January 2012, 12:01 AM #6 Joachim Gerhard   diyAudio Member     Join Date: Mar 2009 Should the noise of the cartridge and the preamp not add ? Sure, noise figure is 1,5dB because the preamp is 1,5dB worse. Am i right ?
 3rd January 2012, 12:06 AM #7 Joachim Gerhard   diyAudio Member     Join Date: Mar 2009 The values i used was : Loading : 470 Ohm Cartridge DC impedance : 6 Ohm Cartridge Inductance : 0.0005mH Cartridge Output : 0.5mV
 3rd January 2012, 12:11 AM #8 Salas   diyAudio Chief Moderator     Join Date: Oct 2002 Location: Athens-Greece Handy calc, it sadly lacks the SYclotron logo and the underscore motto though.
 3rd January 2012, 01:06 AM #9 grufti   diyAudio Member     Join Date: Jun 2004 Location: Hillside I had noticed the intrinsic phono cartridge noise calculation result in your article for HMV here at diyaudio and I thought to myself at the time how tedious it must have been to come up with that number slice by slice. Nothing quite like Excel to simplify the task. Thank you, very worthwhile.
SY
On Hiatus

Join Date: Oct 2002
Location: Chicagoland
Quote:
 Originally Posted by Joachim Gerhard Should the noise of the cartridge and the preamp not add ? Sure, noise figure is 1,5dB because the preamp is 1,5dB worse. Am i right ?
Well, first, how was your preamp s/n determined? Shorted input? Or have you measured en and in separately?
__________________
"You tell me whar a man gits his corn pone, en I'll tell you what his 'pinions is."

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