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mgjsmith 6th December 2010 11:05 PM

Transfer LP TO CD
 
I am considering the construction of a "simple" phono preamp to connect my old Ariston RD40 turntable with MC cartridge to my pc to enable the transfer of some old lp recordings. Can anyone offer some guidance on suitable circuits solid state or tube. Martin

mickeymoose 8th December 2010 04:13 PM

nch.com offers a Vinyl to CD software package with a30 day free trial. Check it out. E

richie00boy 8th December 2010 04:55 PM

Are you sure it's an MC cartridge not MM?

I would avoid software RIAA correction as the dynamic range is poor.

MrSlim 8th December 2010 10:07 PM

The Hagerman Bugle: Hagerman Technology LLC: Bugle Opamp Moving Magnet Budget Phonostage DIY Kit is well regarded. I've built one, and it's what I am planning on using to do my LP to digital conversion.

Even these: Phonopreamps.com Home Page are pretty decent from what I have read..

MrSlim 8th December 2010 10:12 PM

Check out this thread..
http://www.diyaudio.com/forums/analo...reamp-2-a.html

planet10 8th December 2010 10:20 PM

Quote:

Originally Posted by richie00boy (Post 2391449)
I would avoid software RIAA correction as the dynamic range is poor.

There is an AES paper by the guy from Channel D that may have you rethinking that. I will be trying his solution soon in conjunction with an Edirol FA66

dave

Calvin 9th December 2010 08:59 AM

Hi,

richie00boy is correct. Software equalizing costs on dynamic range.
Each Bit represents app. 6dB of dynamic range. The RIAA-curvature spans roughly a 40dB range between 20Hz and 20kHz, So one has to spare 7bits for the equing alone. Add to this a headroom of 1 to 2 bits to avoid clipping and you end up with at least 8 to 9 Bits of the ADCīs resolution. In case of a 20Bit ADC this means that just 11-12 bits are left free, representing a marginal dynamic range of just 66-72dB.
This dynamic range is only applicable in the case that the ADC is supplied with just the right voltage levels for itīs reference voltage and signal input voltage. Since most ADCīs reference voltage settle between 3.3V and 5V the phono-cartridge signal requires linear amplification, or the reference voltage needs to be lowered to match the cartridges output voltage. The latter costs resolution because of noise issues. The former would be the preferrably solution, but if You need amplification anyway, whatīs the sense then in not to use hardware equing at the same and omitting with software equing alltogether?
IMHO using a fine phono-stage with linear output, driving an ADC with healthy levels of voltage is still the finest solution.

jauu
Calvin

planet10 9th December 2010 10:00 AM

Read the paper, He does a MUCH more thorough analysis of the pluses & minuses. It is, IB, downloadable from his site,

CHANNEL D - Professional and Audiophile Quality Software for Vinyl, iTunes, and commercial applications

Here it is... the 2 papers at the bottom of the Pure Vinyl section.

dave


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