http://www.beis.de/Forum Forum www.Beis.de - Last posts Forum www.Beis.de Forum@Beis.de de http://www.beis.de/Forum/thema.php?board=1&thema=11&page=last#2 Re: Phono stage + ADC

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Nice artikel about RIAA correction can be downloaded from www.breem.nl
this is the link part 1 and part 2;
http://ip565bfb2a.direct-adsl.nl/article...resonance-1.pdf
http://ip565bfb2a.direct-adsl.nl/article...resonance-2.pdf

But it is in Dutch!

I build this design in the early '80's

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from Henk]]> Tue, 09 Jun 2009 11:17:58 +0200 http://www.beis.de/Forum/thema.php?board=5&thema=6&page=last#0 Chips in DACs

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Does anyone have a cross reference of commercial DACs versus the chip set used? I am looking into designing a new Mac Mini look-alike amplifier and have found a lot of chips proposed, either Input->SP/DIF to I2S->Analog->Class D amp, or the same but I2S->PWM->Direct Class D (ie no analog part).

www.cottage-audio.co.uk

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from syganymede]]> Wed, 20 May 2009 22:00:59 +0200 http://www.beis.de/Forum/thema.php?board=6&thema=4&page=last#13 Re: Anyone interested in my DIY ADC designs?

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Hi kipman,

Looks interesting - I tried to upload the simulation file but was not successful in so doing. Many ads but no file.....? Can you possibly mail it to moensted@image.dk?

Best regards,

Jesper

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from gentlevoice]]> Sun, 19 Apr 2009 19:44:46 +0200 http://www.beis.de/Forum/thema.php?board=6&thema=4&page=last#12 Re: Anyone interested in my DIY ADC designs?

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Hello I got an email telling me that the picture links no longer worked so I am reuploading some pics, I am not sure if they are the same as before as I can't seem to find any working 2nd order schematic yet I have a working one on a breadboard.

As for designing a high quality modulator I don't think it's feasable to build such a circuit and I lack the knowlage to build proper modulators as I need to learn about Z transforms to even understand the text books. Although I was fiddling with implimenting a delta sigma modulator digitaly on an FPGA for usage in a switching amplifier such that there are no analog amplification stages.

Project the modulator was used in:


First Order Modulator:
I like this circuit as it works and only needs 3IC's yet provides good enough quality to record speach at 500KHz sample rate.


some waveforms showing input signal (red) and output signal (green):


here are some simetrix simulation files for playing with, simetrix is a free download:
http://sharebee.com/c64919a3

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from kipman725]]> Fri, 17 Apr 2009 01:49:07 +0200 http://www.beis.de/Forum/thema.php?board=6&thema=5&page=last#0 from ]]> Thu, 01 Jan 1970 01:00:00 +0100