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Old 14th February 2004, 06:37 PM   #1
Mad_K is offline Mad_K  Norway
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Default Ultrasimple mm/mc RIAA preamp 2

This morning I threw together my own version of the "Pacific Riaa Pre". I can now say that I have a completely Single Ended feedback-free amplifier chain (Pacific+BZLS+SOZ) And a really nice sounding chain it has become.. This crude little riaa pre is too good to be true. My intention is to tweak it like nothing has been tweaked before (cascoding etc), hence the "fast & furious" building style; it's very effective though (took me about 3 hours to make). All components are matched to the tightest tolerances and to get as close as possible to the ideal riaa values which are 22K4, 3K257 + 97n6, 100R + 33n5.

Well, enough rambling; do yourself a favour and try this circuit!

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Old 14th February 2004, 06:39 PM   #2
Mad_K is offline Mad_K  Norway
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a little closer on the circuit:
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Old 14th February 2004, 06:41 PM   #3
Magura is offline Magura  Denmark
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Schematic??????

Sounds almost too good to be true...is it balanced as well???

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Old 14th February 2004, 06:41 PM   #4
Mad_K is offline Mad_K  Norway
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schematic:
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Old 14th February 2004, 06:44 PM   #5
Magura is offline Magura  Denmark
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YOu know Mads....ill make you a present in the name of the benefit of everybody here and yourself.

I have a typewriter laying around somewhere...you NEED it, so you can have it

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Old 14th February 2004, 06:47 PM   #6
Mad_K is offline Mad_K  Norway
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you're too fast Magura

I forgot to thank Thorsten; I was inspired by his "Pacific Optime" and am going to try his recommendations regarding this circuit. (Ref http://diyaudio.com/forums/showthrea...211#post252211 )
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Old 14th February 2004, 06:52 PM   #7
Magura is offline Magura  Denmark
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Quote:
Originally posted by Mad_K
you're too fast Magura


Nope....too slow, i already see your handwriting on the "back o' napkin" schematic

....and guessing didnt do me much good

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Old 14th February 2004, 06:53 PM   #8
Mad_K is offline Mad_K  Norway
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Hehe... If you can't read it, you can't build it I could have drawn it in EWB5, but I like to draw on paper. I've got a "diy journal" where I scribble all my efforts. I'm an engineer; I can't think without a pen in my hand and a piece of paper in front of me.
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Old 14th February 2004, 06:56 PM   #9
Magura is offline Magura  Denmark
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With that handwriting...you could have become a doctor of medicine

Would you mind to translate what youve written about the mosfets. Its a bit unclear to me, but lets blame it on the scanner


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Old 14th February 2004, 07:02 PM   #10
Mad_K is offline Mad_K  Norway
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Well, scanning in 150dpi and compressing it to 100KB doesn't help much

Here you go "Fets are 2SK170GR. Idss=4-6mA matched between channels per position."
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