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21st March 2010, 12:30 PM
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#1 |
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diyAudio Member
Join Date: May 2008
Location: On a mushroom
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trying a solid state RIAA
I was idle this morning looking at converging several ideas to attept to come up with a precision RIAA stage - duinno if anyone else has mucked about with RIAA before? - I'd prefer to remove the op amps and have an all transistor stage.
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Hum likes to have a nice "Noise to Signal" ratio  To "Hum" is to be noticed  Quality hum is when it pours out of Electrostatic speakers
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21st March 2010, 12:39 PM
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#2 |
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diyAudio Member
Join Date: Aug 2006
Location: Taipei, Taiwan
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Have done a noise sim on this circuit? I think it will be quite noisey.
Q9 to Q12 and the associated resistors all add noise. Sor SOTA see Syn08's stuff in the analog front end forum - you should get some good ideas. If you are looking for a basic mag input RIAA, I'd suggest an op-amp based design. |
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21st March 2010, 01:06 PM
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#3 | |
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diyAudio Member
Join Date: May 2005
Location: Californication
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Quote:
Op amps like L1037 are low noise optimized for mag inputs while LT1028 for MC's. Depending on topology you can even run them class A with buffers.
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like four million tons of hydrogen exploding on the sun like the whisper of the termites building castles in the dust |
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21st March 2010, 03:15 PM
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#5 | |
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diyAudio Member
Join Date: May 2008
Location: On a mushroom
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Quote:
You're right of course, but you obviously havent read my sig It's not bad at the moment - 2mV signal in to 550mV out - noise of course will be a function of gain also and there is the performance of those two op-amps anyway, with all of that gain in there it doesnt have much choice but to have some noise - I am just doing this as an idle exercise for fun. I'd like to know if it is possible that the better transistors made today could actually offer more design choices? Yeah I was just idling trying to figure out how a discrete transistor only RIAA with the proper corrections would look - getting the envelope shape right is a challenge.
__________________
Hum likes to have a nice "Noise to Signal" ratio To "Hum" is to be noticed Quality hum is when it pours out of Electrostatic speakers
Last edited by PhaseLockLoopy; 21st March 2010 at 03:18 PM. |
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21st March 2010, 03:41 PM
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#6 |
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diyAudio Member
Join Date: Aug 2006
Location: Taipei, Taiwan
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. . . you should go with infinia's advice on this one.
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21st March 2010, 03:58 PM
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#8 | |
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diyAudio Member
Join Date: Aug 2002
Location: Sofia
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Quote:
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21st March 2010, 05:21 PM
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#9 | |
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diyAudio Member
Join Date: Nov 2009
Location: Los Angeles
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Quote:
G² |
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