Just go for it. You KNOW you can do it!!!
Converting the AD797 MC Phono Pre to a MM Phono Pre - A Mixed Design.
- Thread starter USMC Spike
- Start date
C2, C1 and Cr0R3 as close tolerance as you can get and try to match ch-ch.
All Rs 1%. Otherwise, as in the AD797MCPRE.
Thank you
Is there a chicken emoji anywhere?Thank you
More lazy than afraid
USMC Spike
Well-Known Member
..."getting to know you...."
A brain dump would be much faster and more efficient,
but that is still a ways off.
Wyn, while you are here...
...Why when I changed the value of the small resistor in the
feedback path made no difference in the output from yesterdays post.
Then I'm off again to buy the wife's cars.
The stealerships do this to me.
because I don't
and accept their fees, add on, etc.
I looking for an
but I get these
my jaw
they're words
you said you would treat me
but you treat me
I say, Hasta La Vista....arsch loch.
So as our Native Home Boy sings LINK
The post wouldn't be complete with out my kids favorite
emoticon....
USMC_Spike
Post Script - When the dust settles, and I bring home
the wife's new vehicle and see her smile, I'll work the sin again.
A brain dump would be much faster and more efficient,
but that is still a ways off.
Wyn, while you are here...
...Why when I changed the value of the small resistor in the
feedback path made no difference in the output from yesterdays post.
Then I'm off again to buy the wife's cars.
The stealerships do this to me.
because I don't
and accept their fees, add on, etc.
I looking for an
but I get these
my jaw
they're words
you said you would treat me
but you treat me
I say, Hasta La Vista....arsch loch.
So as our Native Home Boy sings LINK
The post wouldn't be complete with out my kids favorite
emoticon....
USMC_Spike
Post Script - When the dust settles, and I bring home
the wife's new vehicle and see her smile, I'll work the sin again.
Last edited:
USMC Spike
Well-Known Member
Good. But, as a general rule, you don't need to worry about noise outside the audio band- except that it's good to simulate it to check to see if there are any pathological issues that could be exposed by it. Sometimes resonances and other issues are apparent looking at the noise and are less so when looking at the frequency response- for instance a near oscillating current mirror or current source would not necessarily appear in the frequency response but would appear in the noise.
USMC Spike
Well-Known Member
woops, not yet. Where do I enter to make it a 5.5 VRMS normialized input?
The other sim, let me find it and put it below here. I've got about 30mins I think.
The other sim, let me find it and put it below here. I've got about 30mins I think.
Which small resistor in which simulation? Sometimes you just have to look closely enough. If we're looking for responses within a few 10s of mdB sometimes you need to zoom in...."getting to know you...."
A brain dump would be much faster and more efficient,
but that is still a ways off.
Wyn, while you are here...
...Why when I changed the value of the small resistor in the
feedback path made no difference in the output from yesterdays post.
Then I'm off again to buy the wife's cars.
The stealerships do this to me.
because I don't
and accept their fees, add on, etc.
I looking for an
but I get these
my jaw
they're words
you said you would treat me
but you treat me
I say, Hasta La Vista....arsch loch.
So as our Native Home Boy sings LINK
The post wouldn't be complete with out my kids favorite
emoticon....
USMC_Spike
Post Script - When the dust settles, and I bring home
the wife's new vehicle and see her smile, I'll work the sin again.
Remember the ac sim does not care about the amplitude of the input- except that it simplifies the interpretation if you normalize the input to the desired input level so that you get the desired output level.
The 5.5mv rms refers to the AC scaled input (c. -45dBv) which is the input of the preamp you asked for. For this preamp the noise and gain is lower than for the one intended for a 2.5mv rms sensitivity.
So, in one case (your request) 5.5mv rms @1kHz produces 1v rms at the output, and in the "new" case 2.5mv rms produces the same 1v rms.
USMC Spike
Well-Known Member
Here is where I am I only see V(outmixed1) I cannot find the V(onoise) either in schematic or the plot.
I went back to the original mixedriaanew schematic and plot.
USMC Spike
Well-Known Member
Then If I want to do a sine sweep, do I just input a 1Vrms @1kHz ?
Then how do I add the Aweighting to it. That might be the second paragraph
or the last paragraph but haven't worked my way down to that yet.
Then how do I add the Aweighting to it. That might be the second paragraph
or the last paragraph but haven't worked my way down to that yet.
If you look at your noise plot you will see that it's labelled v(onoise). Remember, the frequency response and noise simulations are different animals.
Are you talking about a transient analysis? There is a way to do a chirp in transient- is that what you're asking?
If so, there are changes that need to be made and I don't have time to walk you through it, and I'm not sure why you would wish to do that when all you have are behavioral models for the opamps etc. and not device level models.
Follow the instructions in the earlier post. It's still the same noise simulation that doesn't care about the input level, but with the network added after the amp output.
V(onoise) does NOT refer to a circuit node. It refers to the output noise (onoise) voltage. It's measured at the node you specified in the simulation command.
USMC Spike
Well-Known Member
I think I got it correctly operating now:
Yes, however have you managed to insert the A weighting network?
USMC Spike
Well-Known Member
No, not yet. I'll have to figure that out. I'll go back and see if I can't figure
out how to insert the Aweighting network.
Great, first LTSpice XVII wants to update itself including all 6,000 + files.
Son of More Joy.
out how to insert the Aweighting network.
Great, first LTSpice XVII wants to update itself including all 6,000 + files.
Son of More Joy.
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