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Old 18th February 2008, 03:51 PM   #381
Zen Mod is offline Zen Mod  Serbia
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Quote:
Originally posted by paulb
I started to look through the 64 pages of this thread. Has anybody noticed the noise to signal ratio is pretty high?
............

well - if you look who are most frequent posters in this thread , and look for other threads where are the same most frequent posters , you'll find that these threads have same S/N ratio ............

if you think on S/N ratio of thread , not preamp's ........

(it's nice to have fun and pleasure looking at schematics , but there is some life left out of schematics world)

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Old 18th February 2008, 03:55 PM   #382
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Mmm, does post 9 of the 1st page not link to the PCB selling thread ?

I can see that dviswa may have a noise issue if he's heading for unity gain, but just where did you read the SNR number ?
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Old 18th February 2008, 04:25 PM   #383
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Quote:
Originally posted by jacco vermeulen
Mmm, does post 9 of the 1st page not link to the PCB selling thread ?

I can see that dviswa may have a noise issue if he's heading for unity gain, but just where did you read the SNR number ?
Jacco,

S/N of the thread aside, which we all know is a ZM thread, doomed to OT
Please explain what you meant regarding SNR vis-a-vis unity gain.

Thanks,
Dinesh
 
Old 18th February 2008, 04:33 PM   #384
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Quote:
Originally posted by dviswa


Jacco,

S/N of the thread aside, which we all know is a ZM thread, doomed to OT
Please explain what you meant regarding SNR vis-a-vis unity gain.

Thanks,
Dinesh

Jaccovitty is just playin' , as always ........

you can use that drek in unity gain ....... just rearrange (J)accordingly values of those phase lag caps in feedback net ........ observing what CRO can show you ......
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Old 18th February 2008, 05:10 PM   #385
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True,
at unity gain your SNR will improve by roughly 24dB, but on the other hand there's not much volume coming out either.
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Old 19th February 2008, 03:15 PM   #386
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I wan't to report a very very amazing case of telepathy between Crunchville and Vienna


Quote:
Originally posted by mpmarino
...
Shunty is beautifully ugly - she will find a home in a phono pre or a small amp - or both, and surely will do a 'terrible' job at it . ...

As marino posted these lines, at the very same time, I was asking our Master Zen :

Quote:
Originally posted elsewhere by Manu
... while waiting for some caps for pumpkin, I decided to finish my ONO, I began 5 years ago... May be they will Kuscheln in same case, who knows...
BTW : Would be Shunty a good reg. for ONO ?
He replayed almost immediately :

Quote:
Originally posted elsewhere by ZenMod
... it's completelly possible to feed it with Shunty , but be prepared to double dissipation - read - double heatsinking.......
maybe smartest thing is to relocate all mosfets and darlingtons to external heatsink ...
Isn't great?

Is it unity gain?


Manu
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Old 19th February 2008, 04:15 PM   #387
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Quote:
Originally posted by jacco vermeulen
I thought the ONO runs on 30Vdc ?

btw:
Newark still has 2 transformers suitable for the Shut-up in stock, Hammond 167G80.
80VCT/0.5A, split bobbin jobbies, not exactamundo cheap at $31/pc, but pretty.

Hammond sheet
You thought right : +/- 30VDC

Very nice trannies indeed.

Manu
 
Old 20th February 2008, 12:51 PM   #388
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Quote:
Originally posted by mpmarino
You don't like vinyl, Choky? I thought you was a tubehead?

Seeing that you are awake, I have a pumpkin building question

pumpkin on +- 25v ?? Willit work OK?

suggested parts modifications if necessary?

I dunno if I will drive an F4 but for a couple reasons it wound be convenient to lower the voltage (I'm sure you can guess at least one).

- though I'm sure it will still drive F4 fine even at less volts - if it can work.

(Has lower voltage already been discussed?? If so- sorry, I've been stickin my nose in here once per day or so lately- to poke .....wiked busy )

me not like vinyl ...... HA!!!

it will work on +/-24 , why not ....... even without slight modification ..... if I'm not nutz completely right now ....

just toss 2 of these accus on each side , ya cheapskate!
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Old 21st February 2008, 07:29 AM   #389
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Quote:
Originally posted by hershann
Sorry to interrupt all the intelligent discussions - and adding noise to the nice signal all of you have been generating.

Doing some calculations:
So if corner freq, F = 1/(2 x pi x R x C)
(where R = R1 X R2 / R1+R2, and R1=shunt resistor of output and R2 = input impedance of F4)
And if I use 3.3uF for C4, C5.

R = 100k x 47k / (147k) = 31973

therefore F = 1.51Hz?
So give a factor of 10 where it starts to fall off the curve - so my calculations shows that it is good for 15Hz?

Correct?

her shann



just shoot for it , besides-you can always place nice little Wima as bypass for output caps ...... ya know these little red thingies ..... 2u2/63V

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Old 21st February 2008, 12:23 PM   #390
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Quote:
Originally posted by Zen Mod





just shoot for it , besides-you can always place nice little Wima as bypass for output caps ...... ya know these little red thingies ..... 2u2/63V


But, but, but those little red thingies have already been soldered in and they are really tiny at u47/250V


her shann
 

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