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Old 13th April 2018, 02:45 PM   #21
Dennis Hui is online now Dennis Hui  Canada
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SIT-3
Quote:
Originally Posted by Michael Rothacher View Post
The proof of the pudding is in the eating.
I expect to get some pudding.
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Old 13th April 2018, 03:43 PM   #22
VladimirK is online now VladimirK  Uzbekistan
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Quote:
Originally Posted by Zen Mod View Post
... on inventive orientation of parallel resistors , with gold stripes on opposite ends
and considering how much drek is around , already costing more .........
anyway , be our guest , and improve it
I am not any kind of supporter of Mr Ciuffolli, I follow only my listening experience.
During perfectioning of audio system, I became less critical to many "technical nonsences". Above definite audio system level, one understands more and more, that measurement results mean less and less, and more attention is given to parts selection and "snake oil" things. This is sad, because is subjective. But, this is possibly a reason, why so many people continue their personal "gold mining".
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Old 13th April 2018, 04:55 PM   #23
BeardyWan is offline BeardyWan
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"How can you have any pudding if you don't eat yer meat?!"

Last edited by BeardyWan; 13th April 2018 at 04:58 PM.
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Old 13th April 2018, 04:57 PM   #24
BeardyWan is offline BeardyWan
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Sorry Dennis I couldn't help it.

Hi Nelson,
I have a couple of THF51S and 2sk180s - is there any guidance as to P channel mosfets that have similar thresholds that enable matching to these SITs?

many thanks
Beardy
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Old 13th April 2018, 05:06 PM   #25
plasnu is offline plasnu  United States
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GREAT NEWS!
DIY DEFSIT with Sony 2SK82/SJ28 must not be easy, though...
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Old 13th April 2018, 05:13 PM   #26
Nelson Pass is offline Nelson Pass  United States
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SIT-3
The big problem is finding a part whose enhancement mode Gate voltage
is matched to the opposite Gate voltage of the depletion mode part
at the desired current, temperature, and supply voltage.

Some of the SIT-1 transistors can be matched against some of the
P channel Mosfets of several different part numbers. For consistency,
each pair of channels uses the same devices.

After that, you have to consider whether to apply degeneration to the
Mosfets to get a consistent transconductance for the pair.

It takes a large population of parts and a lot of time.
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Old 13th April 2018, 05:51 PM   #27
vdi_nenna is offline vdi_nenna  United States
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Old 13th April 2018, 06:25 PM   #28
BeardyWan is offline BeardyWan
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Understood,

Thanks
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Old 13th April 2018, 07:31 PM   #29
Soundhappy is offline Soundhappy  France
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Commentaries please about other SIT-3 prototype ? First was with CCS I guess.
What is audio performance with optocoupler inside the circuit?
TH= one thyristor ?
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Old 13th April 2018, 08:33 PM   #30
Zen Mod is offline Zen Mod  Serbia
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TH -usual thermistor (NTC) between audio GND and chassis
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