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Old 25th December 2012, 11:13 PM   #161
sonnya is offline sonnya  Denmark
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And Sanyos are part of ONSEMI.

Try these.

Product Search Results

They do not has quite as low millercapacitance but all other parameters looks good.
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Old 26th December 2012, 01:51 AM   #162
Bonsai is offline Bonsai  Taiwan
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Quote:
Originally Posted by Joachim Gerhard View Post
I think Fairchild makes substitutes for the Sanyos.
Yes. This what I am using on my amps for TIS devices

PNP = KSA1381
NPN = KSC3503
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Old 26th December 2012, 02:13 AM   #163
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KSA1538 and KSC3953 are easily obtainable and just as good.
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Old 26th December 2012, 03:17 AM   #164
tinitus is offline tinitus  Europe
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Quote:
Originally Posted by Bonsai View Post
Yes. This what I am using on my amps for TIS devices

PNP = KSA1381
NPN = KSC3503
those I can get easy from Mouser and even though they come from outside EU, I know they are in my mailbox within a few days
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Old 26th December 2012, 04:26 AM   #165
joshvi is offline joshvi  India
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Hi LC,

Very nice ,simple,easy to build design.I like it

The closed loop gain depend up on different feedback path for upper and lower half cycles.So these feed back resistors are very close in values.Better to use matched one or use 0.1% tolerence .Even 1% variation make 4% gain difference (in worst case)and become assymetrical in each half cycles.

Best regards

joshvi
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Old 26th December 2012, 05:52 AM   #166
sonnya is offline sonnya  Denmark
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Quote:
Originally Posted by tinitus View Post
those I can get easy from Mouser and even though they come from outside EU, I know they are in my mailbox within a few days
The ones from mouser are two different gain ranges.

I also have them, but mine are in the same range.
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Old 26th December 2012, 07:56 AM   #167
tinitus is offline tinitus  Europe
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Quote:
Originally Posted by sonnya View Post
.... two different gain ranges.
ahh, you mean the SA(PNP) is hfe1-E grade, and SC(NPN) is D-grade

couldn't find it before bit I see it now, hfe D-grade 60-120 dc gain, E-grade 100-200

thanks!
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Old 26th December 2012, 08:04 AM   #168
wahab is offline wahab  Algeria
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Quote:
Originally Posted by joshvi View Post

The closed loop gain depend up on different feedback path for upper and lower half cycles.So these feed back resistors are very close in values.Better to use matched one or use 0.1% tolerence .Even 1% variation make 4% gain difference (in worst case)and become assymetrical in each half cycles.
You nailed it....

That s the main problem with separate FB return since 1% mismatch
in the two FB resistors can increase distorsion by 10dB.
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Old 26th December 2012, 08:34 AM   #169
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Quote:
Originally Posted by wahab View Post
You nailed it....

That s the main problem with separate FB return since 1% mismatch
in the two FB resistors can increase distorsion by 10dB.
That's why I measured all feedback resistors (also all other parts crucial for OLG, CLG) in my SSA, CSA, VSSA, to 4th decimal matching with my Fluke ... one of the reasons I bought Fluke in the first place.
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Last edited by Lazy Cat; 26th December 2012 at 08:53 AM.
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Old 26th December 2012, 08:41 AM   #170
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Quote:
Originally Posted by Salas View Post
Where 50uV and 2V derive from?
supply ripple in AC signal ground (10uF||2,2mF) ratio to feedback voltage
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