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Old 16th December 2012, 11:04 AM   #41
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Quote:
Originally Posted by sonnya View Post
2sc3503 and 2sa1381 is full body plastic
Yes I know, thanks to your delivery.

I should wrote if any other types of VAS transistors like BD139/140 are used, than mica insulators are mandatory.
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Old 16th December 2012, 03:09 PM   #42
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Hi LC,

To switch to 16A output devices, is swap from 2SC3503/2SA1381 to BD139/BD149 sufficient?

Marc
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Old 16th December 2012, 03:21 PM   #43
lineup is offline lineup  Sweden
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Here is HALF the VSSA. It is almost like FETZILLA.
Half the VSSA works well, too.
A little bit more THD(0.007% at 1 Watt), but it behaves well even at higher power output.

For those who want to experiment with really simple power amplifier:
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Old 16th December 2012, 03:23 PM   #44
wahab is offline wahab  Algeria
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Quote:
Originally Posted by Lazy Cat View Post
Similar schematics posted a lot of times but not exactly the same.
Tell us the differences with the "similar schematics" so we can
understand where are the innovations....



Quote:
Originally Posted by Bigun View Post
This looks like Gaborbela's '20yr' design to me ?
That s the same circuit but with a mosfet output stage instead
of the darlingtons....
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Old 16th December 2012, 05:25 PM   #45
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Quote:
Originally Posted by wahab View Post
Tell us the differences with the "similar schematics" so we can
understand where are the innovations....
Innovations, who said anything about that? Do you see my statement incorrect or offensive in any way? Why should I tell you anything? BTW if you don't like it here, just skip forward please.
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Old 16th December 2012, 05:30 PM   #46
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Quote:
Originally Posted by lineup View Post
For those who want to experiment with really simple power amplifier:
OK for few parts more you get VSSA symmetrical amp with, as you've already said, better performance.

I make symmetrical amps only, that's my choice and I will stick to it in the future.
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Old 16th December 2012, 06:14 PM   #47
wahab is offline wahab  Algeria
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Quote:
Originally Posted by Lazy Cat View Post
Do you see my statement incorrect
The following statement is not true :

Quote:
Originally Posted by Lazy Cat View Post
Similar schematics posted a lot of times but not exactly the same.
This amp is a copy cat of Gabor s old amp , so just give credit
where it is due rather than talking of "non similarities" that are
just hollow words since you d be hard pressed if asked to find a single difference.
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Old 16th December 2012, 06:59 PM   #48
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Quote:
Originally Posted by Idefixes View Post
Hi LC,

To switch to 16A output devices, is swap from 2SC3503/2SA1381 to BD139/BD149 sufficient?

Marc
VAS BJT's are more like hFE, fT and Vce max parameters importance, since collector current is only 15mA and power dissipation around 0,5W. So any high performance NPN/PNP complemenary pair in TO-126 case is just fine here.
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Old 16th December 2012, 07:03 PM   #49
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If Alex won't find time to make one of his probably the most compact PCB here, than I will go for it. Lets make some smokin' VSSA as a
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Old 16th December 2012, 07:26 PM   #50
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Hi LC i playing at this time with eagle...
First for TO3 as ia had layout for TO3 Lateral SSA. Will show you as it been ended. After it's easy to swap to plastic case.

Marc
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