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Old 6th October 2012, 10:45 PM   #1241
Harry3 is offline Harry3  Australia
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Wow -thanks - now I get it! I was totally confused.
I will look at using the MJL1302A & MJL3281A as output transistors. This will be my project for Christmas.
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Old 7th October 2012, 12:00 AM   #1242
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Merry Christmas.
L.C. has a very special way to design his schematics and it does not always help to understand them.
But do not ask-him to change, i suppose it is part of his original way to feel electronic, and part of his talent, looking from a different angle, to get innovative ideas.
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Old 7th October 2012, 12:31 AM   #1243
AKSA is offline AKSA  Australia
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Christophe,

I agee the LC complementary output systema is elegant. However, hasn't been Bryston for using this approach for many decades?

Hugh
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Old 7th October 2012, 01:42 AM   #1244
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Quote:
Originally Posted by AKSA View Post
However, hasn't been Bryston for using this approach for many decades?
Yes, Hugh, you're perfectly right.
I'm very impressed by your electronic culture (Not the first time :-)
On the Bryston's schematics i'v found, they use a BJT to drive the output devices. Not so elegant because the Base -> emitter current. Did they use FET to drive the power transistors in one of their amp ?
That was new for me. (But i'm so far to know everything ;-)

Well, my thought about this architecture (the parts in my schematic) was:
As that can be adapted to BJTs as well as FETs output devices, we can imagine one unique board with all the previous stages, and the choice between two boards for the power units: one with BJT, an other with Lateral MOSFETs. An unique occasion to see if any difference in the way they sound ?
What do-you think ?
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Old 7th October 2012, 03:40 AM   #1245
AKSA is offline AKSA  Australia
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Bonjour Christophe,

Thank you for your reply.

I have carefully listened to this configuration - not measured rather, but critically listened only - and found an impression of harshness. You could expect this however since any distortion of mixed npn/pnp on each side would add additional on each half cycle, which in turn shows odd harmonics.

OTOH if you adopt npn and pnp asymmetrical for the outputs, viz the usually approach for most amps, you have undifferentiation transconductance, which indicate pushes towards to even distortions, most H2.

You have to choose whether you prefer very low distortion of H3/H5 or highish distortion of H2/H4. That depends which presentation you prefer look like, and you might even ask if the very odd harmonics are audible regardless the very vanishingly THD.

Your choose your poison.......

Ciao,

Hugh
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Old 7th October 2012, 07:02 AM   #1246
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So here are start step, i soldered parts LC indicate me. These parts form the 3 CCS.
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Old 7th October 2012, 07:05 AM   #1247
Salas is offline Salas  Greece
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Pink LEDs?????
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Old 7th October 2012, 07:10 AM   #1248
mikelm is offline mikelm  England
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I think if the film caps were green they would look like green LEDs
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Old 7th October 2012, 07:16 AM   #1249
Salas is offline Salas  Greece
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Thought of that but even the front ones and at an angle. Look at the small one back to the right near enough to the blue trimmer still clear. They are choosing Wima to absorb for some reason. Maybe the white background promotes the red more when the light splashes.
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Old 7th October 2012, 08:20 AM   #1250
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Quote:
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Pink LEDs?????
No, they Infra Red Led. The package is a little bit pink.

Marc
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