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Old 29th January 2009, 06:40 PM   #771
atiq19 is offline atiq19  United Kingdom
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Jkeny,

Sorry I mis-spelt your nick.

Here is the concept for Technics class A+.

Atiq
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Old 29th January 2009, 07:26 PM   #772
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Quote:
Steve -When you do your sims on the non switching output stages do you also do a stepped DC input
I do step the input waveform to simulate various levels
(.01, .1, 1, 1.77v) and different frequencies (100, 1k, 10k)
to see if the circuit "holds true". just recently I started using
(2, 4 ,8 ,16R) with capacitance.. to simulate any load
expected.
I will try stepping pure dc, it might help in stabilizing the sourcing
of the class A operation.

Quote:
Byatiq19 - Here is the concept for Technics class A+.
I think the "new class a" does what amp 1 AND 2 do, but
with 1 Op stage...
OS
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Old 29th January 2009, 07:40 PM   #773
jkeny is offline jkeny  Ireland
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No problem atiq, I saw that conceptual schematic with the floating PS on the output - these guys can't even get their head around that concept Could someone explain this Hafler/Strickland output topology to me?
The whole thread is wasted discussing what floating PS is
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Old 29th January 2009, 07:41 PM   #774
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Does anyone have schematic of jvc super A, this might also be interesting.
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Old 29th January 2009, 11:27 PM   #775
atiq19 is offline atiq19  United Kingdom
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I have managed so look JVC AX-9 service manual. I don't think this is an elegant solution compared to Technics. I suspect it was probably a marketing hype in 80s. Who would waste 560W idle power for 100W heater?

It would be interesting to see OS realisation of Technics' technique in Frugal amp.

Still, if needed send me pm. File too big (5mb) to attach.

Cheers
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Old 29th January 2009, 11:38 PM   #776
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Quote:
I have managed so look JVC AX-9 service manual. I don't think this is an elegant solution compared to Technics
UPload to my "WWW"...

http://71.203.210.93/upload/~upload
anything else you want to upload ..go ahead..
OS
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Old 29th January 2009, 11:43 PM   #777
atiq19 is offline atiq19  United Kingdom
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other decent solution for dynamic biasing amp can be found using LT1166 bias chip (without pin 2).

In the risk of thread hijacking I would concentrate on OS frugal amp from now on.
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Old 29th January 2009, 11:46 PM   #778
jkeny is offline jkeny  Ireland
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I think there are posts here about a design flaw in the LT1166 chip - affects the sonics

edit: But I don't know how big n issue - could be worth trying?
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Old 29th January 2009, 11:47 PM   #779
atiq19 is offline atiq19  United Kingdom
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uploaded:

JVC Ax-9 manual
Technics AES paper
Technics paper from Australian Hi-fi magazine
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Old 29th January 2009, 11:52 PM   #780
atiq19 is offline atiq19  United Kingdom
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Default lt1166

jkeny,

http://www.diyaudio.com/forums/showt...92#post1478092

http://www.diyaudio.com/forums/showt...11#post1107211

read between the lines.

Cheers

Atiq
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