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Old 30th January 2009, 12:01 AM   #781
atiq19 is offline atiq19  United Kingdom
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Default lt1166

Trouble with LT1166 begings when u use pin2, transconductance stage of the chip. Behaves nastily in HF region.

Also note that compensation needs to be symmetric rather than one sided from the driver stage.

If you are not really after instrumentation level of performance (o-ish thd), then this 2$ chip can be handy.

For simulation use SYN08 model.
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Old 30th January 2009, 12:04 AM   #782
jkeny is offline jkeny  Ireland
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Hmm seems worthwhile - what do you think Os?
Atiq have you some experience in using the chip?
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Old 30th January 2009, 12:07 AM   #783
atiq19 is offline atiq19  United Kingdom
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I'm afraid I didn't try this chip.

But you can ask SYN08. He even reverse engineered the chip.
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Old 30th January 2009, 12:15 AM   #784
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thanks...
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Old 30th January 2009, 12:31 AM   #785
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Quote:
atiq - other decent solution for dynamic biasing amp can be found using LT1166 bias chip (without pin 2).
looks like the LT1166 is part of a typical boosted bias circuit
with the wave shaper inside (maybe), anyone have the
datasheet??

Driven by a lm4702c ( a future frugalamp)none the less..

Don't worry about offtopic , I am scraping ALL knowledge up
for this one. Op-amp designs.... obscure IC's , I'll steal any good
idea. The only issue with actually using a IC is , with my luck,
I'll build a amp I really like and they will discontinue the IC.

(I do like the 4702c a LOT)

thank you ,atiq the JVC A-X9 is super a in a totally discreet
form .
Os
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Old 30th January 2009, 01:10 AM   #786
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I dont think its that amp then, its a non switching AB and that sounds more like a class a amp. I found this on a chinese site though, the pick says its a audiotek from 1978, and I kinda like this scheme, the current mirrors is the way to go but I still have to figure out exactly how this implementation works.
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Old 30th January 2009, 01:18 AM   #787
andy_c is offline andy_c  United States
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Have y'all read the AES article by Tanaka (from Sansui) about non-switching class B? It's called New Biasing Circuit for Class B Operation from 1981.

I have a copy if anyone's interested.
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Old 30th January 2009, 01:21 AM   #788
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This one shows it better, isnt this the jvc scheme
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Old 30th January 2009, 01:31 AM   #789
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Quote:
dont think its that amp then, its a non switching AB and that sounds more like a class a amp. I found this on a chinese site though, the pick says its a audiotek from 1978, and I kinda like this scheme, the current mirrors is the way to go but I still have to figure out exactly how this implementation works.
That is close to the JVC , it is using the cm's as the wave shaper
(same as the resistors and diodes in passive version) I was already heading
in this direction in my sims using the diamond to feedback
the class a "bias stop"...

Q5 and 6 can be left out if you are only using a Standard
Type 2 EF as they are only acting as 2 more Vbe's in
the circuit... the huang 4 ..what a name..
QUOTE]Homemodder - This one shows it better, isnt this the jvc scheme[/QUOTE]
thats the JVC...drawn better than the sevice manual..

OS
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Old 30th January 2009, 01:41 AM   #790
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Quote:
By andy - Have y'all read the AES article by Tanaka (from Sansui) about non-switching class B? It's called New Biasing Circuit for Class B Operation from 1981.
Hello, Andy... Yes, the more technical info the better.. I'm finding
clues around every corner...

I owned a super- A JVC in the 80's and its sound at high volumes
was astounding.. so this is a personal quest for me..

Upload where you did before... (thank you for HQ self/smithkoen
papers BTW)
http://71.203.210.93/upload/~upload
OS
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