Unusual amp from 1987

stanislav1957 · 2021-01-11 2:06 am

I returned to the scheme of the modernized Kletsov. Simple, very stable and effective.

minek123 · 2021-01-11 2:58 am

What about your previous version from post #935 ?
https://www.diyaudio.com/forums/solid-state/357369-unusual-amp-1987-a-94.html#post6451615

Modernized Kletsov is any better?
LTP right after op-amp seems to be redundant and avoidable...
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А как насчет вашей предыдущей версии из поста №935?
Модернизированный Клецов чем-нибудь лучше? LTP сразу после операционного усилителя кажется излишним, и его можно избежать ...

minek123 · 2021-01-11 2:59 am

What is the role of Q3?

stanislav1957 · 2021-01-11 3:02 am

The idea came ,I put it together. It turned out very well.Kg is also minimal.And according to that scheme, everything is not bad either.Yes they are all at the level of noise distortion

stanislav1957 · 2021-01-11 3:05 am

minek123 said:
What is the role of Q3?

Current generator. The source of current . Normal switching on of the differential amplifier .

stanislav1957 · 2021-01-11 3:13 am

Figured it out . You don't need to delete Q3. So linear. And without it, nothing will work.Scheme for brain training.

minek123 · 2021-01-11 3:42 am

minek123 · 2021-01-11 3:45 am

Well, I have PCBs coming on Wednesday for the version from post #935 (one of my later posts with hexfets - complementary and quasi).
So that's what I will build for now...

stanislav1957 · 2021-01-11 3:47 am

It's good.And we have frosts, not up to hobbies.
Is there a dictionary of terms on the forum?

minek123 · 2021-01-11 3:50 am

Also, I'll be building Philips 22AH578 amp from post #792.
https://www.diyaudio.com/forums/solid-state/357369-unusual-amp-1987-a-80.html#post6433425

Also have PCBs for it...
Very simple, fast, only 2 small transistors, 2 TO-126, and dual-die latfets.
Newest sim attached.

So I have 3 amps lined up to build, and one older (current dump passive from Elvee) still waiting for some testing/tuning..

minek123 · 2021-01-11 3:54 am

>Is there a dictionary of terms on the forum?
Don't think so. But these terms are relatively standard.
E.g. Russian OOS => NFB

stanislav1957 · 2021-01-11 3:54 am

Well, this is certainly a much simpler amplifier. And there are fewer details.

minek123 · 2021-01-11 3:57 am

It's not as good as the latest versions of amps here in this thread,
I wanted to try one that's faster, and symmetrical. Let's see how it sounds...

stanislav1957 · 2021-01-11 3:58 am

You can't always guess. LTP for example. local oos or something ? Or a limiter clip limiter ?

minek123 · 2021-01-11 4:01 am

>Is there a dictionary of terms on the forum?
The best way would be to get English version of Douglas Self's book ("Audio Power Amplifier Design"), and in the INDEX, at the end, there is very comprehensive list of terms/abbreviations/acronyms, so you can easily find their meaning (in English).

minek123 · 2021-01-11 4:02 am

LTP - long tailed pair
Transistor Long Tailed Pair >> Electronics Notes
This terminology is well explained in the book.

minek123 · 2021-01-11 4:06 am

I got used to Russian acronyms, such as OOS, but most of people here don't bother to remember...
Or Cascade => Stage

stanislav1957 · 2021-01-11 4:13 am

Understood. differential amplifier.But he's DC current ensures the stabilization of the modes .The output of the opamp is zero DC voltage .

minek123 · 2021-01-11 10:11 pm

Maxim, are you sure the LTP is needed?
This schematic seems to do exactly the same...
Same Thd, and profile as with your LTP + CCS.

Unusual amp from 1987

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