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-   -   T network and supply snubber(?) revisited. (http://www.diyaudio.com/forums/chip-amps/49680-t-network-supply-snubber-revisited.html)

ashok 16th January 2005 04:11 AM

T network and supply snubber(?) revisited.
 
I was looking at M.Otala's amplifier circuit diagram and found that he has used the T network in the feedback loop and also used the RC (snubber?) on the supply rails , both being discussed on this forum. So I guess if it's on the Electrocompaniet amp it must be useful .
Suggest that others look at the circuit at
http://home.online.no/~tsandstr/Otal...20original.htm

Cheers.

Franz G 16th January 2005 11:05 AM

... very interesting!

And with the hand drawing, it looks like we have a double-t! It is not exactly clear, what the horizontal resistor is, what value? Connected to the feedback path?

And the snubbers, indeed! 0.68uF and 1R :)

Franz

Upupa Epops 16th January 2005 11:19 AM

Franz, quality of this amp make something different : dual rails, good linearisation of diferential amps and high open loop gain ;) - not snuber.

analog_sa 16th January 2005 11:32 AM

Quote:

So I guess if it's on the Electrocompaniet amp it must be useful .


The more current EC amps use neither so i guess it's not so useful :)

ThorstenL 16th January 2005 11:42 AM

Re: T network and supply snubber(?) revisited.
 
Konnichiwa,

Quote:

Originally posted by ashok
I was looking at M.Otala's amplifier circuit diagram and found that he has used the T network in the feedback loop and also used the RC (snubber?) on the supply rails
Yup. He also uses inverting mode!

Very interesting historical headsup.

Sayonara

ashok 16th January 2005 12:58 PM

Quote:

The more current EC amps use neither so i guess it's not so useful
The new designer (?) can probably achieve the same acoustic performance without them . That doesn't mean that it never was good ! Just that he is using some other methods to achieve it - probably with less component count (?).
Would you have any idea ? Can you share the circuit diagram of the newer circuits so that we can make an informed guess ?
Thanks.
Ashok.

Terry Demol 16th January 2005 02:07 PM

Quote:

Originally posted by Upupa Epops
Franz, quality of this amp make something different : dual rails, good linearisation of diferential amps and high open loop gain ;) - not snuber.
This amp has low open loop gain. Each stage is degenerated.
The FB value is listed as 20dB... not large by any standards.


Cheers,

Terry

Upupa Epops 16th January 2005 02:21 PM

To Terry : I wasn't count it ;) , yes higher values of degeneration resistors, I see, good linearisation ;) .

analog_sa 16th January 2005 04:48 PM

Quote:

The new designer (?) can probably achieve the same acoustic performance without them . That doesn't mean that it never was good ! Just that he is using some other methods to achieve it - probably with less component count (?).

Sorry, Ashok, i was just joking. The snubbers, t-network and inverting mode are all good features in my book. The circuits (or links) of AW70,100,120 were posted on this forum. If you can't find them send me a pvt mail and i'll be pleased to email them.

Upupa Epops 17th January 2005 08:10 AM

To Terry : Look at answer of John Curl on " Electrocompaniert page " ;) .


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