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Old 16th January 2005, 03:11 AM   #1
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Default 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.
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Old 16th January 2005, 10:05 AM   #2
Franz G is offline Franz G  Switzerland
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... 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
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Old 16th January 2005, 10:19 AM   #3
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Franz, quality of this amp make something different : dual rails, good linearisation of diferential amps and high open loop gain - not snuber.
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Old 16th January 2005, 10:32 AM   #4
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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
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Old 16th January 2005, 10:42 AM   #5
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Default 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
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Old 16th January 2005, 11:58 AM   #6
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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.
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Old 16th January 2005, 01:07 PM   #7
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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
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Old 16th January 2005, 01:21 PM   #8
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To Terry : I wasn't count it , yes higher values of degeneration resistors, I see, good linearisation .
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Old 16th January 2005, 03:48 PM   #9
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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.
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Old 17th January 2005, 07:10 AM   #10
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To Terry : Look at answer of John Curl on " Electrocompaniert page " .
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