T network and supply snubber(?) revisited.

ashok · 16th January 2005, 03:11 AM

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, 10:05 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, 10:19 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, 10:32 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, 10:42 AM

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, 11:58 AM

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, 01:07 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, 01:21 PM

To Terry : I wasn't count it

, yes higher values of degeneration resistors, I see, good linearisation

.

analog_sa · 16th January 2005, 03:48 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, 07:10 AM

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

.

16th January 2005, 03:11 AM	#1
ashok diyAudio Member Join Date: Jun 2002 Location: 3RS	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. __________________ AM

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16th January 2005, 10:05 AM	#2
Franz G diyAudio Member Join Date: Jun 2004 Location: Bern / Switzerland	... 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

16th January 2005, 10:19 AM	#3
Upupa Epops diyAudio Member Join Date: Aug 2003 Location: Prague,Czech Republic	Franz, quality of this amp make something different : dual rails, good linearisation of diferential amps and high open loop gain - not snuber.

16th January 2005, 01:21 PM	#8
Upupa Epops diyAudio Member Join Date: Aug 2003 Location: Prague,Czech Republic	To Terry : I wasn't count it , yes higher values of degeneration resistors, I see, good linearisation .

17th January 2005, 07:10 AM	#10
Upupa Epops diyAudio Member Join Date: Aug 2003 Location: Prague,Czech Republic	To Terry : Look at answer of John Curl on " Electrocompaniert page " .

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