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Old 10th November 2003, 08:22 AM   #11
rbroer is offline rbroer  Netherlands
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Quote:
Originally posted by jean-paul
Mmm, could it be that the integrator cap is missing in the schematic ?
Correct, too much hassle to route it, I just solder it on the bottom side between pin 2 and 6 of the opamp.


Quote:
Originally posted by zygibajt
Great thing.
Is it intended for non-os or os TDA1541 mode?
Also ,any substitute for 2SC2547?
I had a very hard time finding them for some other project some time ago.
Bartek
The I/V doesn't care about oversampling or not...
2SC2240 should do just fine


Quote:
Originally posted by Peter Daniel
I got some BC547 and 557. Would those be good enough?

The stage can be used with both oversampling and non-oversampling.
Simulation shows 2nd harmonic to increase 8dB and 3rd harmonic to increase 10dB when using BC547B and BC557A.
They are supposedly inferior sounding parts as well; get some 2SC2240BL and 2SA970BL from Jocko, let me know how much he wants for 2*50 pieces
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Old 10th November 2003, 11:38 AM   #12
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Quote:
Originally posted by Peter Daniel
I got some BC547 and 557. Would those be good enough?

The stage can be used with both oversampling and non-oversampling.
use the BC547C & 557C. These have higher current gain.

Terry
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Old 10th November 2003, 11:49 AM   #13
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Quote:
They are supposedly inferior sounding parts as well; get some 2SC2240BL and 2SA970BL
Thanks,

I can get them easily.

Bartek
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Old 10th November 2003, 03:04 PM   #14
Pedja is offline Pedja  Serbia
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Hi Rudolf,

Excellent, as always.

Did I understand you: you started using a complementary feedback pairs for all transistors but found the option you posted here better? Did you mean literally all? If CFP is used as a signal transistor (T8), I canít see much point of using T6 at all.

Nice to see the TL431 used as a voltage references for the current sources.

As about the SPICE and distortion, it is possible to get the useful conclusions this way but youíll hardly simulate the difference in distortion between certain types of transistors. Sometimes the difference shown by various SPICE models for the same transistor is bigger than differences between the various transistors.

Pedja
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Old 10th November 2003, 07:16 PM   #15
Bricolo is offline Bricolo  France
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Quote:
Originally posted by rbroer

The I/V doesn't care about oversampling or not...
Maybe the question Peter wanted to ask (and mee too ) is:
does it need an additional filter when used with a non oversampling dac?

If yes, what filter would fil?
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Old 11th November 2003, 07:22 AM   #16
rbroer is offline rbroer  Netherlands
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Quote:
Originally posted by Pedja
Did I understand you: you started using a complementary feedback pairs for all transistors but found the option you posted here better? Did you mean literally all? If CFP is used as a signal transistor (T8), I canít see much point of using T6 at all.
Pedja
Yep, I mean what I wrote, there was a CFP (1k feedback resistor) for each individual transistor in the schematic.
Turned out I made a nice UHF oscillator
Well T6 enables me to skip the coupling capacitor Pedja.


Quote:
Originally posted by Bricolo
Maybe the question Peter wanted to ask (and mee too ) is:
does it need an additional filter when used with a non oversampling dac?
If yes, what filter would fil?
Could be. I'm not into the non-oversampling hype
You might wanna read at the begin of this thread


BTW, I started with the version for the TDA1543, should be able to post next weekend.
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Old 11th November 2003, 10:24 AM   #17
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Quote:
Originally posted by rbroer

Yep, I mean what I wrote, there was a CFP (1k feedback resistor) for each individual transistor in the schematic.
Turned out I made a nice UHF oscillator
Well T6 enables me to skip the coupling capacitor Pedja.

Could be. I'm not into the non-oversampling hype
You might wanna read at the begin of this thread

BTW, I started with the version for the TDA1543, should be able to post next weekend.
Nice design.

Myself and C. Buckingham have implemented heaps of these
I-V's. BJT, Jfet, MOS, folded and non-folded, SE complementary etc
etc.

Getting the the CFP's to not oscillate is no problem,
must have base stoppers on some or all BJTs, also
uninterupted gnd plane and good bypasses help.

Getting CFP to sound as good as non CFP *IS* a problem.
It always had an amazingly clean presentation (it will have
lower THD) but just seemed to lack the utter naturalness of
non CFP iterations. In our experience, CFP is sterile, non-CFP
sings.

WRT BC557/547 Vs 2sa970/sc2240 (BL) , you can get VG
results with 557C/547C but having checked the data sheets
of 970/2240 they DO look even better WRT Hfe linearity vs
current over a wide range, also have very low noise.

Gotta try some a those.... should have known Jocko :-)

Cheers,

Terry
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Old 11th November 2003, 10:38 AM   #18
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Default Help with abreviations

Quote:
Getting CFP to sound as good as non CFP *IS* a problem.
What is CFP? I'm not good with abreviations!

Thanks,


Audiofanatic
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Old 11th November 2003, 10:58 AM   #19
Bricolo is offline Bricolo  France
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complementary feedback pair?
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Old 11th November 2003, 12:56 PM   #20
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Quote:
Originally posted by rbroer

Could be. I'm not into the non-oversampling hype
Does that mean you are still oversampled?
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