🤓
The source resistors are necessary because this Toshiba pair is not true complementary.
Unlike the holy 2SJ1530/2SJ201.
The source resistor was chosen to enable optimal harmonic cancellations.
To get rid of the little bit of ringing, try increasing the closed loop gain.
Alternatively, try some bandwidth limiting in the feedback path.
Or a low pass filter of say 100kHz at the input.
Exactly which you like best, you have to try.
Cheers,
Patrick
The source resistors are necessary because this Toshiba pair is not true complementary.
Unlike the holy 2SJ1530/2SJ201.
The source resistor was chosen to enable optimal harmonic cancellations.
To get rid of the little bit of ringing, try increasing the closed loop gain.
Alternatively, try some bandwidth limiting in the feedback path.
Or a low pass filter of say 100kHz at the input.
Exactly which you like best, you have to try.
Cheers,
Patrick
So, my M2OPS is currently rocking the classic look of M2. Like, straight-up original M2 with 0R47 source resistors, no global feedback hocus-pocus. Next up, I'm going to try mixing things up with some global negative feedback (a bit of a sonic experiment).
But before we dive into the land of 'tamed audio', let's just appreciate the raw, unfiltered sound my ears are currently enjoying.
And the first impressions are like, 'Is this the same system?' It's like someone finally cleaned the audio windows! The resolution? Let's just say my music is now in very high-definition👌
Of course, I'm fully aware this could be the 'new toy' effect. We'll see if this audio party keeps going, or if it's just a one-night stand.
😀
But before we dive into the land of 'tamed audio', let's just appreciate the raw, unfiltered sound my ears are currently enjoying.
And the first impressions are like, 'Is this the same system?' It's like someone finally cleaned the audio windows! The resolution? Let's just say my music is now in very high-definition👌
Of course, I'm fully aware this could be the 'new toy' effect. We'll see if this audio party keeps going, or if it's just a one-night stand.
😀
Have you previously tried the M2(X)? If so, would you feel confident about drawing comparisons?
You don't need NFB to reduce distortion.
It is already low enough.
You only need a tiny bit to reduce output impedance.
But if your speakers have flat impedance over frequency, you don't need any feedback.
Patrick
@Studley: No, this is my first M2 experience, so I can't made any comparison.
@EUVL: The measured DF is 27 at 8R, so the output impedance is about 0R3. Really, that is not to high, but seems enough for my speakers now. They have a very strange impedance curve going down to 3R at 150 Hz.
I promise to try some global feedback in the future😎
@EUVL: The measured DF is 27 at 8R, so the output impedance is about 0R3. Really, that is not to high, but seems enough for my speakers now. They have a very strange impedance curve going down to 3R at 150 Hz.
I promise to try some global feedback in the future😎
Pondering sneaking an order in with JLCPCB before the bit May 2 deadline. Before I do, anyone in the US have a spare pair of M2 OPS boards?
Hello
I have my M2 OPS with Thosibas too and i can agree to the test of Harry for changing the opamps.
yes the 828 827 are very closed together. 828 is reall soo smart and smooth.
ada4637 and Ada 4627 are really in the same class as the OPA82x. you can change a little bit the sound you like more.
less deeper bass (828) then use ADA4637/ ada4627 you get morestiffer bass and clearer highs.
opa 1641 doesn´t work, i dont know strange sound cames out..
1655 is really a ver ynice and cheap opamp.
suprise is really the OPA445AP -- should be use in A/B Whammy amp.
kre
Chris