Mine is the mosfet version, dunno why he hate schottky and prefer to do some transistor matching.
Trying to improve 20kHz performance without canceling its timing error is also difficult job.
May be he just need to be a little moderate.
Anyway I am now able to remove crossover spike and removing preEC stage, and it finished.
Trying to improve 20kHz performance without canceling its timing error is also difficult job.
May be he just need to be a little moderate.
Anyway I am now able to remove crossover spike and removing preEC stage, and it finished.
Ontoaba
your researches are great for me
I am planning to built one of your mosfet versions
please explain if the circuits are only theoretical/simulated
or ready to build? and then which transistors should be thermal coupled?
AB2-BJT-PP3
Here are the first simulations with Edmond's new AB2 PP output stage connected with my input stage I used in other simulation.
As Edmond promised this OPS can do square wave test mutch better, here are simulations charts.
Damir
Here are the first simulations with Edmond's new AB2 PP output stage connected with my input stage I used in other simulation.
As Edmond promised this OPS can do square wave test mutch better, here are simulations charts.
Damir
Attachments
cross-conduction
Hi Damir,
Indeed, that looks better. But I also urge you to watch the currents through the OP devices. How large is the cross-conduction?
BTW, you are confusing me a bit. I thought you were after an OPS you could tie on your tube pre-amp. Therefore I'm busy with a high input impedance and low offset version of AB2.
Cheers,
E.
Hi Damir,
Indeed, that looks better. But I also urge you to watch the currents through the OP devices. How large is the cross-conduction?
BTW, you are confusing me a bit. I thought you were after an OPS you could tie on your tube pre-amp. Therefore I'm busy with a high input impedance and low offset version of AB2.
Cheers,
E.
Edmond
Merry Christmas and a prosperous New Year to you and your girlfriend.
BTW 1: I'll PM you my new email, I lost the password on the email that you use when the HD crashed.
BTW 2: I respect you, posting a circuit and an idea, knowing that some idiots will try to improve the circuit without understanding the most basics issues. A very good reason why I don't post schematics.
Cheers
Stein
Merry Christmas and a prosperous New Year to you and your girlfriend.
BTW 1: I'll PM you my new email, I lost the password on the email that you use when the HD crashed.
BTW 2: I respect you, posting a circuit and an idea, knowing that some idiots will try to improve the circuit without understanding the most basics issues. A very good reason why I don't post schematics.
Cheers
Stein
patents & temper
Hi Stein,
Thank you for your kind words and a 'distortion-less' New Year!
Regarding those 'Einsteins', it' not easy to keep my temper, in particular when a I have spent months to optimize a circuit and then some smart pant thinks he can improve it in a split second.
I respect you policy to not share your ideas with anybody else. OTOH, the reason I do share my ideas is that I'm fiercely against the current patent practice and I hope that publishing those ideas will prevent that others will apply for a patent. Not that it always helps, see the TMC patent.
Cheers,
E.
Hi Stein,
Thank you for your kind words and a 'distortion-less' New Year!
Regarding those 'Einsteins', it' not easy to keep my temper, in particular when a I have spent months to optimize a circuit and then some smart pant thinks he can improve it in a split second.
I respect you policy to not share your ideas with anybody else. OTOH, the reason I do share my ideas is that I'm fiercely against the current patent practice and I hope that publishing those ideas will prevent that others will apply for a patent. Not that it always helps, see the TMC patent.
Cheers,
E.
Edmond, It is human nature for people to experiment. It is something you need to accept if you post your designs (which I certainly hope you will continue to do). My advice would be if you get angry, refrain from posting until you have settled down. Then post a well reasoned comment about why you don't think it is a good idea, and leave it at that 
Tony.
Hi Edmond,
Yes I would like to use it with tupbe pre and no global feedback, but simulating like I did shows me more about stability. I will simulate it separately too.
How large is the cross-conduction? I am not sure if this chart shows cross-conduction!!
Damir
Yes I would like to use it with tupbe pre and no global feedback, but simulating like I did shows me more about stability. I will simulate it separately too.
How large is the cross-conduction? I am not sure if this chart shows cross-conduction!!
Damir
Attachments
did I write that I am not going to use the drivers?
even if I do not understand all of the dist-cancel mechanism aspect, some other ideas are interesting for me and I admire them, and for this I was punished.
Anyway wish better 2012 for all!
Hi Damir,
If you intend to use it with your tube pre-amp, the AB2 OPS has to be optimized for different properties: high input impedance and low offset voltage. So it makes not much sense to simulate the OPS when integrated with an IPS and VAS and applying global NFB.
Instead, you need to know the properties of the pre-amp output (impedance at DC and AC) and use these impedances in you simulation.
The cross-conduction is determined by the intercept point of the current through 'top' and 'bottom' OP devices. In this case it's about 100mA. Because it appears to be the same as the quiescent current, it's perfectly okay.
But what happens in case of square waves or a sine of say 250kHz? An ideal OPS should show the same (low) cross-conduction, though that's not always possible.
Cheers,
E.
Cross conduction, stability and clip cross conduction is properties of reliability. Better take care of it, because 0.001% THD is enough, or already excelent.
Beware diamond need to be cut in correct shapes, or it will break into pieces. That cross connection is diamond, not just pearl.
BTW: not good to call another is idiot just because feel genius, because it is bad for people relation.
Beware diamond need to be cut in correct shapes, or it will break into pieces. That cross connection is diamond, not just pearl.
BTW: not good to call another is idiot just because feel genius, because it is bad for people relation.
- Status
- This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.