Do you want me to make an amplifier that will smash mine?
ahahahaha... this one was already terrible!...ahahahahah
Now talking serious..... for sure, not doubts will be a top performer...you made a winner.
I have Found 9 milivolts, but it is easy to adjust into resistances...this was not the problem..had not problems..only exploded because some transistors i have used were not good...
heheheh..inverted they do not like to work, and short into the board use to produce fire and smoke.
Happy new year.
I will be concentrated into my own amplifier Mihai, i had already loose my focus for a week long...now back to the job.
Also you do not need big Charlie to tell it is good..you already know, a lot of folks already know that... and there are many hidden inside their shells.... let them move and show themselves to us.
regards,
Carlos
ahahahaha... this one was already terrible!...ahahahahah
Now talking serious..... for sure, not doubts will be a top performer...you made a winner.
I have Found 9 milivolts, but it is easy to adjust into resistances...this was not the problem..had not problems..only exploded because some transistors i have used were not good...
heheheh..inverted they do not like to work, and short into the board use to produce fire and smoke.
Happy new year.
I will be concentrated into my own amplifier Mihai, i had already loose my focus for a week long...now back to the job.
Also you do not need big Charlie to tell it is good..you already know, a lot of folks already know that... and there are many hidden inside their shells.... let them move and show themselves to us.
regards,
Carlos
Re: Do you want me to make an amplifier that will smash mine?
Did you match for Idss input jfets? I had only 0.5mV offset ...
How much current did you use in LTP CCS and in common reference folded cascode CCS?
destroyer X said:
Did you match for Idss input jfets? I had only 0.5mV offset ...
How much current did you use in LTP CCS and in common reference folded cascode CCS?
Negative.... i have not matched.
I know your amplifier is well designed, and will measure perfect..also sound very good.
I do not bother with those details.... all i wanted was to listen the input and to compare.... if 0.5 milivolts or 22 milivolts, to me is almost the same, as we can adjust and match parts if we need that result.
To me, those things are alike headache... we eat pills, drugs...do not matter if the headache is in the frontal head or lateral pain.... i use to let those milivolts in peace, as they do not disturb and i have control on them...i can reduce them to zero into the moment i decide.
Will do comparison in the future, when Precision II was released.... not to publish, just for my pleasure and curiosity
I will be focused on my amplifier from now on.
bye and good luck to your nice thread.... i will be selfish and will be concentrated into mine amplifier.
Carlos
I know your amplifier is well designed, and will measure perfect..also sound very good.
I do not bother with those details.... all i wanted was to listen the input and to compare.... if 0.5 milivolts or 22 milivolts, to me is almost the same, as we can adjust and match parts if we need that result.
To me, those things are alike headache... we eat pills, drugs...do not matter if the headache is in the frontal head or lateral pain.... i use to let those milivolts in peace, as they do not disturb and i have control on them...i can reduce them to zero into the moment i decide.
Will do comparison in the future, when Precision II was released.... not to publish, just for my pleasure and curiosity
I will be focused on my amplifier from now on.
bye and good luck to your nice thread.... i will be selfish and will be concentrated into mine amplifier.
Carlos
ok, ok, sorry ... I will not bother you. I wish you luck with your design and I'll wait for a "face to face" comparison, Precision II vs RMI-FC100 😀
Regards,
Mihai
Regards,
Mihai
Sorry Mihai, we are from different worlds, i use to force things to work
And you make them to be precise not needing adjustments...this is boring to me, as i turn myself unusefull...not needed tweaking.
Also i do not bother myself with things that do not sound...as some milivolts into the output.... this is something do not matters to me... we can fix and finish those milivolts...just a very small and non important detail...say nothing about the amplifier, only that the designer made good calculations and the transistors are behaving exactly as the data sheet and the constructor,builder, have used matched transistors.
I am in the other extreme of the production line...you may be the designer, the Enginneer that complain saying those folks downstairs use to replace resistances to "adjust".... the circuit do not need adjustment!!!!
I am the guy into the production line, a manager i think... i will tell, those kids, young enginneers always think the components obbey what they have readed into the data sheet..... if we were not around that thing would explode!!!
Ahahahaha....
Just that.
Will not publish comparison...will tell you directly if your amplifier was the winner...if you amplifier lost...you will never know, because i hate to bring bad news.
Also, there are another brand, another man that produces the best possible sound...that can eat my amplifiers easy, laughing, and falling down from the chair.... Aspen amplifiers...... he has models that eat mine without any effort...so.... if i will decide to compete... for sure i will compete by the second place...as he makes the better ones.... when you switch on and music starts to play you feel the quality... soft, undistorted, not harshing, not annoying...have class...not sterile, not undefined, not screaming sound.... class....charm...other thing compared with my huge bass punch!
You questions, seems to me alike that folk that asked me if i have placed matched transistors.... then i said i made that...one was 550 and the other was 546.... and this means nothing into sound and offset...and the guy start to say that i made a terrible mistake...they have to be 550 and 550....or 546 and 546.... this is matching!
Yeah.... it is really matching.... for theories .... go to measure and to listen and they will means nothing.
My best wishes...you are very good designer, even destroying your schematic, tweaking everything, using other transistors, operating class AB...well...it continues sounding great...so..it is great!
regards,
Carlos
And you make them to be precise not needing adjustments...this is boring to me, as i turn myself unusefull...not needed tweaking.
Also i do not bother myself with things that do not sound...as some milivolts into the output.... this is something do not matters to me... we can fix and finish those milivolts...just a very small and non important detail...say nothing about the amplifier, only that the designer made good calculations and the transistors are behaving exactly as the data sheet and the constructor,builder, have used matched transistors.
I am in the other extreme of the production line...you may be the designer, the Enginneer that complain saying those folks downstairs use to replace resistances to "adjust".... the circuit do not need adjustment!!!!
I am the guy into the production line, a manager i think... i will tell, those kids, young enginneers always think the components obbey what they have readed into the data sheet..... if we were not around that thing would explode!!!
Ahahahaha....
Just that.
Will not publish comparison...will tell you directly if your amplifier was the winner...if you amplifier lost...you will never know, because i hate to bring bad news.
Also, there are another brand, another man that produces the best possible sound...that can eat my amplifiers easy, laughing, and falling down from the chair.... Aspen amplifiers...... he has models that eat mine without any effort...so.... if i will decide to compete... for sure i will compete by the second place...as he makes the better ones.... when you switch on and music starts to play you feel the quality... soft, undistorted, not harshing, not annoying...have class...not sterile, not undefined, not screaming sound.... class....charm...other thing compared with my huge bass punch!
You questions, seems to me alike that folk that asked me if i have placed matched transistors.... then i said i made that...one was 550 and the other was 546.... and this means nothing into sound and offset...and the guy start to say that i made a terrible mistake...they have to be 550 and 550....or 546 and 546.... this is matching!
Yeah.... it is really matching.... for theories .... go to measure and to listen and they will means nothing.
My best wishes...you are very good designer, even destroying your schematic, tweaking everything, using other transistors, operating class AB...well...it continues sounding great...so..it is great!
regards,
Carlos
Roender i already have output transistors and others Tosh hard to find here, so it's on the way for me.
I will build exactly like yours....But...There always a 'yes but' ...héhéhé
I have problems with your Gerber files with my equipment for PCB and i don't want to untune my software that controlling it for compliance with your files, so i will redraw your amp in Altium DXP and if someone want it , it will be available in another format.
I will build exactly like yours....But...There always a 'yes but' ...héhéhé
I have problems with your Gerber files with my equipment for PCB and i don't want to untune my software that controlling it for compliance with your files, so i will redraw your amp in Altium DXP and if someone want it , it will be available in another format.
DRZ1 said:
Hello Denis,
Please make your Altium version following closely my board. I have past through four PCB versions, one of them with bad sound, until the published one.
Happy New Year,
Mihai
Lol roender, and then you get Carlos... more worried about the board layout and simetry than inductance , long traces, and stray capacitance.
But, we still love him
😀
Are those output transistors expensive?
But, we still love him
😀 Are those output transistors expensive?
I am going to prototype some output boards here in the lab.
The transistors arrived from Digikey on Saturday -- I got 25 of each -- my cost is $4.089 -- for some reason there was no charge for shipping. Anyone who wants a few send me a PM -- no markup. This is your Christmas present from Scrooge in NJ.
The transistors arrived from Digikey on Saturday -- I got 25 of each -- my cost is $4.089 -- for some reason there was no charge for shipping. Anyone who wants a few send me a PM -- no markup. This is your Christmas present from Scrooge in NJ.
Indeed. It is made by LPKF, a 91s.
Software is Circuitcam and Boardmaster.
As you see i did not remove all the copper, will use it as a groundplane.
Greetings, Loek
Software is Circuitcam and Boardmaster.
As you see i did not remove all the copper, will use it as a groundplane.
Greetings, Loek
Re: prototype
Hello Loek,
Don't worry about outside PCB dimensions holes. Two of them are from drivers, mje15034/mje15035, and are not in use.
I'm not sure if it is safe to implement ground plane. In the first stage, when you start the amplifier, try to not connect the plane to ground. See how it works and after that try to find a good point to connect such a huge plane to GND, maybe in main starground. Use a scope to track possible oscillations
Good luck and
Happy New Year!
Mihai
loek said:
Hello Loek,
Don't worry about outside PCB dimensions holes. Two of them are from drivers, mje15034/mje15035, and are not in use.
I'm not sure if it is safe to implement ground plane. In the first stage, when you start the amplifier, try to not connect the plane to ground. See how it works and after that try to find a good point to connect such a huge plane to GND, maybe in main starground. Use a scope to track possible oscillations
Good luck and
Happy New Year!
Mihai
implement ground plane
Hi Mihai,I will start to connect it to starground with 0.1 uF or 10 ohm, but it can last a while ....
Thanks anyway, Loek
Hi Mihai,I will start to connect it to starground with 0.1 uF or 10 ohm, but it can last a while ....
Thanks anyway, Loek
Re: Re: prototype
Speaking of ground planes and amplifiers -- I had some board made up for the LM4702 and LME49810 -- on one set I used a dual star system -- allowing the ground for the driver to be separated from the power ground by a small value resistor, for the second I poured copper. The THD+N% for the board with ground plane is measurably inferior to the dual-star system.roender said:
board with ground plane
Thanks Jackinnj, i had this experience also with the first Leach boards. My FC100 pcb holes are not plated so easy to select the area i want for ground.
Did you read my PM?
Loek
Thanks Jackinnj, i had this experience also with the first Leach boards. My FC100 pcb holes are not plated so easy to select the area i want for ground.
Did you read my PM?
Loek