It's a fully balance design and don't really apply to paradise unless you start changing front end and then do fully balance also change current mirrors arrangement and change servo and then output stage...and finally change RIAA....ooppsss but then you have masterpiece!!!
And just FYI, halving resistors lowers gain so further adjustments were required to obtain the targeted 62.5dB (roughly).
Ricardo, in the Paradise it is aprox. proportional. Lowering resistor values by a factor of two and raising cap values by a factor of two to get the same time constants lowers the gain by ca. 6dB.
Stefanoo, good you found the source of the distortion elsewhere.
I was running out of ideas how it could come from the Masterpiece.
Stefanoo, good you found the source of the distortion elsewhere.
I was running out of ideas how it could come from the Masterpiece.
When you lower the gain noise goes down too but you win nothing because you have to crank the volume of your preamp to get the same loudness.
It could be though that the noise in the bass goes down a bit.
A simulation has to be done to find that out.
Why Stefanoo´s Masterpiece is now so low in noise has to be checked.
I would need the current schematic with all transistors types and details again to simulate it.
It could be though that the noise in the bass goes down a bit.
A simulation has to be done to find that out.
Why Stefanoo´s Masterpiece is now so low in noise has to be checked.
I would need the current schematic with all transistors types and details again to simulate it.
Yes, i put it up for you because you asked me about thermal issues with Fets.
Feucht is a very good source for analog design.
Feucht is a very good source for analog design.
thanks.
Question, I remember finding a little curve traces USB that was pretty good for the money that was originally posted here on the forum by a chinese dude (I will look for that again and post it here)....
Anyway..I would like to ask what is the most used curve tracer here for matching BJTs?
Since Matching in this design is vital, I would like to match device properly on the next built, so I am looking for an inexpensive USB curve tracer that can get low power parts matched pretty well.
Question, I remember finding a little curve traces USB that was pretty good for the money that was originally posted here on the forum by a chinese dude (I will look for that again and post it here)....
Anyway..I would like to ask what is the most used curve tracer here for matching BJTs?
Since Matching in this design is vital, I would like to match device properly on the next built, so I am looking for an inexpensive USB curve tracer that can get low power parts matched pretty well.
here is the thread:
http://www.diyaudio.com/forums/solid-state/151253-diy-curve-tracer-pc.html
also sells on ebay, I can't remember the name of it I have to find it.
I was thinking of getting one.
Do you guys think there could be something better than this for a reasonable price or this is reliable enough?
http://www.diyaudio.com/forums/solid-state/151253-diy-curve-tracer-pc.html
also sells on ebay, I can't remember the name of it I have to find it.
I was thinking of getting one.
Do you guys think there could be something better than this for a reasonable price or this is reliable enough?
I use this one :
Peak Electronic Design Limited - Atlas DCA Pro - Advanced Semiconductor Analyser - Model DCA75
It is pretty cool. You can not use it for power transistors but for low level transistors it is all you need.
Peak Electronic Design Limited - Atlas DCA Pro - Advanced Semiconductor Analyser - Model DCA75
It is pretty cool. You can not use it for power transistors but for low level transistors it is all you need.
yeah it looks pretty cool....but currently out of stock!!!!!!
Which one you think is better? they are both good enough?
Which one you think is better? they are both good enough?
Just FIY the chinese curve tracer can do up to 2.5A and if power supply is enhanced can get up to 5A.
Beolow is quoted from the post
Mainly for the following reasons:
1.The the maximum output voltage is only 36V(It limited by the op amp).
2.My initial design, the maximum measuring current of 5A, and each PCB actually can work in 5A current.
3.Most of the transistor Hfe-Ic curve is under Vce = 5 or 10V.So the maximum voltage on RC is 25V, So RC = 5 ohms is best.The my early have used 6.8 ohm / 4.7 ohm.I'm here with 4.55 ohm reasons is more I have 9.1 ohm resistor.
The PCB compent can work in 5A,But why I set them only work under 2.5A?
Because the HP switch power supply only can output 2.5A, If exceeded, the power will be shut down. you need to restart the power it.
So I produced, select R48 and R50, so that the protection circuit of each PCB around at 2.5A effect.
Beolow is quoted from the post
Mainly for the following reasons:
1.The the maximum output voltage is only 36V(It limited by the op amp).
2.My initial design, the maximum measuring current of 5A, and each PCB actually can work in 5A current.
3.Most of the transistor Hfe-Ic curve is under Vce = 5 or 10V.So the maximum voltage on RC is 25V, So RC = 5 ohms is best.The my early have used 6.8 ohm / 4.7 ohm.I'm here with 4.55 ohm reasons is more I have 9.1 ohm resistor.
The PCB compent can work in 5A,But why I set them only work under 2.5A?
Because the HP switch power supply only can output 2.5A, If exceeded, the power will be shut down. you need to restart the power it.
So I produced, select R48 and R50, so that the protection circuit of each PCB around at 2.5A effect.
OK, so it can measure up to higher voltage and current then the Peak Atlas.
Maybe you can buy it and try it out.
Maybe you can buy it and try it out.
Stefano,
the 75 model has more, e.g. measures JFET Vpinch-off and transconductance, plus has a USB connector to store data on a PC.
the 75 model has more, e.g. measures JFET Vpinch-off and transconductance, plus has a USB connector to store data on a PC.
well but so does the other.
I haven't dug into that in detail, but it looks like you can store and recall and compare curves, am I wrong?
The problem with the 75 is that you can only put 5mA, so if for instance I want to match BJTs on my design which are working at 12mA, I would be unable to do so.
Am I missing something?
I haven't dug into that in detail, but it looks like you can store and recall and compare curves, am I wrong?
The problem with the 75 is that you can only put 5mA, so if for instance I want to match BJTs on my design which are working at 12mA, I would be unable to do so.
Am I missing something?
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