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Discrete opamp offset trim
Discrete opamp offset trim
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Old 16th February 2020, 09:59 PM   #31
stinius is offline stinius
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It's good to see that it worked as I expected.

Next time you design an DOPA you should consider looking at what transistor to use in the different places, it's not so that it's best to use high voltage, high hfe transistors all over the place.

BTW: I see that you asked EUVL "Patric" for help on a different matter, please note; EUVL is here for two good reasons, Number 1: selling, Number 2: asking for help to have more to sell.

I'm not surprised that he didn't answer you.

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Old 17th February 2020, 11:44 AM   #32
RCruz is offline RCruz  Switzerland
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Discrete opamp offset trim
Would you please advise on what transistors i should replace for best operation ?
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Old 17th February 2020, 09:06 PM   #33
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Quote:
Originally Posted by RCruz View Post
Would you please advise on what transistors i should replace for best operation ?
Hmm
I said: Next time you design an DOPA you should consider looking at what transistor to use in the different places .............

That was meant as a good advise for you if you plan to "design" a new discrete opamp.
I didn't say that I would design it for you, but it's a good advise and you should consider it when it comes to noise, stability and THD.

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Old 18th February 2020, 07:50 AM   #34
RCruz is offline RCruz  Switzerland
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Discrete opamp offset trim
I really do not want you to design a dopa for me.
I selected the transistors based on low noise, low cob for the vas, power dissipation and speed for the ops and low noise and high inpedance for the ips.
The layout is carefully designed to avoid noise and oscilations.
Maybe you know better so that is wy i asked.
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Old 18th February 2020, 07:52 AM   #35
RCruz is offline RCruz  Switzerland
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Discrete opamp offset trim
You also posted that there are ways to design a better jfet ips dopa..... would you care to elaborate ?
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