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Revisiting some "old" ideas from 1970's - IPS, OPS
Revisiting some "old" ideas from 1970's - IPS, OPS
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Old 16th August 2017, 07:47 AM   #2221
Bangla H is offline Bangla H  Germany
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Default Part properties

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..... go into the parts properties and select Attached Pattern and change it there. As long as the RefDes and the net names haven't changed everything will remain when you renew the layout.
Yes, thanks Jeff, that should be my second thought, i will test possibilities to find a solution for my use.
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Old 8th September 2017, 03:41 PM   #2222
filenet is online now filenet
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Few months ago i get from Jeff the complete set of boards to build an NS amplifier. The end result you can see in the pictures.
Many thanks for Jeff and Valery for the great advice and support in the process of building. I found working with SMD component easier than with THT.
I listened to VFA and CFA IPSs till now and i can assure you that both sound stunning. The entire sound give you a sense of big and detail in the same time. I don`t know what you will ask more for an amplifier to sound.
The best amp that i build till now, a no compromise design.


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Old 8th September 2017, 04:52 PM   #2223
vzaichenko is offline vzaichenko  Russian Federation
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Revisiting some "old" ideas from 1970's - IPS, OPS
Hi Filenet,

Thank you for the great build, measurements and warm feedback!
Excellent job - careful, clean, with a lot of attention to details.

Have fun!

Cheers,
Valery
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Old 8th September 2017, 05:42 PM   #2224
rhythmsandy is offline rhythmsandy
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Quote:
Originally Posted by AndrewT View Post
Because Hitachi were the only one to develop high power Lateral mosFETs and they sold off the company to become Renesas.
All the others are either licensed by Renesas, or actually made in the same factory.

Go back to the earthquake that took out a large part of South Japan. The one factory manufacturing Laterals needed a couple of years to get production running again.
The whole world supply dried up. There was NOTHING available from anywhere else.
It seems the one factory makes all the big Laterals.
And that probably explains why all the datasheets are nearly identical.
Minor power and current variations depending on how they attach the die to the copper backplate.
what about the exicon lateral mosfets? I believe they are still producing.
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Old 9th September 2017, 03:53 PM   #2225
AndrewT is offline AndrewT  Scotland
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Quote:
And that probably explains why all the datasheets are nearly identical. Minor power and current variations depending on how they attach the die to the copper backplate.
Quote:
Originally Posted by rhythmsandy View Post
what about the exicon lateral mosfets? I believe they are still producing.
The exicon Laterals seem to be near identical to all the other big power Laterals, look at the datasheets if you don't believe me.
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Old 10th September 2017, 06:33 PM   #2226
vzaichenko is offline vzaichenko  Russian Federation
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Revisiting some "old" ideas from 1970's - IPS, OPS
Arrow Aureaux high-quality no-global-loop headphone amp design

Hi All,

Being focused on low-loop-gain / no global loop power amps this year, I have designed a few circuits, utilizing only local feedback loops, maintaining high linearity and wide bandwidth, providing excellent “short” harmonic profiles (only 2-nd and 3-rd harmonics are noticeable) for top quality sound reproduction.

Here is the “younger brother” of those amps – headphone amplifier with current-driven VAS (partially re-using some ideas from Lichtstark front-end), class A output stage and no global feedback loop. Interesting specialty of no-global-loop designs – there must be a sufficient buffer between the VAS and OPS for impedance matching and preventing the OPS’s input impedance modulation from influencing the open-loop front-end’s performance. It's a pity mid-power lateral MOSFETs are not really available these days - perfect devices for the purpose.

Key observations:
THD20 < 0.003% @ 50mW / < 0.005% @ 100mW (32 ohm load – simulated spectrums).
Fast enough step response with no overshoot, clean clipping.
Output HexFETs’ quiescent current is 180…200mA.
Both RCA (unbalanced) and XLR (Balanced) inputs are supported.
I recommend to use some simple soft-start / protection board for keeping the precious headphones safe.

It’s not tested live as yes, I have also got no layout for it right now, although schematic is available in Diptrace. Thoughts, ideas, possible help with layout design and testing – welcome 😉

Cheers,
Valery

P.S. Left schematic shows the IPS/VAS with separate transistors for better view on topology, the right one - same thing, but using the dual pairs.
Attached Images
File Type: jpg Aureaux-sch-00.JPG (183.5 KB, 805 views)
File Type: jpg Aureaux-sch-01.JPG (184.3 KB, 815 views)
File Type: jpg Aureaux-sch-02_Spectrum_20K_50mW.JPG (131.2 KB, 671 views)
File Type: jpg Aureaux-sch-03_Spectrum_20K_100mW.JPG (132.9 KB, 434 views)
File Type: jpg Aureaux-sch-04_Square_wave_20KHz.JPG (91.7 KB, 407 views)
File Type: jpg Aureaux-sch-05_Clipping_20KHz.JPG (96.2 KB, 152 views)
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Old 11th September 2017, 10:33 AM   #2227
vzaichenko is offline vzaichenko  Russian Federation
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Revisiting some &quot;old&quot; ideas from 1970's - IPS, OPS
Forgot to mention - voltage gain is set to 10db.
It can be adjusted by changing the value of R21 (i-to-V conversion, lower value -> lower gain and vice versa).
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Old 13th September 2017, 06:43 PM   #2228
Bangla H is offline Bangla H  Germany
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Default Parllel LT

Based on schematic,last advice for parts, i have tried a compact as possible Board with most esthetik symetric placement of parts.
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File Type: jpg V Parallel LT Lux FE v2 14.08.2017.jpg (112.5 KB, 335 views)
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Old 13th September 2017, 06:57 PM   #2229
vzaichenko is offline vzaichenko  Russian Federation
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Revisiting some &quot;old&quot; ideas from 1970's - IPS, OPS
Looking good - I like it
Although, SMD version would be even smaller
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Old 14th September 2017, 05:34 PM   #2230
Bangla H is offline Bangla H  Germany
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Thanks for kind answer.
I have found that way, if i place first parts near like schematic, like your work, it makes it
simpler to view.... placement...traces....lesson learned.
Yes, yes SMD is Future and i collect some informations to work with over last month now.
Libary in Diptrace is good filled with useable parts so i will try that Challange next.....some month
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