Author Topic: EEVblog 1402 - Rohde & Schwarz NGA100 PSU Teardown + GIVEAWAY  (Read 19879 times)

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Offline Han2k21

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Re: EEVblog 1402 - Rohde & Schwarz NGA100 PSU Teardown + GIVEAWAY
« Reply #25 on: June 25, 2021, 01:26:35 am »
I would be very happy to win PSU for my work.
 

Offline TheGoyNextDoor

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Re: EEVblog 1402 - Rohde & Schwarz NGA100 PSU Teardown + GIVEAWAY
« Reply #26 on: June 25, 2021, 01:52:31 am »
A massive upgrade from my garbage eBay PSU. Gib.
 

Offline Scott Holmes

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Re: EEVblog 1402 - Rohde & Schwarz NGA100 PSU Teardown + GIVEAWAY
« Reply #27 on: June 25, 2021, 02:11:30 am »
That's a sweet power supply.  I'd love to have one.

I'm nearly at the point of building my own.  While R&S have a proper knob and settings buttons, I always liked the old hand crafted metal adjustment dials.  Changing the voltage on a DC supply should feel like cracking a safe.  :P
 

Offline dentaku

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Re: EEVblog 1402 - Rohde & Schwarz NGA100 PSU Teardown + GIVEAWAY
« Reply #28 on: June 25, 2021, 02:11:45 am »
It would be nice to finally have a power supply that lets me control the current.
 

Offline JustMeHere

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Re: EEVblog 1402 - Rohde & Schwarz NGA100 PSU Teardown + GIVEAWAY
« Reply #29 on: June 25, 2021, 02:18:46 am »
If it's got blinky lights and stuff, I'd love to have it on my bench.
 

Offline rmaranhao

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Re: EEVblog 1402 - Rohde & Schwarz NGA100 PSU Teardown + GIVEAWAY
« Reply #30 on: June 25, 2021, 02:23:22 am »
Everyone loves a giveaway!
 

Offline dodge bullets

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Re: EEVblog 1402 - Rohde & Schwarz NGA100 PSU Teardown + GIVEAWAY
« Reply #31 on: June 25, 2021, 02:26:31 am »
those power supplies are awesome.
I would have liked to see how the CC mode reacts when the voltage is on the cusp of triggering it to activate.
 

Offline plurn

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Re: EEVblog 1402 - Rohde & Schwarz NGA100 PSU Teardown + GIVEAWAY
« Reply #32 on: June 25, 2021, 02:32:10 am »
Hi Dave,

I know this was not a full review, but any chance you can test current overshoot too when doing power supply reviews?

Cheers,
Anthony
 

Offline bdunham7

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Re: EEVblog 1402 - Rohde & Schwarz NGA100 PSU Teardown + GIVEAWAY
« Reply #33 on: June 25, 2021, 02:36:52 am »
Those constant current mode overshoots are a major fail!  :wtf:

Oy.  I wonder how it reacts to load impedance changes when in CC mode....... :bullshit:
A 3.5 digit 4.5 digit 5 digit 5.5 digit 6.5 digit 7.5 digit DMM is good enough for most people.
 

Offline 172pilot

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Re: EEVblog 1402 - Rohde & Schwarz NGA100 PSU Teardown + GIVEAWAY
« Reply #34 on: June 25, 2021, 02:40:04 am »
I'd LOVE to have one of these!!  The videos are always great!  The power supply would help in my troubleshooting and fixing of classic arcade stuff..  PacMan boards and the like!
 

Offline tchicago

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Re: EEVblog 1402 - Rohde & Schwarz NGA100 PSU Teardown + GIVEAWAY
« Reply #35 on: June 25, 2021, 02:51:26 am »
What is this brown adhesive tape used to attach transistors to the heatsinks instead of fastening them with a screws?
I've seen that before, seems like some new technology. How is it called?

If this is a permanent thermal conducting adhesive tape, then how do you unglue it to replace a transistor?
 

Offline sir1963

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Re: EEVblog 1402 - Rohde & Schwarz NGA100 PSU Teardown + GIVEAWAY
« Reply #36 on: June 25, 2021, 02:53:58 am »
Oooo pretty, Shinny , would go great in my home workshop

 

Offline tchicago

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Re: EEVblog 1402 - Rohde & Schwarz NGA100 PSU Teardown + GIVEAWAY
« Reply #37 on: June 25, 2021, 03:01:14 am »
The fan starting at high RPM is by design. It is used to reliably start it up, because if you try to start it at low power, the degraded lubrication or degraded bearings may hold the fan and it won't rotate unless maximum torque is applied. Once it started rotating at full speed, the RPM could be safely reduced.

The same algorithm is being used in servers and workstations.
 
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Offline fivesixzero

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Re: EEVblog 1402 - Rohde & Schwarz NGA100 PSU Teardown + GIVEAWAY
« Reply #38 on: June 25, 2021, 03:08:03 am »
Been teaching myself analog design while fixing up some old HP supplies, starting with a 721A, on to a 723A, then to an E3610A. The leap from those to this R&S is pretty nuts in some ways but in others it’s obvious that linear design hasn’t changed a ton since the 721A came around in 1958.

Also, seeing some basic characterization processes was helpful. I’ve mostly been focused on setting up a good PARD test environment so this was a good reminder to look at overshoot too. I recently picked up a 6060B DC load to replace my home-made loads and I’d love to put an R&S supply through its paces once it’s all set up… :)
 

Offline MRiddickW

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Re: EEVblog 1402 - Rohde & Schwarz NGA100 PSU Teardown + GIVEAWAY
« Reply #39 on: June 25, 2021, 03:36:06 am »
This would have been handy to have before I bought my HP 6626 to put in series for 200 V total! Smaller and not to mention quieter. Of course it's just a tad more expensive.  ;D
Altium Designer 20 | EAGLE 7.7
 

Online mariush

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Re: EEVblog 1402 - Rohde & Schwarz NGA100 PSU Teardown + GIVEAWAY
« Reply #40 on: June 25, 2021, 03:53:32 am »
sure, why not... could use a 2nd linear psu.

can work around those overshoots... quality components inside, nice transformer... looks good to me.
 

Offline icinose

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Re: EEVblog 1402 - Rohde & Schwarz NGA100 PSU Teardown + GIVEAWAY
« Reply #41 on: June 25, 2021, 03:55:12 am »
count me please, need PSU for my hobby
 

Offline petters

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Re: EEVblog 1402 - Rohde & Schwarz NGA100 PSU Teardown + GIVEAWAY
« Reply #42 on: June 25, 2021, 04:00:11 am »
Winner winner  :scared:
 

Offline HoBoPanda

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Re: EEVblog 1402 - Rohde & Schwarz NGA100 PSU Teardown + GIVEAWAY
« Reply #43 on: June 25, 2021, 04:25:26 am »
It's been a long while since I posted something, but I wouldn't mind winning one of those.
 

Offline brob

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Re: EEVblog 1402 - Rohde & Schwarz NGA100 PSU Teardown + GIVEAWAY
« Reply #44 on: June 25, 2021, 04:47:54 am »
I'm In

Brent
 

Offline thm_w

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Re: EEVblog 1402 - Rohde & Schwarz NGA100 PSU Teardown + GIVEAWAY
« Reply #45 on: June 25, 2021, 04:56:51 am »
Dual bridge rectifiers on a massive heatsink:
1.4V * 2A * 2, maybe 6W max
Must share design with the 6A version.

What is this brown adhesive tape used to attach transistors to the heatsinks instead of fastening them with a screws?
I've seen that before, seems like some new technology. How is it called?

If this is a permanent thermal conducting adhesive tape, then how do you unglue it to replace a transistor?

Its just thermal tape no? Good thermal tape I'm sure, but I question its long term reliability.
If you need to replace a transistor you'd pull it off.

https://www.parker.com/static_content/parkerimages/chomerics/Articles/ThermallyConductiveTapes_EN_AdvancedPackagingArticle.pdf
https://multimedia.3m.com/mws/media/122119O/3m-thermally-conductive-adhesive-transfer-tapes-8800-series.pdf
Profile -> Modify profile -> Look and Layout ->  Don't show users' signatures
 

Offline boffin

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Re: EEVblog 1402 - Rohde & Schwarz NGA100 PSU Teardown + GIVEAWAY
« Reply #46 on: June 25, 2021, 05:23:51 am »
Can always use a new power supply...
 

Offline torquil

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Re: EEVblog 1402 - Rohde & Schwarz NGA100 PSU Teardown + GIVEAWAY
« Reply #47 on: June 25, 2021, 05:47:30 am »
I'm in!
 

Offline neko

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Re: EEVblog 1402 - Rohde & Schwarz NGA100 PSU Teardown + GIVEAWAY
« Reply #48 on: June 25, 2021, 05:50:00 am »
I'm in!
 

Offline tchicago

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Re: EEVblog 1402 - Rohde & Schwarz NGA100 PSU Teardown + GIVEAWAY
« Reply #49 on: June 25, 2021, 05:56:48 am »

Its just thermal tape no? Good thermal tape I'm sure, but I question its long term reliability.
If you need to replace a transistor you'd pull it off.

https://www.parker.com/static_content/parkerimages/chomerics/Articles/ThermallyConductiveTapes_EN_AdvancedPackagingArticle.pdf
https://multimedia.3m.com/mws/media/122119O/3m-thermally-conductive-adhesive-transfer-tapes-8800-series.pdf

Yes, that tape from your screenshot. It is very strange how it is applied. If it is just a sticky tape, then the exposed surface will probably collect dust over time, from the air moved by the fan. They also say there is nothing special about separating part from the tape for reword: pry or twist. That means mechanically the contact is not very strong, and can probably come off via vibration? Another strange thing is that they say it will soften if heated or immersed in warm water. This is a heatsink, which gets warm/hot by definition, so it will increase chance of separation even more...
 


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