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How to calibrate Siglent SPD1000X / SPD3303X / SPD3303X-E series power supplies?
oz2cpu:
>I saw your video regarding this old PSU, very impressive!
thanks alot, i had a lot of fun and work out of the making of that video, (if you like teardown videos, see my youtube)
if anyone ever seen this type of zener implementation before ?? please post link ?
I really like to know more about this genius opamp design.
>SSA3021X+
HAHA lucky you.. I got one too, super happy about it
>Yesterday I got an very old idea in mind for the simplest check at least (don‘t lough plz!) I connected the PSU outputs DC-BLOCKED
>with the LF-input of my batterie powered speaker system (avoiding grounding problems) to listen to any noise - nothing!
no one is laughing, this is a perfectly good idea,
I only see one problem : it reveal only noise in the audio range, that type of speaker system can handle,
small pc desk top speakers, are like 100Hz to 10kHz
if you cant hear anything, add more gain ? external opamp ?
actually such noise amp, headphones, could be used to debug alot of things.
but most problems with emc, switchmodes, regulation , stability, is not in the hearable range, either 0-100Hz or over 10kHz..
> I was impressed in your video how good automatic triggering of your SDM3055 runs (the green flashing dot on the top left)
I am not sure i understand what you mean ?
auto trig, is just freerun mode, the meter is not synced to anyting,
I just resently had an SDM3065 for loaner, did not see any problems with it, when my 3055 came back from repair, i had to let it go,
i actually missed it a bit, due to its one more digit resolution in low ohm range, and that is where i play the most at the moment
mawyatt:
"thanks alot, i had a lot of fun and work out of the making of that video, (if you like teardown videos, see my youtube)
if anyone ever seen this type of zener implementation before ?? please post link ?
I really like to know more about this genius opamp design."
Yes this is a very old and clever technique, National even had a hybrid reference that used it back in ~70s. If you can find the old National Linear Databooks, it's shown in those. Almost all the zener based references use it.
Best,
2N3055:
Bootstrapping zener like that by supplying it with self regulated voltage is used a lot. Speaking of Walt Jung, he used it in his super low noise PSUs. OTOH, it might seem common now, but whoever though of it first to create what is basically a recursive regulator (in software parlance), that was quite clever...
oz2cpu:
exactly 3055, it is clever designed,
and the performance speak for it self as explained in the video,
lets challenge any of your brand new, ultra expensive powersupplies, are they just as stable ?
from cold power on and a few hrs ahead ??
I have designed electronic products for 35 years
maybe i did not pay too deep attention to details, when i came to voltage zener refferences :-)
I have not seen this coupling before,
dont you just love it, when something as normal as a teardown, ends with wisdom,
It must be named something ? there must be a tech sheet puplished ?
mawyatt:
Like 2N3055 mentioned, likely called a "Bootstrap Regulator or Reference". This has two stable voltage states, zero and the zener referenced, the 2 resistors and diode force the opamp into the desired zener state. The old 1N821 thru 1N829 series reference diode circuits used this technique as well.
Best,
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