Electronics > Beginners
Voltage "divider" after PSU to highten the resolution?
FriedMule:
Thanks, you are completely correct:-)
My first choice is to buy a unit that I know is build correctly, if not possible, then try build.
What I can not understand is that you can buy a Siglent PSU 1mV/1mA for 377$ but have to go to fantasy-land to get one more zero?
beanflying:
In what I used to do for a real job (when I had one) there was a 'Rule of 4' going from Cast Iron to S/Steel as a build material. Each extra Zero with electronics I reckon is more like a 'Rule of 10' ;)
FriedMule:
LOL yes, like from 7.5 to 8.5 DMM :-)
I have to say that this cheap Siglent or more expensive Rigol, sounds nice, but are they any good??
https://www.siglent.eu/siglent-spd3303x-power-supply.html
https://www.aliexpress.com/item/RIGOL-Programmable-linear-DC-power-supply-digital-programmable-power-supply-DP1116A/32479881210.html?spm=2114.search0104.3.1.28ef2fe63IwMkP&ws_ab_test=searchweb0_0,searchweb201602_10_10065_10068_319_317_10696_10084_453_10083_454_10618_10304_10307_10820_10821_537_10302_536_10902_10059_10884_10887_321_322_10103,searchweb201603_51,ppcSwitch_0&algo_expid=79c0ead5-6aea-4484-a36b-1033ad17f5a5-0&algo_pvid=79c0ead5-6aea-4484-a36b-1033ad17f5a5&transAbTest=ae803_3
Calvin:
Hi,
--- Quote ---My needs is that I would like to make as high a resolution I can ..... when I want to play with more precise values.
--- End quote ---
That doesn't sound like a need or requirement to me, but just a wish.
Do You, resp. Your applications really require better than 1mV, or even 10mV of resolution??
Anyway, as suggested before a dedicated post regulator may get You closer to Your wish.
You may have a look at LinearTechs LT30xx series of regulators ... those look very promising for this kind of application .... search for "High Performance Portable DC Bench Power Supply: Save Money and Free Up Bench Real Estate by Building Your Own" and other Design notes.
See datasheets of LT3045, LT3081, LT3094 etc.
Regarding the Siglent supplys ... when You can live with programmability over PC than the SPD3303C (10mV/10mA) is as good as the SPD3303X-E.
It's a really very well behaved, precise, good power supply ... especially for the price ... and a considerable upgrade from a Korad and crapalikes.
regards Calvin
beanflying:
Or you spend a whole lot less on one good Power Supply a lot closer to home eBay auction: #292071246164 and keep your Korad for general less precise use on the bench.
Unless I needed automated control over a power supply I wouldn't spend my $ on unneeded 'features' over actual specifications of output. So in the short to medium term I will be sticking to my Agilent and a pair of Manson Linear supplies (0-15V @ 60A, and a Triple output with better specs than your Korad) for general use.
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