Best power supply up to 350usd. Answer (SPD 3033x-e) - Page 1
Forum section: electronics / repair

author: Kaptus
author_rank: Newbie
timestamp: February 18, 2023, 07:32:09 pm
content: Hello, I am looking for a power supply for 300-350USD. I live in Poland, so there are additional taxes and fees. I am looking for a good laboratory power supply. I don't like to buy half-measures. I was thinking about owon p4305 and siglent spd1305x. I've done some reading and spd 1305x seems like a better proposition, but maybe someone knows even better alternatives. I will use the power supply mainly to power portotyping systems and electronics service.Thanks in advance for helping me choose.

author: nightfire
author_rank: Frequent Contributor
timestamp: February 18, 2023, 08:19:38 pm
content: If you want or need to buy new gear, the highend chinese stuff like Siglent, Rigol or GW Instek probably is your road to go.In germany there is welectron that ships also abroad, maybe you can get some decent price here.If you can buy used, there is probably the possibility to pick up some older Gossen Konstanter or HP powersupply, where you also get schematics to be able to repair it.

author: tautech
author_rank: Super Contributor
timestamp: February 18, 2023, 08:19:49 pm
content: Welcome to the forum.With that budget why stop at a single channel PSU when for a few $ more you can have the 3ch SPD3303X-E or is the 10mV/mA resolution insufficient for your needs ?

author: tautech
author_rank: Super Contributor
timestamp: February 18, 2023, 08:22:44 pm
content: Quote from: nightfire on February 18, 2023, 08:19:38 pmThe SPD1305X the OP is already considering is a single channel Siglent PSU offering 300uV max ripple and noise and 30V 5A output with 1 mV/mA resolution.

author: Kaptus
author_rank: Newbie
timestamp: February 18, 2023, 09:41:18 pm
content: Quote from: tautech on February 18, 2023, 08:19:49 pmSPD1305 costs 323,64USDSPD3303X-E costs 417USDPrices in Poland i love it...I saw that SPD3303X-E in USA costs 370usd.

author: tautech
author_rank: Super Contributor
timestamp: February 18, 2023, 09:51:33 pm
content: Quote from: Kaptus on February 18, 2023, 09:41:18 pmDid, they have gone up to $399https://siglentna.com/power-supplies/spd3303x-spd3303x-e-series-programmable-dc-power-supply/Here in NZ we must add 15% GST.But still, 3 channels vs 1 for not much more and you can parallel or series channels 1 and 2 for 30V@6A or 60V@3A with just the press of a button.Not something one normally uses a lot but darn handy when you need it.

author: Kaptus
author_rank: Newbie
timestamp: February 18, 2023, 10:04:55 pm
content: I found a used owon ODP3063 for 380USD. Maybe, You know this power supply? If not, I'll wait a while and collect some mony for the Siglent SPD3303X-E or even the SPD3303X. At least I'll have equipment for really long years.

author: tautech
author_rank: Super Contributor
timestamp: February 18, 2023, 10:15:50 pm
content: Study this:https://www.eevblog.com/forum/testgear/siglent-spd3303x-e-hi-resolution-output-unlock/

author: Kaptus
author_rank: Newbie
timestamp: February 18, 2023, 11:16:05 pm
content: I don't know English very well yet, so even after translating, I don't understand some things. So the spd3303x-e can go down to 1mV/mA without any problems after the update, but it needs to be calibrated.So, what's the differences between these power supplies?

author: tautech
author_rank: Super Contributor
timestamp: February 18, 2023, 11:24:36 pm
content: Quote from: Kaptus on February 18, 2023, 11:16:05 pmNothing except SW but the 2 models run different firmware. See here:https://int.siglent.com/download/firmwares/?ProId=27Same firmware version and we need convince the X-E to be an X model.Keep reading/translating and following links.

author: Kaptus
author_rank: Newbie
timestamp: February 18, 2023, 11:42:39 pm
content: I will read tomorrow because my eyes are already sore from reading. In the morning I sat all day and embraced the transport of thermal cameras from china to Poland, and then until now I read about power supplies.I see that the spd3303x-e has a very large community, so the Owon ODP3063 compares poorly with it.At least I already know what power supply to buy. Thank you very much for your help. As far as I know it's 10.30 in Australia so have a nice day.

author: tautech
author_rank: Super Contributor
timestamp: February 18, 2023, 11:45:28 pm
content: Quote from: Kaptus on February 18, 2023, 11:42:39 pm12.45pm in NZ where we are.

author: Kaptus
author_rank: Newbie
timestamp: February 18, 2023, 11:55:40 pm
content: Quote from: tautech on February 18, 2023, 11:45:28 pm

author: abdulbadii
author_rank: Frequent Contributor
timestamp: February 19, 2023, 12:12:58 am
content: Imho China first class products is best buy eg. Tekpower TP3005P or Siglent Technologies SPD3303X-Ereviewing sitehttps://www.yamanelectronics.com/best-lab-power-supply/#8_Siglent_Technologies_SPD1305X

author: Kaptus
author_rank: Newbie
timestamp: February 19, 2023, 06:05:23 pm
content: Hi. I managed to find a rigol dp823 for 370USD. Used of course. From what I've read, both power supplies are really good, but the rigol has less noise and the resolution can be changed the same as in the 3033e-x. And has an equally large community.Surely you have much more knowledge about these power supplies than me, because I see that you answer for every post. For what would you choose if you were to use these power supplies to power prototype systems and to service electronics. Rather, I will use only 2 channels because I need max 24V 5A.I can't find ripple and noise value for siglent spd3303x-e.Could you please tell me what it looks like in this power supply.

author: Wallace Gasiewicz
author_rank: Super Contributor
timestamp: February 19, 2023, 07:05:34 pm
content: I do not know what you would be using it for.Much older HP and other triple power supplies are quite good. Probably good Euro Brands are more easily available in Poland.Even the old ones without digital readout.You can monitor the voltage with a good multimeter for most purposes.The older power supplies are cheap and can be found at Hamfests and Flea Markets.You can save a lot of money by buying these sometimes.Then you will know what you will need in the futureI would definitely try to get a triple power supply, if it was the only one I usedSome boards require a neg and pos voltage and then a voltage for Transistor Transitor Logic.

author: tautech
author_rank: Super Contributor
timestamp: February 19, 2023, 08:04:38 pm
content: Quote from: Kaptus on February 19, 2023, 06:05:23 pmSPD3303X/X-E for one important reason, truly isolated channels without any common ground.QuoteSee P4:https://int.siglent.com/u_file/download/22_11_25/SPD3303X_DataSheet_E03A.pdf

author: Wallace Gasiewicz
author_rank: Super Contributor
timestamp: February 19, 2023, 08:37:30 pm
content: tautec has an important point. My PS have isolated channels.SPD3303X/X-E for one important reason, truly isolated channels without any common ground.

author: alm
author_rank: Super Contributor
timestamp: February 19, 2023, 09:24:44 pm
content: Quote from: tautech on February 19, 2023, 08:04:38 pmFrom what I remember, this took a while to discover because it only is a problem if CH2 and CH3 are connected in specific ways in the DUT, for example putting CH2 and CH3 in series. Mentioning this, which in many cases can be worked around, without mentioning how severely limited the third channel is on the Siglent SPD3303X (three fixed voltages, no metering, no remote voltage programming and a fixed current limit, as opposed to the fully variable remotely programmable voltage and current and metering on the DP832) is disingenuous, in my opinion.I would say that CH3 has limitations on both the Rigol DP832 (common ground between CH2 and CH3) and Siglent SPD3303X (no metering, very limited voltage and no current adjustment), and which of the limitations affect you the least should guide the choice (other than considerations like price, service in your region and availability).

author: Kaptus
author_rank: Newbie
timestamp: February 19, 2023, 10:59:23 pm
content: As for availability, there is no problem in Poland, everything here is available off-the-shelf. I will think about it and thank you for your feedback.