What lab power supply is this? - Page 1
Forum section: electronics / general

author: nuno
author_rank: Frequent Contributor
timestamp: December 16, 2016, 04:42:52 am
content: A local company is importing this from somewhere and rebranding it, but no specs other than the basic stuff you see in the image. It says it has an "RF signal tester", whatever that really means. Looks like it has 100uA resolution?...Can you recognize this power supply? Thanks

author: bitseeker
author_rank: Super Contributor
timestamp: December 16, 2016, 04:53:26 am
content: I haven't seen this exact faceplate design before, but the overall form factor looks like the typical 30V 3A or 30V 5A power supplies from China.

author: babysitter
author_rank: Frequent Contributor
timestamp: December 16, 2016, 08:49:08 am
content: If it really emitsthis, I suppose you will get in trouble with your local frequency management agency.

author: Dave
author_rank: Super Contributor
timestamp: December 16, 2016, 09:01:01 am
content: Quote from: babysitter on December 16, 2016, 08:49:08 amNo, no, itdetectsup to 10 megawatts of RF.

author: azer
author_rank: Regular Contributor
timestamp: December 16, 2016, 11:53:36 am
content: It's a Yihua 3005dhttp://yihua-gz.com/Products_detail.asp?id=592&sortid=264and yes there is a radio frequency detection option"It has a cell phone radio-frequency detection function, which is of a 4.2V 2A/19V 5A fixed output function. Parameters can be displayed by pressing the key, which is fast and convenient. It is an essential tool for cell phone and laptop repair."

author: nuno
author_rank: Frequent Contributor
timestamp: December 16, 2016, 02:50:48 pm
content: Thanks for the answers guys.Quote from: Dave on December 16, 2016, 09:01:01 amNow that must be a very simple detector circuitQuote from: azer on December 16, 2016, 11:53:36 amThanks azer. Looks like it's a switched power supply after all. No explicit resolution mentioned. Shady description.

author: bitseeker
author_rank: Super Contributor
timestamp: December 16, 2016, 09:47:49 pm
content: Quote from: nuno on December 16, 2016, 02:50:48 pmI wouldn't have expected it to be switched for 5A.Planning a new addition to the bench, nuno?

author: jeroen79
author_rank: Frequent Contributor
timestamp: December 16, 2016, 09:51:16 pm
content: It's described rather weird indeed. A 4.2V/2A RF detector?The way I interpret it is that it has an RF detector that will show the signal strength on the display and output presets for 4.2V/2A (1 Li-Ion cell) and 19V/5A (laptop charger).I wonder what the Sound button does.

author: nctnico
author_rank: Super Contributor
timestamp: December 16, 2016, 10:02:34 pm
content: I guess that RF detection function will be popular in GSM repair shacks in Asia but I can't really think of any other purpose.

author: jeroen79
author_rank: Frequent Contributor
timestamp: December 17, 2016, 01:49:24 am
content: With the stated bandwidth it could be used for other VHF and low UHF transmitters as well.But I would guess that professional repairers would rely on other equipment for testing the radio output.But if you just need to know if the device you're working on transmits something it would have some use.

author: nuno
author_rank: Frequent Contributor
timestamp: December 18, 2016, 01:04:33 am
content: Quote from: bitseeker on December 16, 2016, 09:47:49 pmPrice was so-so, just curious.

author: PointyOintment
author_rank: Frequent Contributor
timestamp: December 18, 2016, 12:40:38 pm
content: Quote from: blueskull on December 18, 2016, 03:44:56 amYou don't want people to see them on your bench, think you're a cell phone repairer, and bring you all their broken phones?

author: madires
author_rank: Super Contributor
timestamp: December 18, 2016, 03:16:42 pm
content: But it would be the right PSU to blow up $3 arduino clonesNo tear-down video on youtube, just one unboxing one. BTW, the cheapest offer I've seen is US$113 (seller in Israel).

author: NiHaoMike
author_rank: Super Contributor
timestamp: December 18, 2016, 03:29:29 pm
content: Odd they chose to limit it to 1.8GHz. It would be more reasonable to also cover the 2.4GHz and maybe 5GHz Wifi bands.

author: madires
author_rank: Super Contributor
timestamp: December 18, 2016, 04:10:40 pm
content: Are mobile phones less ubiquitous than WiFi? And they have bluetooth and WiFi too. I think, a band switch would be useful.

author: NottheDan
author_rank: Frequent Contributor
timestamp: December 18, 2016, 04:15:00 pm
content: Quote from: bitseeker on December 16, 2016, 09:47:49 pmI think their model numbers ending in "D" are the switched ones

author: nuno
author_rank: Frequent Contributor
timestamp: December 18, 2016, 06:45:21 pm
content: Quote from: madires on December 18, 2016, 03:16:42 pmThe price I have here is ~US$73 + VAT from an importer, but they sell exclusively to retailers (I am).