19v linear power supply question

[musikfan]

Hi, I'm new member and have a question about linear power supply. I live in the USA. I'm using a SonicTransporter i9 from SGC with the included 19v 7a power supply. SGC recommends that if using your own linear power supply that "it must be 19V and at least 7 amps".

I was given an LPS which on the back only indicates it's 19 volts. It has a display on the front that when powered up shows 19 (which I assume is the voltage?)

My question is: How can I know or find out if it has the required watts or amps to run the SonicTransporter?

Thanks in advance for any advice and guidance.

 

[bryans]

Do you know who made the LPS? Or ask the person that gave it to you where they got it from. I personally don't know of a technical way to find out. I will leave that for the other techies.

 

[Kal Rubinson]

Does it have an AC fuse? That might give you a clue.

 

[MarkusBarkus]

...are you sure there is no additional sticker or stamped info on the device? Underneath? I think it's actually mandatory to have for public sale. Sometimes the values are "molded" into the housing, and are difficult to see. I end up taking a phone pic and enlarging it these days.

 

[musikfan]

Hi, thanks for all of the responses. I looked all around the outside, including underneath and there is no sticker, stamp or etching of any kind. I took out the fuse, and on one side of fuse there's a # which I think is 1250. On the other side letters, VDE and CA. Please see photos.

 

[Kal Rubinson]

I took out the fuse, and on one side of fuse there's a # which I think is 1250.

Is it 1250 or:
1 @ 250
1 250?
1 / 250?
If so, that means 1amp at 250V which is the equivalent of 250watts and should be capable of 7A @ 19V.
Of course, maybe it is something else. I cannot tell from the picture.

 

[Alrainbow]

if you open the top and bottom cover there maybe more info to help
if You or know someone with a dvm and oscope simple tests under varying loads tell all you need

 

[Kcin]

Unfortunately, the fuse on the ac side doesn't tell too much of a tale with these Chinese power supplies at
their rated current output on the delivery side.

I highly doubt you'll get 7a continuous out of that PS. You would need some serious iron in an LPS for that. There are ways to test for it but it doesn't sound that you have the equipment to do so nor the knowledge.

Plug it in and see what happens. The worst you can do is blow the fuse.

There are dozens of variants of those supplies on aliexpress and ebay... all of them look like they come out of the same factory in China.

https://www.aliexpress.com/item/1005001619579146.html?spm=a2g0o.detail.100009.5.11fb5fe48wDw7h&gps-id=pcDetailLeftTopSell&scm=1007.13482.271138.0&scm_id=1007.13482.271138.0&scm-url=1007.13482.271138.0&pvid=42084108-668c-4e6f-88b3-2302d91d028b&_t=gps-id:pcDetailLeftTopSell,scm-url:1007.13482.271138.0,pvid:42084108-668c-4e6f-88b3-2302d91d028b,tpp_buckets:668%232846%238112%231997&pdp_ext_f=%7B%22sku_id%22%3A%2212000020546996536%22%2C%22sceneId%22%3A%223482%22%7D&pdp_npi=2%40dis%21CAD%21130.52%21120.08%21%21%21%21%21%402101f6ba16634658619475743ea36e%2112000020546996536%21rec

 

[musikfan]

Hi Kal, I took a few more upclose photos. I think they show 16 amp? And there seems to be a space between the 1 and 250. Let me know what you think. Thanks so much for your help. Regards, James

 

[musikfan]

Unfortunately, the fuse on the ac side doesn't tell too much of a tale with these Chinese power supplies at
their rated current output on the delivery side.

I highly doubt you'll get 7a continuous out of that PS. You would need some serious iron in an LPS for that. There are ways to test for it but it doesn't sound that you have the equipment to do so nor the knowledge.

Plug it in and see what happens. The worst you can do is blow the fuse.

There are dozens of variants of those supplies on aliexpress and ebay... all of them look like they come out of the same factory in China.

https://www.aliexpress.com/item/1005001619579146.html?spm=a2g0o.detail.100009.5.11fb5fe48wDw7h&gps-id=pcDetailLeftTopSell&scm=1007.13482.271138.0&scm_id=1007.13482.271138.0&scm-url=1007.13482.271138.0&pvid=42084108-668c-4e6f-88b3-2302d91d028b&_t=gps-id:pcDetailLeftTopSell,scm-url:1007.13482.271138.0,pvid:42084108-668c-4e6f-88b3-2302d91d028b,tpp_buckets:668%232846%238112%231997&pdp_ext_f=%7B%22sku_id%22%3A%2212000020546996536%22%2C%22sceneId%22%3A%223482%22%7D&pdp_npi=2%40dis%21CAD%21130.52%21120.08%21%21%21%21%21%402101f6ba16634658619475743ea36e%2112000020546996536%21rec

Thank you! Much appreciated.

 

[musikfan]

Unfortunately, the fuse on the ac side doesn't tell too much of a tale with these Chinese power supplies at
their rated current output on the delivery side.

I highly doubt you'll get 7a continuous out of that PS. You would need some serious iron in an LPS for that. There are ways to test for it but it doesn't sound that you have the equipment to do so nor the knowledge.

Plug it in and see what happens. The worst you can do is blow the fuse.

There are dozens of variants of those supplies on aliexpress and ebay... all of them look like they come out of the same factory in China.

https://www.aliexpress.com/item/1005001619579146.html?spm=a2g0o.detail.100009.5.11fb5fe48wDw7h&gps-id=pcDetailLeftTopSell&scm=1007.13482.271138.0&scm_id=1007.13482.271138.0&scm-url=1007.13482.271138.0&pvid=42084108-668c-4e6f-88b3-2302d91d028b&_t=gps-id:pcDetailLeftTopSell,scm-url:1007.13482.271138.0,pvid:42084108-668c-4e6f-88b3-2302d91d028b,tpp_buckets:668%232846%238112%231997&pdp_ext_f=%7B%22sku_id%22%3A%2212000020546996536%22%2C%22sceneId%22%3A%223482%22%7D&pdp_npi=2%40dis%21CAD%21130.52%21120.08%21%21%21%21%21%402101f6ba16634658619475743ea36e%2112000020546996536%21rec

I opened the case and took a photo. I'm not sure but it seems to indicate 6a which tells me the max load is 6 amps?

Thanks to everyone for your guidance! I greatly appreciate it.

 

[Kcin]

Unfortunately, that does not help much. The maximum capacity of the AC EMI filter is evidently 6A.

It says nothing about the DC output current capacity that you are interested in.

We know, if we can believe the label of the "Canny Well" mfr. that DC out can't be more than 6A capacity of the AC in.

 

[Kal Rubinson]

We know, if we can believe the label of the "Canny Well" mfr. that DC out can't be more than 6A capacity of the AC in.

Sure but the 6A capacity of the line filter is at 125/250VAC. It can accommodate but not predict a higher amperage at the lower DC voltage output.

 

[InfigoAudio]

I opened the case and took a photo. I'm not sure but it seems to indicate 6a which tells me the max load is 6 amps?

Thanks to everyone for your guidance! I greatly appreciate it.

Can you take a picture of the toroid transformer in there? That should have some texts on it that'll clear this up...
If nothing on it, measure the dimensions of the transformer and it'll be a pretty good indicator of the wattage of that supply.

 

[Audio Addict]

Isn't the general rule amps equal watts divided by voltage? From looking at Small Green Computer's website, I suspect that version would not have more than a 100 watts so amps most likely would be just a little over 5. You would need in the 150 range or more. Small Green Computer does sell one with 300W that has multiple connections with the 19V having 10 Amps.

 

[AMR / iFi audio]

Isn't the general rule amps equal watts divided by voltage? From looking at Small Green Computer's website, I suspect that version would not have more than a 100 watts so amps most likely would be just a little over 5. You would need in the 150 range or more. Small Green Computer does sell one with 300W that has multiple connections with the 19V having 10 Amps.

Yes, that is how you calculate the power.
Can you message them and ask how much power draw your unit has?

 

[Audio Addict]

Can you message them and ask how much power draw your unit has?

Their website says the i9 server needs 7A.

 

[InfigoAudio]

Judging by the posted pictures that look like an exact match, I think this is the power supply in question:

https://www.aliexpress.com/item/1005002583221284.html

It is listed as 19V 7A

 

[AMR / iFi audio]

Their website says the i9 server needs 7A.

I think that you can try that. It should be all right. Even when the servers draw too much current, the internal safety circuits should prevent an excessive current draw.