Author Topic: Dirty cheap Chinese 12V 30 Amp power supply and its build quality  (Read 7857 times)

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Offline Jay_Diddy_B

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Re: Dirty cheap Chinese 12V 30 Amp power supply and its build quality
« Reply #25 on: March 20, 2017, 02:57:07 pm »
Hi,

There is a safety issue hiding here:




There isn't enough clearance between the metal body of the switch and the connections. The switch is connected to the line side of the power supply and used to select 110 or 220V operation.
A plastic bodied switch would be better.

Regards,

Jay_Diddy_B
 

Offline Jay_Diddy_B

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  • Posts: 1848
  • Country: ca
Re: Dirty cheap Chinese 12V 30 Amp power supply and its build quality
« Reply #26 on: March 20, 2017, 03:06:17 pm »
Hi,

In addition, the primary / secondary spacing looks to be very tight here:



Regards,

Jay_Diddy_B
 

Offline Ratch

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Re: Dirty cheap Chinese 12V 30 Amp power supply and its build quality
« Reply #27 on: March 21, 2017, 02:02:41 pm »
So if you ever come across to this: http://www.ebay.com/itm/172031363750 (all power supplies cost same).

Ordered one less than 13€ and opened it, looked inside, braced myself for flashy magic smoke but that darn worked!

Well anyway it is sold as 220Vac unit but its main capacitors (2) are rated for 250V (should be 400V), 680µF 105C, made by Rubicong   :--
Well anyway output capacitors (3) are rated for 25V 3300µF 105C made by ThongX  ???
Also bridge rectifier is supposed to have a heatsink according to PCB but mine is missing  :--

All other ElCaps are made by ThongX.

And then soldering quality is great because they clearly have a wave soldering machine! Bad news is all components are trough hole and some component legs are very long so I have about 0.1 - 0.2mm clearance between mains and ground because somebody didn't cut the leg.

Otherwise design seems to be pretty okayish for cheap chinese  power supply.

Pics:
http://hal.garde.fi/~fireflower/kuvia/projektit/kotostyskone/20160502_001.jpg
http://hal.garde.fi/~fireflower/kuvia/projektit/kotostyskone/20160502_002.jpg
http://hal.garde.fi/~fireflower/kuvia/projektit/kotostyskone/20160502_003.jpg

So do you think it is worth of 12,5€? :D

Need anyone say more?

Ratch

Hopelessly Pedantic
 


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