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12vdc linear regulared desktop wart?
12vdc linear regulared desktop wart?
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Old 15th September 2019, 05:43 PM   #1
cgallery is offline cgallery  United States
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Default 12vdc linear regulared desktop wart?

I'm looking for a recommendation for a 12vdc linear regulated desktop wart able to produce about 10-watts.

I'd like a DESKTOP wart if possible, which is sort of a wall wart but has a cord for connection to the receptacle, instead of the blades being built into the wart.

I'd be happy with used. Very difficult to tell if what I'm seeing is regulated or not (typically not I suppose). I figured maybe someone here has experience with a brand of something that ticks the marks.

Jameco has a wall-wart version:
DFU120150/G9760: Jameco Reliapro : 18 Watt 12 VDC 1.5 Amp Regulated Linear Wall Adapter : Power Supplies & Wall Adapters

So I guess that is an option, if I cannot find something else.
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Old 15th September 2019, 10:19 PM   #2
nigelwright7557 is offline nigelwright7557  United Kingdom
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That wall wart looks ok.

Don't buy off ebay or from China.
I bought 4 off ebay that were Chinese made and they lasted about a week before blowing up.
I got some from Farnell and they have been fine.
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Old 15th September 2019, 10:46 PM   #3
voltwide is offline voltwide  Ireland
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Quote:
Originally Posted by cgallery View Post
I'm looking for a recommendation for a 12vdc linear regulated desktop wart able to produce about 10-watts.

I'd like a DESKTOP wart if possible, which is sort of a wall wart but has a cord for connection to the receptacle, instead of the blades being built into the wart.

I'd be happy with used. Very difficult to tell if what I'm seeing is regulated or not (typically not I suppose). I figured maybe someone here has experience with a brand of something that ticks the marks.

Jameco has a wall-wart version:
DFU120150/G9760: Jameco Reliapro : 18 Watt 12 VDC 1.5 Amp Regulated Linear Wall Adapter : Power Supplies & Wall Adapters

So I guess that is an option, if I cannot find something else.
The vendor writes "No agency approvals"
In other words he offers illegal stuff.

A transformer power supply of that kind does not meet requirements of ECO directive because of its poor efficiency.
Such equipment is illegal nowadays and may be destroyed by the customs.
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Last edited by voltwide; 15th September 2019 at 10:50 PM.
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Old 16th September 2019, 12:08 AM   #4
cgallery is offline cgallery  United States
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Quote:
Originally Posted by voltwide View Post
The vendor writes "No agency approvals"
In other words he offers illegal stuff.

A transformer power supply of that kind does not meet requirements of ECO directive because of its poor efficiency.
Such equipment is illegal nowadays and may be destroyed by the customs.

Well the efficiency and availability aren't issues for me.
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Old 16th September 2019, 12:08 AM   #5
cgallery is offline cgallery  United States
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Originally Posted by nigelwright7557 View Post
That wall wart looks ok.

Don't buy off ebay or from China.
I bought 4 off ebay that were Chinese made and they lasted about a week before blowing up.
I got some from Farnell and they have been fine.

If only I could find a version that had a cord instead of plugging directly into a receptacle.
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Old 16th September 2019, 01:48 AM   #6
cgallery is offline cgallery  United States
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Anyone want to take a guess at this?

12VDC 1Amp Power Supply + plug adapter kit complete Tested IOB Archer #273-1653A | eBay

25 watt input and 12 watt output would sort of imply linear, not switching, right? Not efficient enough for switching?

Likely regulated? And made in Taiwan, with Radio Shack label, probably pretty decent?

Also here:
Sonance OPTILINK PS2 Power Supply 12VDC 1A PN# 91356 | eBay

40w input and 14-15 watt output, that seems even less efficient, and it SAYS regulated.

Any thoughts?

Last edited by cgallery; 16th September 2019 at 01:51 AM.
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Old 16th September 2019, 04:54 PM   #7
kodabmx is offline kodabmx  Canada
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12vdc linear regulared desktop wart?
I think both of those are SMPS.

Why do you require a linear supply?
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Old 16th September 2019, 05:12 PM   #8
cgallery is offline cgallery  United States
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Originally Posted by kodabmx View Post
I think both of those are SMPS.

Why do you require a linear supply?
Because I'm powering an old Technics turntable motor controller (SL-6) and switching power supplies present noise issues.

And I'm no expert, but both of those looked largish and I suspected they'd have a transformer, so linear? Or does a transformer not mean linear?

I have 12vdc 1.5a switching warts and they're very small and light.

Feel free to educate me.
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Old 16th September 2019, 06:17 PM   #9
kodabmx is offline kodabmx  Canada
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12vdc linear regulared desktop wart?
It depends on the age. They will certainly be lighter than linear (smaller transformer), but I see no reason why you couldn't use an SMPS and filter the output of that instead. I use SMPS to power RIAA tube phono amplifiers and there is no noise issue. If it needs to be linear, why not build one?

A 12V transformer, a couple of capacitors, and a 7812K should do the job... Still, filtering the SMPS seems easier.
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Old 16th September 2019, 06:19 PM   #10
kodabmx is offline kodabmx  Canada
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12vdc linear regulared desktop wart?
These are relatively quiet, too: AC110 220V Power Supply Adapter Transformer LED Strip 2A 3A 5A 8A DC 5V 12V 24V | eBay
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