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ugliest power supply

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  ugliest power supply John Larkin <jjlarkin@highlandtechnology.com> - 2017-02-04 12:40 -0800
    Re: ugliest power supply tabbypurr@gmail.com - 2017-02-04 12:50 -0800
      Re: ugliest power supply bitrex <bitrex@de.lete.earthlink.net> - 2017-02-04 16:17 -0500
        Re: ugliest power supply Spehro Pefhany <speffSNIP@interlogDOTyou.knowwhat> - 2017-02-04 18:31 -0500
          Re: ugliest power supply mike <ham789@netzero.net> - 2017-02-04 16:40 -0800
            Re: ugliest power supply bitrex <bitrex@de.lete.earthlink.net> - 2017-02-04 23:28 -0500
              Re: ugliest power supply mike <ham789@netzero.net> - 2017-02-04 23:13 -0800
            Re: ugliest power supply Spehro Pefhany <speffSNIP@interlogDOTyou.knowwhat> - 2017-02-05 00:20 -0500
        Re: ugliest power supply Pimpom <pimpom@invalid.com> - 2017-02-05 10:48 +0530
          Re: ugliest power supply Spehro Pefhany <speffSNIP@interlogDOTyou.knowwhat> - 2017-02-05 00:44 -0500
            Re: ugliest power supply tabbypurr@gmail.com - 2017-02-04 22:10 -0800
            Re: ugliest power supply bitrex <bitrex@de.lete.earthlink.net> - 2017-02-05 10:38 -0500
          Re: ugliest power supply tabbypurr@gmail.com - 2017-02-04 21:54 -0800
    Re: ugliest power supply bitrex <bitrex@de.lete.earthlink.net> - 2017-02-04 16:15 -0500
    Re: ugliest power supply Jeff Liebermann <jeffl@cruzio.com> - 2017-02-04 18:26 -0800
      Re: ugliest power supply Spehro Pefhany <speffSNIP@interlogDOTyou.knowwhat> - 2017-02-04 22:23 -0500
    Re: ugliest power supply legg <legg@nospam.magma.ca> - 2017-02-04 22:10 -0500
      Re: ugliest power supply Spehro Pefhany <speffSNIP@interlogDOTyou.knowwhat> - 2017-02-04 22:41 -0500
        Re: ugliest power supply legg <legg@nospam.magma.ca> - 2017-02-05 22:12 -0500
          Re: ugliest power supply Spehro Pefhany <speffSNIP@interlogDOTyou.knowwhat> - 2017-02-06 17:22 -0500
            Re: ugliest power supply legg <legg@nospam.magma.ca> - 2017-02-07 09:15 -0500
    Re: ugliest power supply "Tim Williams" <tiwill@seventransistorlabs.com> - 2017-02-05 04:27 -0600
      Re: ugliest power supply Lasse Langwadt Christensen <langwadt@fonz.dk> - 2017-02-05 07:45 -0800
    Re: ugliest power supply doh@yipee.com - 2017-02-05 10:17 -0800
      Re: ugliest power supply John Larkin <jjlarkin@highlandtechnology.com> - 2017-02-05 10:57 -0800
        Re: ugliest power supply Spehro Pefhany <speffSNIP@interlogDOTyou.knowwhat> - 2017-02-05 14:29 -0500
          Re: ugliest power supply bitrex <bitrex@de.lete.earthlink.net> - 2017-02-05 15:21 -0500
          Re: ugliest power supply Spehro Pefhany <speffSNIP@interlogDOTyou.knowwhat> - 2017-02-06 08:55 -0500
        Re: ugliest power supply Pimpom <pimpom@invalid.com> - 2017-02-06 10:51 +0530
        Re: ugliest power supply doh@yipee.com - 2017-02-06 12:14 -0800
    Re: ugliest power supply John S <Sophi.2@invalid.org> - 2017-02-05 14:07 -0600
      Re: ugliest power supply Spehro Pefhany <speffSNIP@interlogDOTyou.knowwhat> - 2017-02-05 15:50 -0500
      Re: ugliest power supply "Tim Williams" <tiwill@seventransistorlabs.com> - 2017-02-06 07:02 -0600
        Re: ugliest power supply John S <Sophi.2@invalid.org> - 2017-02-06 14:34 -0600
          Re: ugliest power supply "Tim Williams" <tiwill@seventransistorlabs.com> - 2017-02-06 19:50 -0600
    Re: ugliest power supply legg <legg@nospam.magma.ca> - 2017-02-07 10:14 -0500
      Re: ugliest power supply speff <spehro@gmail.com> - 2017-02-07 08:22 -0800
        Re: ugliest power supply legg <legg@nospam.magma.ca> - 2017-02-07 21:43 -0500
          Re: ugliest power supply Spehro Pefhany <speffSNIP@interlogDOTyou.knowwhat> - 2017-02-07 22:51 -0500
            Re: ugliest power supply legg <legg@nospam.magma.ca> - 2017-02-08 10:24 -0500
    Re: ugliest power supply "Tom Del Rosso" <fizzbintuesday@that-google-mail-domain.com> - 2017-02-11 10:59 -0500
      Re: ugliest power supply legg <legg@nospam.magma.ca> - 2017-02-11 15:32 -0500

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#446637

On Mon, 06 Feb 2017 17:22:06 -0500, Spehro Pefhany
<speffSNIP@interlogDOTyou.knowwhat> wrote:

>On Sun, 05 Feb 2017 22:12:01 -0500, the renowned legg
><legg@nospam.magma.ca> wrote:
>
>>On Sat, 04 Feb 2017 22:41:45 -0500, Spehro Pefhany
>><speffSNIP@interlogDOTyou.knowwhat> wrote:
>>
>>>On Sat, 04 Feb 2017 22:10:19 -0500, the renowned legg
>>><legg@nospam.magma.ca> wrote:
>>>
>>>>https://www.amazon.com/Flexzion-Compact-Power-Supply-15V/dp/B0146K50LI/ref=sr_1_11?s=industrial&ie=UTF8&qid=1486240523&sr=1-11
>>>>Anyone recognize the vendor mark on the 2n3773 bipolar transistor
>>>>case?
>>>>
>>>>RL
>>>
>>>Some Chinese outfit. Should be <25 cents. 
>>>
>>>--sp 
>>Yeah...it's the name of the outfit I'm after.
>
>Oh, all right. 
>
>"Chenyáng" (see the C-Y in the logo?) in Yixing, Jiangsu province and
>may the Morning Sun shine upon you. There are others out there. 

?  http://www.magma.ca/~legg/TVS/2n3773_mark_gs.bmp

Maybe a CS?


>
>>
>>I wouldn't be surprised if reputable independent vendors eventually
>>surface in SEAsia, even if they're using wafer fabs imported from
>>ex-Yugoslavia as scrap-by-weight.
>>
>>RL
>
>I *highly* doubt they have anything whatsoever to do with wafer fabs.
>Probably just slapping dice bought from somewhere else into TO-3
>cases. If you buy any from the factory be sure to arrange inspections.
>
>--sp 

Even if it were a repeatable vanity stamping, used by Flexzion for
their component markings, it would be a step in the right direction.

RL

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#446266

Wonder if Hakko is gonna sue for using their trademarked colors.

Tim

-- 
Seven Transistor Labs, LLC
Electrical Engineering Consultation and Contract Design
Website: http://seventransistorlabs.com


"John Larkin" <jjlarkin@highlandtechnology.com> wrote in message 
news:c0fc9ctujd74b5tv8qe6baifqbffmg3qe6@4ax.com...
> https://www.amazon.com/Flexzion-Compact-Power-Supply-15V/dp/B0146K50LI/ref=sr_1_11?s=industrial&ie=UTF8&qid=1486240523&sr=1-11
>
> $26.99, free shipping.
>
>
> -- 
>
> John Larkin         Highland Technology, Inc
>
> lunatic fringe electronics
> 

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#446282

Den søndag den 5. februar 2017 kl. 11.26.57 UTC+1 skrev Tim Williams:
> Wonder if Hakko is gonna sue for using their trademarked colors.
> 

https://www.sparkfun.com/news/1428

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#446305

On Sat, 04 Feb 2017 12:40:13 -0800, John Larkin
<jjlarkin@highlandtechnology.com> wrote:

>https://www.amazon.com/Flexzion-Compact-Power-Supply-15V/dp/B0146K50LI/ref=sr_1_11?s=industrial&ie=UTF8&qid=1486240523&sr=1-11
>
>$26.99, free shipping.

I hope it includes the crank to wind it up. Also, where is the coin
slot?

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#446315

On Sun, 05 Feb 2017 10:17:51 -0800, doh@yipee.com wrote:

>On Sat, 04 Feb 2017 12:40:13 -0800, John Larkin
><jjlarkin@highlandtechnology.com> wrote:
>
>>https://www.amazon.com/Flexzion-Compact-Power-Supply-15V/dp/B0146K50LI/ref=sr_1_11?s=industrial&ie=UTF8&qid=1486240523&sr=1-11
>>
>>$26.99, free shipping.
>
>I hope it includes the crank to wind it up. Also, where is the coin
>slot?

I wonder what the price is as it leaves the factory.


-- 

John Larkin         Highland Technology, Inc

lunatic fringe electronics 

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#446318

On Sun, 05 Feb 2017 10:57:09 -0800, the renowned John Larkin
<jjlarkin@highlandtechnology.com> wrote:

>On Sun, 05 Feb 2017 10:17:51 -0800, doh@yipee.com wrote:
>
>>On Sat, 04 Feb 2017 12:40:13 -0800, John Larkin
>><jjlarkin@highlandtechnology.com> wrote:
>>
>>>https://www.amazon.com/Flexzion-Compact-Power-Supply-15V/dp/B0146K50LI/ref=sr_1_11?s=industrial&ie=UTF8&qid=1486240523&sr=1-11
>>>
>>>$26.99, free shipping.
>>
>>I hope it includes the crank to wind it up. Also, where is the coin
>>slot?
>
>I wonder what the price is as it leaves the factory.

Probably around CNY70 or ~$10. 

--sp 

-- 
Best regards, 
Spehro Pefhany
Amazon link for AoE 3rd Edition:            http://tinyurl.com/ntrpwu8

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#446324

On 02/05/2017 02:29 PM, Spehro Pefhany wrote:
> On Sun, 05 Feb 2017 10:57:09 -0800, the renowned John Larkin
> <jjlarkin@highlandtechnology.com> wrote:
>
>> On Sun, 05 Feb 2017 10:17:51 -0800, doh@yipee.com wrote:
>>
>>> On Sat, 04 Feb 2017 12:40:13 -0800, John Larkin
>>> <jjlarkin@highlandtechnology.com> wrote:
>>>
>>>> https://www.amazon.com/Flexzion-Compact-Power-Supply-15V/dp/B0146K50LI/ref=sr_1_11?s=industrial&ie=UTF8&qid=1486240523&sr=1-11
>>>>
>>>> $26.99, free shipping.
>>>
>>> I hope it includes the crank to wind it up. Also, where is the coin
>>> slot?
>>
>> I wonder what the price is as it leaves the factory.
>
> Probably around CNY70 or ~$10.
>
> --sp
>

Just from casual inspection of the "naked" photos in the reviews, it 
doesn't look at all terrible on the inside.

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#446403

On Sun, 05 Feb 2017 14:29:11 -0500,  Spehro Pefhany
<speffSNIP@interlogDOTyou.knowwhat> wrote:

>On Sun, 05 Feb 2017 10:57:09 -0800, the renowned John Larkin
><jjlarkin@highlandtechnology.com> wrote:
>
>>On Sun, 05 Feb 2017 10:17:51 -0800, doh@yipee.com wrote:
>>
>>>On Sat, 04 Feb 2017 12:40:13 -0800, John Larkin
>>><jjlarkin@highlandtechnology.com> wrote:
>>>
>>>>https://www.amazon.com/Flexzion-Compact-Power-Supply-15V/dp/B0146K50LI/ref=sr_1_11?s=industrial&ie=UTF8&qid=1486240523&sr=1-11
>>>>
>>>>$26.99, free shipping.
>>>
>>>I hope it includes the crank to wind it up. Also, where is the coin
>>>slot?
>>
>>I wonder what the price is as it leaves the factory.
>
>Probably around CNY70 or ~$10. 
>

Similar, but inferior, models from other companies without the RF
feature and with the more common 240VAC-only input sell for CNY 70
retail including free shipping (mainland only), so I might be a bit
high on that. 

--sp 

-- 
Best regards, 
Spehro Pefhany

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#446375

On 2/6/2017 12:27 AM, John Larkin wrote:
> On Sun, 05 Feb 2017 10:17:51 -0800, doh@yipee.com wrote:
>
>> On Sat, 04 Feb 2017 12:40:13 -0800, John Larkin
>> <jjlarkin@highlandtechnology.com> wrote:
>>
>>> https://www.amazon.com/Flexzion-Compact-Power-Supply-15V/dp/B0146K50LI/ref=sr_1_11?s=industrial&ie=UTF8&qid=1486240523&sr=1-11
>>>
>>> $26.99, free shipping.
>>
>> I hope it includes the crank to wind it up. Also, where is the coin
>> slot?
>
> I wonder what the price is as it leaves the factory.
>
I've often had the same thought about other Chinese products. 
Example: Most smokers here use Chinese gas cigarette lighters, 
many of which have an LED torch powered by three button cells. 
Smuggled to India through Myanmar (Burma) and no doubt passing 
through several stages of profit-making hands, they retail here 
for Rs.5 (~7 US cents) and sometimes 3 for Rs.10.

I also wonder how they manage their shipping costs, even with 
government subsidy. I've seen zener diodes listed in *single* 
quantities at AliExpress, the Chinese eBay, for $0.018 with free 
shipping to India! And it's been my experience that they are very 
reliable even for such truly minor purchases.

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#446452

On Sun, 05 Feb 2017 10:57:09 -0800, John Larkin
<jjlarkin@highlandtechnology.com> wrote:

>On Sun, 05 Feb 2017 10:17:51 -0800, doh@yipee.com wrote:
>
>>On Sat, 04 Feb 2017 12:40:13 -0800, John Larkin
>><jjlarkin@highlandtechnology.com> wrote:
>>
>>>https://www.amazon.com/Flexzion-Compact-Power-Supply-15V/dp/B0146K50LI/ref=sr_1_11?s=industrial&ie=UTF8&qid=1486240523&sr=1-11
>>>
>>>$26.99, free shipping.
>>
>>I hope it includes the crank to wind it up. Also, where is the coin
>>slot?
>
>I wonder what the price is as it leaves the factory.

Factory? Don't you mean garage?

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#446321

On 2/4/2017 2:40 PM, John Larkin wrote:
> https://www.amazon.com/Flexzion-Compact-Power-Supply-15V/dp/B0146K50LI/ref=sr_1_11?s=industrial&ie=UTF8&qid=1486240523&sr=1-11
>
> $26.99, free shipping.

Where is the current limit adjust? I will not have a power supply in my 
lab that does not have a current limit adjust.

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#446328

On Sun, 5 Feb 2017 14:07:00 -0600, the renowned John S
<Sophi.2@invalid.org> wrote:

>On 2/4/2017 2:40 PM, John Larkin wrote:
>> https://www.amazon.com/Flexzion-Compact-Power-Supply-15V/dp/B0146K50LI/ref=sr_1_11?s=industrial&ie=UTF8&qid=1486240523&sr=1-11
>>
>> $26.99, free shipping.
>
>Where is the current limit adjust? I will not have a power supply in my 
>lab that does not have a current limit adjust.
>

It apparently has a current limit and beeper, just not adjustable. 

The pass transistor is not very well heat sinked.

--sp 

-- 
Best regards, 
Spehro Pefhany

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#446398

"John S" <Sophi.2@invalid.org> wrote in message 
news:o780gu$g3k$1@dont-email.me...
> Where is the current limit adjust? I will not have a power supply in my 
> lab that does not have a current limit adjust.

Doesn't matter, it's going to have a fuckoff great cap on the terminals. 
Short it out ==> BANG!  Nice fat spark.

The control loop probably responds equally slowly, too, so when it comes out 
of short, it overshoots to twice the setpoint.

Tim

-- 
Seven Transistor Labs, LLC
Electrical Engineering Consultation and Contract Design
Website: http://seventransistorlabs.com 

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#446456

On 2/6/2017 7:02 AM, Tim Williams wrote:
> "John S" <Sophi.2@invalid.org> wrote in message
> news:o780gu$g3k$1@dont-email.me...
>> Where is the current limit adjust? I will not have a power supply in
>> my lab that does not have a current limit adjust.
>
> Doesn't matter, it's going to have a fuckoff great cap on the terminals.
> Short it out ==> BANG!  Nice fat spark.

It does matter. And I know how to use lab supplies appropriately. Please 
do not assume I am so far below your intelligence that I need for you to 
hold my hand. The professionals here do not need it either. If you have 
that problem, just ask for help.

>
> The control loop probably responds equally slowly, too, so when it comes
> out of short, it overshoots to twice the setpoint.

On *every* power supply? You can't possibly know that.

>
> Tim
>

Cheers

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#446560

"John S" <Sophi.2@invalid.org> wrote in message 
news:o7amg7$1cp$2@dont-email.me...
> It does matter. And I know how to use lab supplies appropriately. Please
> do not assume I am so far below your intelligence that I need for you to
> hold my hand. The professionals here do not need it either. If you have 
> that problem, just ask for help.

Excuse me?  Where was my message patronizing or incorrect?

Proper use goes a long way, and I could've chosen to speak about that 
instead; but I suppose you would've been mad about that, anyway.

Nevermind that there are hundreds of amateur hackers on this newsgroup, who 
appreciate the caution from experienced users.


>> The control loop probably responds equally slowly, too, so when it comes
>> out of short, it overshoots to twice the setpoint.
>
> On *every* power supply? You can't possibly know that.

"Probably" == "every"?  What?

I've sampled a couple of those cheap Chinastan power supplies.  None are 
worth the scrap metal they're made from.  I have not sampled this particular 
one.

If one of those amateur hackers were interested in a fix-it project, they're 
a fine starting point, and a good way to explore everything from proper 
control loop compensation, to proper heatsinking, to proper mechanical 
design -- they variously exhibit severe problems in one or more of these 
areas.

Tim

-- 
Seven Transistor Labs, LLC
Electrical Engineering Consultation and Contract Design
Website: http://seventransistorlabs.com 

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#446641

On Sat, 04 Feb 2017 12:40:13 -0800, John Larkin
<jjlarkin@highlandtechnology.com> wrote:

>https://www.amazon.com/Flexzion-Compact-Power-Supply-15V/dp/B0146K50LI/ref=sr_1_11?s=industrial&ie=UTF8&qid=1486240523&sr=1-11
>
>$26.99, free shipping.

The PS-1501S seems to be offered with a number of brand names on the
front panel - Best and Yihua are common - or just blank, for as low as
US$15. 
Most illustrate the use of STMicro 2n3055 pass transistors on the rear
of the case.
The unbranded Flexzion part is odd in that the pass transistor is
2n3773 in the illustration, from an unrecognized semi fab. 
Some add a USB charging port to the front panel. 

These have been marketed since at least 2014.

Best offers versions -D or -A with all digital or all analog metering.
The dual digital metered version has a dramatically different package
cosmetic appearance. Dual analog pricing is ~US$12.

RL

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#446650

On Tuesday, 7 February 2017 10:14:59 UTC-5, legg  wrote:
> On Sat, 04 Feb 2017 12:40:13 -0800, John Larkin
> <jjlarkin@highlandtechnology.com> wrote:
> 
> >https://www.amazon.com/Flexzion-Compact-Power-Supply-15V/dp/B0146K50LI/ref=sr_1_11?s=industrial&ie=UTF8&qid=1486240523&sr=1-11
> >
> >$26.99, free shipping.
> 
> The PS-1501S seems to be offered with a number of brand names on the
> front panel - Best and Yihua are common - or just blank, for as low as
> US$15. 

The same part number is clearly used by a number of different factories. This is rather common in China.  

> Most illustrate the use of STMicro 2n3055 pass transistors on the rear
> of the case.

They are **marked** ST anyway. If you take the cover off there might be a 
surprisingly small die from some unknown fab stuck in there. 

http://www.cdkands.com/counterfeits.html

You really have to know who you are dealing with first, and sometimes also 
keep a close eye on them. 

> The unbranded Flexzion part is odd in that the pass transistor is
> 2n3773 in the illustration, from an unrecognized semi fab. 
> Some add a USB charging port to the front panel. 

It's the brand of ChenYang (morning sun), like I said. They may be set up there in Yixing because Delta was making power supplies there. All they seem to assemble are crappy TO-3 transistors like the 2N3055. There's at least two other local makers of the 2N3773. 

> These have been marketed since at least 2014.
> 
> Best offers versions -D or -A with all digital or all analog metering.
> The dual digital metered version has a dramatically different package
> cosmetic appearance. Dual analog pricing is ~US$12.
> 
> RL

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#446732

On Tue, 7 Feb 2017 08:22:25 -0800 (PST), speff <spehro@gmail.com>
wrote:

>On Tuesday, 7 February 2017 10:14:59 UTC-5, legg  wrote:
>> On Sat, 04 Feb 2017 12:40:13 -0800, John Larkin
>> <jjlarkin@highlandtechnology.com> wrote:
>> 
>> >https://www.amazon.com/Flexzion-Compact-Power-Supply-15V/dp/B0146K50LI/ref=sr_1_11?s=industrial&ie=UTF8&qid=1486240523&sr=1-11
>> >
>> >$26.99, free shipping.
>> 
>> The PS-1501S seems to be offered with a number of brand names on the
>> front panel - Best and Yihua are common - or just blank, for as low as
>> US$15. 
>
>The same part number is clearly used by a number of different factories. This is rather common in China.  
>
>> Most illustrate the use of STMicro 2n3055 pass transistors on the rear
>> of the case.
>
>They are **marked** ST anyway. If you take the cover off there might be a 
>surprisingly small die from some unknown fab stuck in there. 
>
>http://www.cdkands.com/counterfeits.html
>
>You really have to know who you are dealing with first, and sometimes also 
>keep a close eye on them. 

One of the places where you can't skimp on wafer size is when using
planar epitaxy as linear pass regulators. I expect anything undersized
would have quickly demonstrated an abnormal failure rate, particularly
in small hobby-type practice. I see no evidence reported, of such
behavior in the field. 2N3773 should be overkill, though cost
implications might be insignificant in the present market.
Chinese OEMs have no more time for flakey suppliers than anyone else.

STMicro had plenty of surplus epitaxial power capacity over the years,
from the amalgamation of Thomson/ /Sescosem/ SGS/ ATES in >4 separate
'national' fabs, that could easily have found it's way off-shore. They
were also one of the last West-block fabricators of hometaxial mesa
devices (per the original 3055 and 3773). I expect that a great deal
of STMicro's commodity bipolar transistor capacity could easily be in
Malaysia.

>
>> The unbranded Flexzion part is odd in that the pass transistor is
>> 2n3773 in the illustration, from an unrecognized semi fab. 
>> Some add a USB charging port to the front panel. 
>
>It's the brand of ChenYang (morning sun), like I said. They may be set up there in Yixing because Delta was making power supplies there. All they seem to assemble are crappy TO-3 transistors like the 2N3055. There's at least two other local makers of the 2N3773.

The 'ugly' paint colors were once used by Emerson, on similar product.

I see no company with Cheng Yang in it's name that employs the mark.
http://www.magma.ca/~legg/TVS/2n3773_mark_gs.bmp

Jiangsu Chenyang Electron logo, in particular, is a circular 'CJ' with
3 ones '111' inside it: under some circumstances it might be mistaken
for circle'M' (Marqhardt). It has been in business since '88 and seems
to produce a predictable tooled and assembled product.

The sooner reliable 'local' chinese brands become recognized, the
better. They may then appreciate the value of brand name
protection....

>
>> These have been marketed since at least 2014.
>> 
>> Best offers versions -D or -A with all digital or all analog metering.
>> The dual digital metered version has a dramatically different package
>> cosmetic appearance. Dual analog pricing is ~US$12.
>> 

RL

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#446748

On Tue, 07 Feb 2017 21:43:24 -0500, the renowned legg
<legg@nospam.magma.ca> wrote:

>
>Jiangsu Chenyang Electron logo, in particular, is a circular 'CJ' with
>3 ones '111' inside it: under some circumstances it might be mistaken
>for circle'M' (Marqhardt). It has been in business since '88 and seems
>to produce a predictable tooled and assembled product.

No, not that one- different Chinese characters with a slightly
different meaning. "Morning Sun" =
https://en.wiktionary.org/wiki/%E6%99%A8 +
https://en.wiktionary.org/wiki/%E9%99%BD


This one:

http://sp7150615.zjbiz.net/

They claim to have 200-500 employees, which may or may not have any
validity. That's a shared website. 


Another cautionary tale with "ST" 2N3055s 
https://www.youtube.com/watch?v=5GbBN0fuhtY

(turn the sound off and jump to 1:30 for the image) 

--sp 

-- 
Best regards, 
Spehro Pefhany

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#446779

On Tue, 07 Feb 2017 22:51:39 -0500, Spehro Pefhany
<speffSNIP@interlogDOTyou.knowwhat> wrote:

>On Tue, 07 Feb 2017 21:43:24 -0500, the renowned legg
><legg@nospam.magma.ca> wrote:
>
>>
>>Jiangsu Chenyang Electron logo, in particular, is a circular 'CJ' with
>>3 ones '111' inside it: under some circumstances it might be mistaken
>>for circle'M' (Marqhardt). It has been in business since '88 and seems
>>to produce a predictable tooled and assembled product.
>
>No, not that one- different Chinese characters with a slightly
>different meaning. "Morning Sun" =
>https://en.wiktionary.org/wiki/%E6%99%A8 +
>https://en.wiktionary.org/wiki/%E9%99%BD
>
>
>This one:
>
>http://sp7150615.zjbiz.net/
>
>They claim to have 200-500 employees, which may or may not have any
>validity. That's a shared website.

That's the logo, but I couldn't extract a vendor company name using
simple web character translators, or even spot those for wiktionary's
Chenyang symbols on the semiconductor pages.

I expect that when lower-priced parts can be regularly delivered from
a Chinese mainland company, we'll see them offered (at NA pricing) on
the Digikey or Mouser websites. I see Farnell offers 'Multicomp'
branded parts, which may be the first chink in the wall.
 
>
>
>Another cautionary tale with "ST" 2N3055s 
>https://www.youtube.com/watch?v=5GbBN0fuhtY
>
>(turn the sound off and jump to 1:30 for the image) 
>
>--sp 

Well, hobbyists shouldn't expect a cantilever bond, bumpy mesa wafers
or sealant (illustrated in the 'valid' 2n3055) in the epitaxial Al
stitch-bonded 2n3055s currently marketed, but the epitaxial wafer will
measure roughly 5mm on a side to get the Rthjc of ~1.5C/W for the
commodity part and the case marking will be resistant to wiping with
IPA.

RL

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