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>> THE REPLICANT << Experimental 'Steamy & Gasoliney' Sound-System
 Moderated by: Si. Page:  First Page Previous Page  ...  2  3  4  5  6  7   
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 Posted: Tue Dec 20th, 2016 12:57 am
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Bootlegbar
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This is interesting. Thank you guys for the research and the time and effort to post for others to see. Stephen

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 Posted: Thu Feb 9th, 2017 05:56 am
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Si.
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Just to add to the 'experimental junk' on the work bench...
...I thought I'd get some SUPER CAPACITORS to blow-up !! :shocked:

This seems like an excellent cheap place to get them from :-

http://www.ebay.co.uk/itm/Supercapacitor-2-7V-5-5V-0-33F-0-47F-1F-1-5F-2F-4F-10F-1-5-2-8-10-12-16-20Pcs-/371739963986?var=&hash=item568d6db252:m:mZrrX4rtIbJrvSi6ZA-KLRw

They have TONS of different values & sizes & Voltages to choose from.
I bought five 1.5 Farad, 2.7 Volt ones to check out.
They seemed to be the most suitable for space saving & power capacity.
They were pretty cheap I think, at only £1.49p inc. P&P for five.

:bg:

Si.

Attachment: s-l300.jpg (Downloaded 21 times)



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' Mysterious Moose Mountain ' - 1:35n2 - pt.II
http://www.freerails.com/view_topic.php?id=7318&forum_id=17&page=1

' M:R:W Motor Speedway !!! ' - 1:32 Slotcar Racing Layout
http://www.slotforum.com/forums/index.php?showtopic=59295&st=0&a
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 Posted: Thu Feb 9th, 2017 08:56 am
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Helmut
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@Si
I'm afraid what you'll get is just that - some stuff to blow up. Be aware that there are many  outlets around that sell off the factory rejects, same case with cheap Lipos. Tell us your experiences with that SumTingWong store:glad:



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 Posted: Thu Feb 9th, 2017 07:23 pm
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Si.
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@Helmut


Ah, a nay sayer !

My favorite type of customer !!

Always ready & willing to pay TEN TIMES the going rate, for exactly the same stuff.


As a well seasoned & experienced buyer, of large quantities of electronic components, for many years, I can't agree with your assumption.


Also the very fact that buying parts from eBay, allows you to see & read ACCURATE customer feedback, regarding the parts & performance of a supplier, makes comments like yours even more strange.

There's just no reason for busy eBay suppliers of electronic components to sell anything other than 'normal' parts.

They are making plenty of money anyway, so why mess with these 'alleged' factory-rejects ? and have endless returns & complaints.

I have NEVER bought ANY sub-standard parts from this type of supplier, EVER.


I do have a story about a sanded & lasered J74, but that aint what we're talking about here.

I've even come across people who CLAIM that there are 'fakes' of Philips DAC chips about ... Oh dear ...


Over the years, I can hardly recall any instance EVER of actually buying & using ANY duff electronic parts.

Yet the first thing you'll hear when 'the experts' get talking about suppliers, is how MONEY guarantees quality.

What a load of TOSH mate !


It's a 'state of mind' Helmut & I have the good fortune to generally think, buy & design stuff 'outside the box' !


I guess the free glass of Champagne from the 'successful' battery salesman, is enough to convince most people that 'their' money is in safe hands !

Yeah RIGHT !


Si.


The world keeps turning & the supply chain keeps rolling on . . .



____________________

' Mysterious Moose Mountain ' - 1:35n2 - pt.II
http://www.freerails.com/view_topic.php?id=7318&forum_id=17&page=1

' M:R:W Motor Speedway !!! ' - 1:32 Slotcar Racing Layout
http://www.slotforum.com/forums/index.php?showtopic=59295&st=0&a
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 Posted: Thu Feb 9th, 2017 07:40 pm
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Helmut
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@Si
I had such an experience with cheap NiMHs from China - but agreed, I too have done many satisfactory buys for a song from alibaba. It's just about what supplier you choose - remember the pushbutton issue? I'd like to know, if you find the time, what the DC ESR and the leakage current of the cylindrical ( The real supercaps ) types actually is.



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 Posted: Thu Feb 9th, 2017 08:11 pm
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Si.
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@Helmut


Yes, I remember 'the push button issue' very well.

I didn't bother to continue that conversation, since it was obviously going nowhere.


I don't believe for a minute that there are 'cheap copies' of THAT switch out there whatsoever !

It is just a CRAP switch !

It is clearly a problem part, which I could probably write another several long paragraphs about, but why bother ?


It was clear that You, John, Johns club, Me, and probably a ton of others ALL had the same problem with it.

Even in my case, when the switch was speced. and used PROPERLY, and not for 'high strain' solenoid operation !

Also you actually kinda implied that I was wrongly using the switch for a 'low voltage' application as well, which to anyone who 'knows', I was not.


That poorly designed component, I believe, was probably manufactured DECADES ago, yet is still out there & being sold even by supposedly 'decent' suppliers, to this day.


Copies ?

NO ! ... There are no 'copies' of that part.

1 part, 1 set of tools, 1 factory, would be my guess.

I have to say, that I am ASTOUNDED that Rapid Electronics are dealing with THAT switch.

I simply cannot believe that ANY experienced professional parts specer would go near it !


Si.


Now THE RUSSIANS !

They made some seriously GREAT electronic parts, back in the day !

Some of their stuff, really puts European, U.S. and Far East manufacturers to shame.

They also made the odd CRAP part or two as well . . .


Not many though ... The thought of a one way trip to Siberia, kinda makes the factory Q.C. guy do his job well !

In the West of course, MONEY is the motivating factor !



____________________

' Mysterious Moose Mountain ' - 1:35n2 - pt.II
http://www.freerails.com/view_topic.php?id=7318&forum_id=17&page=1

' M:R:W Motor Speedway !!! ' - 1:32 Slotcar Racing Layout
http://www.slotforum.com/forums/index.php?showtopic=59295&st=0&a
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