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Old 21st June 2017, 11:41 AM   #16
theSeekerr
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Quote:
Originally Posted by merlin13 View Post
Manufacture for international sales of a Name Brand product like that? Nup, in the quantities they'd be making it'd be well under $10, packaged in the retail boxes stacked on the pallets ready for shipping...

Anything over that the purchasing officer should get fired.
It's not a big-brand product, though, it's a third-party accessory: http://www.teaching.com.au/product/WLMC01 or something very much like it.
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Old 21st June 2017, 11:56 AM   #17
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Prices for making a batch of 100 units.

Resistors 12c
Diodes 10c
Fuses 15c
Fuse Holders 12c
DC Jacks 35c

$8.40 for pcb parts. Guessing these - $5 per PCB, $5 Case, $15 machining and assembly.
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Old 21st June 2017, 12:09 PM   #18
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Doing a build run out of China and push the quantities up for a decent production run (call it thousand or more units, setup costs wouldn't make it worth dicking about under that number...) it'd still be under $10 on the pallet, either with or without a Lego badge on it.

And they're charging over $300 for that piece of shit to charge lithium ion batteries?? Bit of a worry where Uncle Google shows a Lego-badged one is just under $120.


edit - Bit of another worry where an Oz dealer sells a 10 volt DC wall wart (with EU power pins in the picture) for $50
http://www.mooreed.com.au/LEGOregEdu...ryCharger.aspx
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Last edited by merlin13; 21st June 2017 at 12:25 PM. Reason: typing with my elbows again...
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Old 21st June 2017, 12:20 PM   #19
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Education boys... it's where the money is at!

500MA M205 250V FUSE was the culprit.

Muchly appreciated for everyone's help
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Old 21st June 2017, 12:32 PM   #20
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Originally Posted by Satriani View Post


ouch! looks pretty basic for that cost!!

Good luck hope you can get it fixed mate
What a rip, even uses a $6 Jaycar enclosure
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Personally I think it should be compulsory 4 primary school kids to directly experience 240v AC on the tip of one finger.
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Old 21st June 2017, 4:15 PM   #21
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Originally Posted by merlin13 View Post
edit - Bit of another worry where an Oz dealer sells a 10 volt DC wall wart (with EU power pins in the picture) for $50
http://www.mooreed.com.au/LEGOregEdu...ryCharger.aspx
They're US pins.
The EU version can be found here: https://www.myrobotcenter.at/de_at/u...oter-bausaetze

Note it's 39 Euro.
It's designed for use in the USA where multiple mains outlets are 90deg to the way it's done in Au. The usual US double outlet is vertical.
I'd also question why 10V?
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Old 21st June 2017, 5:40 PM   #22
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...They're US pins...
Closer look you might be right there - must get a bigger screen one day. Still wrong one for an Oz seller site though...
Quote:
...I'd also question why 10V?...
Because it's cheaply (!) and badly (!!) engineered - internally that's the sort of design you see in cheap 'n nasty NiCad chargers, let alone something that's supposed to be suitable for Lithiums...

But presumably 10 volts nominal so as to result in have 10 minus 0.6 volts Diode drop minus resistor IR Drop at quiescent full charge battery current.

More than likely though done to suck people in to buy oddball-value voltage sources at Stoopid Prices...
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Old 21st June 2017, 5:56 PM   #23
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Originally Posted by RobRoySyd View Post
About $50 all up, those plastic cases and the 5W resistors are the highest cost components. The PCB may have cost a fair amount too and then there's the hand assembly. It all comes down to how many there's a market for and I suspect less than 100 globally, maybe less than 10.
Those resistors are about $7 USD for 30 on alibaba.
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Old 21st June 2017, 9:51 PM   #24
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Quote:
Originally Posted by merlin13 View Post
Because it's cheaply (!) and badly (!!) engineered - internally that's the sort of design you see in cheap 'n nasty NiCad chargers, let alone something that's supposed to be suitable for Lithiums...

But presumably 10 volts nominal so as to result in have 10 minus 0.6 volts Diode drop minus resistor IR Drop at quiescent full charge battery current.

More than likely though done to suck people in to buy oddball-value voltage sources at Stoopid Prices...
More likely your last sentence. As it's charging Li-Ion AND it's something for schools / kids I'd hope there's proper charge control circuitry somewhere, probably in the battery module itself. In which case exact voltage doesn't matter, it only needs to be a few volts more than the battery voltage.


Quote:
Originally Posted by RyoSaeba View Post
Those resistors are about $7 USD for 30 on alibaba.
I only checked on eBay, probably even cheaper per unit if buying 1,000.

The biggest cost would be the labour fitting and soldering them. I've noticed high power resistors are unusual these days. It's overall cheaper to use a number of low power SMD resistors.

Thing also is the guy whose making these isn't getting $300 each for them, the retailer is. The guy making them would probably get half of that.
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Old 21st June 2017, 10:06 PM   #25
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Originally Posted by RobRoySyd View Post
More likely your last sentence. As it's charging Li-Ion AND it's something for schools / kids I'd hope there's proper charge control circuitry somewhere, probably in the battery module itself. In which case exact voltage doesn't matter, it only needs to be a few volts more than the battery voltage.
Yep, you can see pics of what's in the NXT lithium battery here:
http://www.instructables.com/id/LEGO...Replace-Cells/

Of course if you go to the trouble of following that same dodge instructables article to replace the cells it is a different story.
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