EEVblog #787 - Mailbag

[max666]

 

[old gregg]

talking about the vactrol shirt, I wonder if Dave watched "I dream of wires" documentary.

Funny how all that modular synth sounds so esoteric when you do know about it 

[senso]

Excuse me, but you but components from dubious origin on eBay for production? I hope your device come with a 5year warranty that cover everything...

All the WS2812 LEDs are made by World Semi as far as I know. Adafruit, eBay... all come from the same factory.

http://www.world-semi.com/en/Driver/Lighting/WS2811/WS212B/

Here's Adafruit's datasheet: https://www.adafruit.com/datasheets/WS2812.pdf

What does it say at the top of the page? "World Semi".

and? The eBay seller tiaochongyi  is not World Semi.

Have you ever heard about fake components, or second hand, or factory rejected chips?

For a small quantity toy, or non professional product, buying on eBay, maybe (even if I will never do that unless that's the only way to buy the component) but for something that have to be manufactured, there is no way to buy from such an unreliable service.

And digikey/mouser are not the cheapest distributors, for sure, but digikey list this component for $2.3/each, mouser they are at $4.03/each when buying, for both sellers, at least 10 of them.

And this eBay guy is able to source them for $2.90 the whole 10 packages (so 0.29/each) ?
Sorry but that look likes too good to be true.

If you are into serious production you contact the manufacturer and order a reel or 10, and there is SO much people using the ws leds, they are not hard to get, they are no exotic or rare, just buy them, oh and dont pay 10x the price because it has a flower in it 

[Fungus]

This just arrived in the post...looks like it's the same seller!   




(See video at 27m44s if you don't get it...)

[Godzil]

What have you ordered?

[Fungus]

What have you ordered?

I actually ran the emulator for a couple of weeks on my desktop to see how well it works. In the end I thought "why not?", it's only $25 delivered.



Now it's here...first impressions are a bit mixed. The red/blue writing above the keys is very low contrast against the shiny faux-carbon-fiber casing. Kinda hard to read. The keys also have very little travel.