Just a little simple project

Why is thee a fuse on something that is supposed to eliminate the need for a fuse ?

I mean, is this just to be used in R&D ?

Mounting holes. What size are they;)?

Regards,

Boris Mohar

Got Knock? - see: Viatrack Printed Circuit Designs (among other things)

void _-void-_ in the obvious place

Cool. Start with a fuse, add a PCB and 40 parts, and wind up with a fuse!

Den onsdag den 10. september 2014 17.28.27 UTC+2 skrev John Larkin:

I'd assume the fuse is only needed if the 40 parts fail, and it's a lot faster than a regular fuse so it might save something expensive

-Lasse

It's not a safety device, and there's no way I'm going to bother attempting to get it approved as such.

People will inevitably be stupid enough to use it in place of protective fuses, so I'm just thinking ahead...

The battery should last quite a while (~2-3 months?), longer without LEDs, but with an isolated supply (battery replacer), it would be fine to use in actual equipment. The supply/load pins are off to one side, so the board could very easily be mounted on right angle pins and soldered or socketed in place.

Tim

Precisely. People so often hope that putting a fuse into a circuit will protect it... ERRRNT, it protects the wiring. The transistor dies in

The purpose of this, is a fuse that opens in (as little as, or even less than) 10us, so your circuit (maybe) doesn't!

The $1 transistor protects the $0.10 fuse, but the $20 electric fuse protects the $1 transistor.

Especially the LT regulator part is in serious need of cost-reducing, but it should be easy enough to make this an "ah screw it, it's only 20 bucks" lab item.

Tim

I have a small market that will beat a path to your door for this. Easily 100-200 pieces in the first year, far more after that. Laser Diodes are expensive.

Steve

Current limiting not enough?

NT

Not sure how fast those things cook off in, but that sounds like a great place to try.

Note it won't help with ESD -- you still need whatever kind of TVS and/or capacitance to handle that.

Tim

On Wed, 10 Sep 2014 22:24:01 -0500, "Tim Williams" Gave us:

Our human contact medical HV supply had like 20us to clamp anything above 17uA. We made them clamp at 11us and 15uA.

The device they supply was for was human contact. The supply merely drove it, but needed the safety features regardless. That was like a 4 year development for Battelle.

It was, after all, 15kV.

Forward-bias ESD can kill a diode laser in a nanosecond, by blowing the facet off.

A good method for protecting them is to use a 1-uF bypass cap and a series transformer to apply modulation.

Cheers

Phil Hobbs