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MOSFET Tail Switch Clickie






Awwhh man!! Was it a teaser? :na:
My hopes went instantly high up when i read the thread title.. Alas a $50 switch is what we all need.. I'm sure there'll be an alternative for like less Amperage ~10Amps.
 
No matter the current rating here, the MOSFET costs as little as .50/ea and as high as 2.00/ea.

The unit would need to be a self contained unit with connections for the external switch, and the load circuit. The unit would contain a MOSFET, the 3V cell, and MAYBE a resistor.

The unit would have to be a reasonable size so it could be integrated in many tail caps.
 
sinner said:
Awwhh man!! Was it a teaser? :na:
My hopes went instantly high up when i read the thread title.. Alas a $50 switch is what we all need.. I'm sure there'll be an alternative for like less Amperage ~10Amps.
Click to expand...

Yeah, I was thinking some of our resident geniuses here might be able to tackle this with a much less expensive option. Seems like this could be done for $10? No?

Maybe not, but $50 seemed WAY HIGH for the parts involved...
 
I will have to agree with Meatball on this one, There are more than two basic components besides a switch a Mosfet itself and a CR2032 Lithium Primary 3V battery (gate needs a push doesnt it) So the tailcap as we see are more of 30mm or maybe longer than that, look ugly as s*** why not use a McClicky.. and there you go. Problem Solved.. :na:
I mean , we just need a switch 4Amps MAX for a Boost Driven 1.8A Single Cell build..
$7 a pop does seem reasonable if it works out 20,000 clicks/lifetime
 
Current - 25A+

Voltage - 12V MAX (20V available for $10 more if needed)

0.0034 ohm Rds(on) MOSFET resistance

Beryllium copper spring(95% more conductive than spring steel), Pure silver plated for extra conductivity, 24K gold plated contact area.

Gold plated contacts from the FETtie to host.

Threaded brass body acts as heatsink for MOSFET in high amperage applications.

Panasonic 1216 coin cell included

"Reverse" Clicky operation.

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Not a complex design at all. You are paying for the "package" mainly. It cost so much because it's unique, and all you have to do is screw it in.

If you want this in one of you hosts just get a MOSFET and a battery and cram it in behind the spring. There is no need to pay so much, or even make a pcb for it, because all hosts are different sizes.

Tsteele search this on digikey:
SI4378DY-T1-E3CT-ND
 
benmwv said:
Not a complex design at all. You are paying for the "package" mainly. It cost so much because it's unique, and all you have to do is screw it in.

If you want this in one of you hosts just get a MOSFET and a battery and cram it in behind the spring. There is no need to pay so much, or even make a pcb for it, because all hosts are different sizes.

Tsteele search this on digikey:
SI4378DY-T1-E3CT-ND
Click to expand...

That is what I was thinking, and it is a pretty neat design. Especially if you are looking for a high current switch. More or less using the mosfet as a relay if I am reading it right.

Basically using a low current switch to trigger a high current switch?
 
Yeah, pretty much.

If you just google "mosfet switch" you will get tons of results showing how to do it.

Basically, the drain of the MOSFET connects to the case, the source goes to the battery negative and the switch connects 3v (from the coin battery) to the gate.
 
I think there were some problems finding clickies for higher current builds. This came up as a neat idea for a cleverly (over?) engineered solution.
 
Problem is that doesn't work if you need a case positive build.

And, that is so overengineered that it actually hurt a little bit to read about it. xD
 
It looks good but $50 for a clicky is kinda pricy. Can't we just find some heavy duty mechanical clickies ? I am sure for that price there are good mechanical alternatives.
 
Blord said:
It looks good but $50 for a clicky is kinda pricy. Can't we just find some heavy duty mechanical clickies ? I am sure for that price there are good mechanical alternatives.
Click to expand...

$50 is WAY overpriced. I was thinking it could be done for $5-$7. But I could be wrong...

Maybe I will work on one. :D
 
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