How can you even use the smallest switch

[raidy]

Everyone knows the problem. They want to use small switches, but could not withstand the current. This little circuit for much the same as $ 2 solves the problem. It is so sensitive that even a not too dry enough fingers to turn the atty. Or any small switch. The current on the switch is now less then 1/1000 mA.

 

[Gummy Bear]

OK It took me a while to find this thread.
I know that any switch would work for this but,,,
What are you using for the finger contact?

 

[raidy]

rivets, metal tags, brass pins.......

 

[Gummy Bear]

I have been starring at the end of a 510 atty connector. I'd bet that I could find a dead one somewhere in my junk drawer, ha,ha,,,

 

[Jim211]

cool tip and thanks, now I just have to order some of those mosfets or see if I can get some of the ones in my junk drawers to work.

 

[raidy]

cool tip and thanks, now I just have to order some of those mosfets or see if I can get some of the ones in my junk drawers to work.

!!You need EXACTLY the IRL3103, other FETs wont't work with 3.6V!!

 

[stouchon]

I am having trouble finding less than 5000 of the 3103's. Do you have any suppliers that have this part in a lot of 10 or so?

 

[happest]

I am having trouble finding less than 5000 of the 3103's. Do you have any suppliers that have this part in a lot of 10 or so?

Look here
or here

 

[stouchon]

Thanks for the links. Only places from a google search for small quantities I would have to give lots of info to check with "their suppliers". E-bay parts shipping was horrendous taking more than a month to receive.

 

[WillyB]

!!You need EXACTLY the IRL3103, other FETs wont't work with 3.6V!!

And why is that? It seems if it can handle the current we need, and the Gate Threshold Voltage is equal to or less the 2.5V the mosfet should work.

How about.

http://www.jameco.com/Jameco/Products/ProdDS/669943IR.pdf

or

http://www.irf.com/product-info/datasheets/data/irlr3114zpbf.pdf

or

http://www.irf.com/product-info/datasheets/data/irf8736pbf.pdf

And folks should realize that shorting the contacts will fire the switch. So some cauution is required. Also note playing with the resistor value where Raidy shows 2-4M will determine the sensitivity (and dry hand response).

I made a working one but didn't really like it. I tend to leave my thumb/finger on the switch, push then let off a bit, with the TS you gotta remember to pull off completely, I prefer the tactile feel of a large, real switch. Preferably one with a click.

YMMV.

 

[raidy]

because that one ist tested. And because german users has no success with other ones which sould work by datasheet. But you're right, expert can find 100 other types of FET's which work. But i give no support on questions with other configurations.
That's why.

EDIT: First one looks good, last one is SMD. Who can solder SMD?

 

[WillyB]

.... can find 100 other types of FET's which work. But i give no support on questions with other configurations.
That's why.

EDIT: First one looks good, last one is SMD. Who can solder SMD?

This guy.

Who surprisingly has been absent from all these atty posts.

 

[raidy]

This guy.

Who surprisingly has been absent from all these atty posts.

So take a look to the german forum. There a complete pulse electronic with mp an programm which controls fast heatup and temperature of atty. its available in normal DIP and in SMD technologie. But its only made for experts. You seems to be one.

 

[Gummy Bear]

I made a working one but didn't really like it. I tend to leave my thumb/finger on the switch, push then let off a bit, with the TS you gotta remember to pull off completely, I prefer the tactile feel of a large, real switch. Preferably one with a click.

YMMV.

I have a nice small flat tac switch that would be great for this. So just for simple on/off, what would the resistor specks be? I won't need the sensitivity for dry fingers.

 

[asdaq]

WB, last I heard he was busy with 'football season'. I guess this can be quite serious indeed. Maybe we'll see him again after January?

 

[WillyB]

I have a nice small flat tac switch that would be great for this. So just for simple on/off, what would the resistor specks be? I won't need the sensitivity for dry fingers.

With a switch it's even simpler. And you only need one resister and the value is not that critical. In Raidy's diagram just delete the first 1K resistor and just wire direct to 'G' (GND) on the mosfet. Nuck uses a 10k on his 5V Fistpack, bigblue is showing a 47k.

Just use one of the mosfets that need 2.5V or lower to fire. And note you are switching the negative. If you are using it in a pipe or flashlight mod just flip the battery around (making it a positive ground).

Also note a mosfet is no excuse to use a cheap switch. Many vapers 'press' 900+ times a day. folks like roadrash probably double that.

 

[Gummy Bear]

To easy, Thanks.

 

[stouchon]

@raidy

I received the mosfet's and wired up the same as your diagram with led. I am using small steel nails cut off at 1/8 inch for sensors. Sometimes it works great, most times I have to push very hard and move my finger around to get it to fire. It won't fire in my pocket but the inconsistency is tiresome. Should I raise the resistance or lower the resistance or use something besides steel for the sensors?

 

[Jensb]

look at this video.
i also use the electronic and dont have problems. i use a 18k resistor and a 2.2mohm resistor.
also it seems that bigger nails get better contact(for me)


you also might have to dry fingers, just lick little bit sometimes

 

[stouchon]

Licking does work great but not something I really want to be doing in public. I may have to try bigger nails. Thanks for your input.