New to modding, lurked a bit, finally joined

[Nestorpants]

Hello everybody,

Just thought I'd introduce myself.

I got into vaping a few weeks ago and fell in love with modding cause I'm a geek.
Like the title says I built my first box mod this week and ran into an issue with the mosfet. Because of that I've been keeping my build mild in order to keep the amps low and save my switch.

I've benefitted greatly from all the threads on here already and hopefully I can find a guru to help me and maybe help others out that run into the same issues.

 

[Sir2fyablyNutz]

Welcome Nestor. I'm new to the Vape also, but haven't progressed to modding ...yet. Good luck, there is a tremendous amount of information in the forum.

 

[caferacer]

Welcome from a fellow Angeleno!

I am not the guru you seek (far from it in fact!), but I'd love to see photos of the mod you're working on. Would you mind posting some?

 

[Lova]

What kinds of problems do you have with your mosfet?

Also, welcome to ECF, you should check out the modding subforum when you get 5 posts (replies count as posts also) and the server updates your access, so you can access them.

 

[Baditude]

Welcome to the forum.

Baditude's Blogs

 

[Nestorpants]

Thank you for the warm welcomes!

Caferacer - It's nothing pretty but I'll snap some photos and post em up here

Lova - My mosfet is sending battery voltage to the atty when I hit the switch but it's only sending 0.02 - 0.05 amps. I have about 8 amps going into the mosfet and 0 amps coming out when I'm not pressing the switch but for some reason it is not sending hardly any amps through when I do push it.

 

[Lova]

Thank you for the warm welcomes!

Caferacer - It's nothing pretty but I'll snap some photos and post em up here

Lova - My mosfet is sending battery voltage to the atty when I hit the switch but it's only sending 0.02 - 0.05 amps. I have about 8 amps going into the mosfet and 0 amps coming out when I'm not pressing the switch but for some reason it is not sending hardly any amps through when I do push it.

What mosfets are you using as most of them with 3 pins require a specific resistor to be hooked up to the pins which I can't remember right now as i haven't made any other mods except mechs and ones with full chips in them.

Could you tell me the part/mosfet number you are using and what it's rated for?

 

[Nestorpants]

What mosfets are you using as most of them with 3 pins require a specific resistor to be hooked up to the pins which I can't remember right now as i haven't made any other mods except mechs and ones with full chips in them.

Could you tell me the part/mosfet number you are using and what it's rated for?

I've got a 15k ohm resistor bridging the gate and source pins and that seems to work fine for diffusing the voltage to shut it off. Then mosfets I'm using are: NTE2395 and an NTE2987. I also have an IRF510 from another project and the same thing happens with all three mosfets.

 

[Lova]

Have you used a wiring schematic for it or winged it as you made the box? Also do you run your batteries series or parallel? I found this schematic off the net if it helps you troubleshoot your mosfet box: wrong info

 

[Nestorpants]

I've used this schematic with the exception that I'm running a single 18650 battery

 

[Lova]

Edit: wrong info

 

[Nestorpants]

Wow! Lots of information there. Thank you for taking the time to do that. I will take these schematics to the breadboard and see if I can get this thing working and then report back.

 

[Lova]

Wow! Lots of information there. Thank you for taking the time to do that. I will take these schematics to the breadboard and see if I can get this thing working and then report back.

No worries, glad I could help you. The schematic you used was wired completely wrong, no wonder it didn't work when the schematic wiring was trying to pull positive out of the ground pin :'D

Edit: The switch between battery and mosfet is the main kill switch so you don't drain the batteries and have a safety if something goes south and are able to kill the power to the 510-connector

 

[Lova]

Edit: wrong info

 

[somun]

Hey Lova,

I appreciate you taking the time to help the OP but unfortunately you are misleading him/her or anyone that might read this. Your suggested changes are wrong!

Among many other things that are wrong with your schematic, the most obvious one is that you are trying to pass all the high current through that tactile switch which is defeating the whole point of using a mosfet. My guesstimate is that you are confused about P-Channel vs N-Channel mosfets.

Nestorpants please disregard Lova's good intentioned but inaccurate suggestions. I would instead check the pinouts of the mosfet you are using and make sure you soldered it correctly (according to the initial drawing you referred to).

 

[Lova]

Hey Lova,

I appreciate you taking the time to help the OP but unfortunately you are misleading him/her or anyone that might read this. Your suggested changes are wrong!

Among many other things that are wrong with your schematic, the most obvious one is that you are trying to pass all the high current through that tactile switch which is defeating the whole point of using a mosfet. My guesstimate is that you are confused about P-Channel vs N-Channel mosfets.

Nestorpants please disregard Lova's good intentioned but inaccurate suggestions. I would instead check the pinouts of the mosfet you are using and make sure you soldered it correctly (according to the initial drawing you referred to).

Sorry about that, got confused. Editing my posts in this thread.

 

[daleron]

Hello Nestor, welcome to ECF. Make yourself right at home

 

[Lova]

So, apparently I messed up the difference between P-fet and N-fet, the schematics I sent are for P-channel fets with low side switching, and the ones you had are for N-Channel low side switching, sorry for the confusion I caused

 

[Nestorpants]

Thanks for the help folks. I should've specified earlier that I was using N channel mosfets. I posted the issue in the modding section and was told to try out the IRLB3034PBF mosfet so I've ordered one and it should be here in a couple days time. Once it gets here I'll breadboard it and post the results.

Daleron - Thanks! I already feel like I'm at my local vape shop