Mosfet boxmod

[jacosta951]

Just needing a bit of hep/advise from anyone. Is this the type of mosfet i should use to protect my switch.

IRLP3034PBF International Rectifier | IRLP3034PBF-ND | DigiKey

 

[jacosta951]

nothing eh? lol

 

[SupplyDaddy]

Yea, we don't jump up and scream "Use a Mosfet" like they do on the face book groups... But the mosfet you posted is the generally accepted one for switch use, along with a 15 kohm 1/4 watt resistor.

 

[Uncletattoowhat]

 

[jacosta951]

Yea, we don't jump up and scream "Use a Mosfet" like they do on the face book groups... But the mosfet you posted is the generally accepted one for switch use, along with a 15 kohm 1/4 watt resistor.

thank you!!! =) just wanted to make sure i purchase the correct one =0)

 

[1sweetlover]

Can you use a 15k ohm 1/2 watt resistor rather than a 1/4 watt?

 

[WKS01]

Can you use a 15k ohm 1/2 watt resistor rather than a 1/4 watt?

Yes, 1/2W will just be slightly larger.

 

[The Curse of Millhaven]

Can that mosfet be made into a touch switch? I have been using an irl3103 and would like something with a lower Rds(on) I bought a 5-pack of the 3034s and it does not like to turn on fully across the fingers.

 

[SupplyDaddy]

The 3034 is the recommended mosfet. It should work fine for your touch application.

~sent from my galaxy mega using taptalk~

 

[The Curse of Millhaven]

Thanks @SupplyDaddy, that is what I thought. The problem is that when I wire it up, 4 volts will not turn the mosfet all of the way on even with a switch, let alone a finger. If I hook it up to stacked batteries (briefly, just to test) it works great. If I hook it up to the 5v power supply on the breadboard, it works great. If I switch that power supply to 3.3 volts it won't turn fully on again. Basically, is one battery enough to open the gate? If so, why else might my gate not be opening fully?

 

[SupplyDaddy]

1 volt is all that is needed according to the data sheet. I normally use the 8478, when i do use a mosfet, due to lower power requirements of my mods (75 watts verses 375..) so I dont have any practical experience with the 3034.

~sent from my galaxy mega using taptalk~

 

[WKS01]

A MOSFET is a voltage controlled "switch". For example the 3034 data sheet shows it starts to conduct with a gate threshold voltage of 1-2.5V though it only is conducting about 250 microamps. I believe the voltage would be around 10V for the MOSFET to be fully turned on, but even 4.5V+ would work with a fairly low RDS_on. 3.3V might just be too little to get any noticeable function.

 

[WharfRat1976]

Here is my build with a 3034 off a single 18650. She opens and closes every time.

So 3.7v to 4v operates the 3034.

 

[The Curse of Millhaven]

Hmm. With the glare i can't see the stripe colors...what is your resistor value?

 

[JimmyDB]

Hmm. With the glare i can't see the stripe colors...what is your resistor value?

This just got serious!

BTW: I like that it's a bottom feeder.

 

[WharfRat1976]

Hmm. With the glare i can't see the stripe colors...what is your resistor value?

It's a 15K.

 

[The Curse of Millhaven]

Hmm. I am using a 2m resistor. That worked really well with the IRL3103 and a touch switch. Maybe I will drop down to the recommended values and try again. That's helpful. Thanks.