mosfet issues, suicide watch

[dizmaloner]

Hello all, new to the forum but not to the game. I build wood box mods, and have gotten along just fine until recently I had a few people ask for mosfets to be installed. Im using the irlb3034pbf with a 15k resistor bridging Source and gate..

When tested with a multi meter it shows I get 4.2v to center pin of 510 but when an.atty.is installed it barely fires and the mosfet/resistor heat up. I have tried this with different 510s, switches, and have tried burned through 5 mosfets and resistors. Anyone who can give me any advice would be my saviour

 

[rhelton]

post a pic of how you wired it and the diagram you have used will speed things up.

 

[dizmaloner]

post a pic of how you wired it and the diagram you have used will speed things up.

I bread boarded it, and still had the same results

 

[Zanderist]

Did you read the datasheet for the correct orientation of the mosfet? You may just have it backwards.

 

[dizmaloner]

Did you read the datasheet for the correct orientation of the mosfet? You may just have it backwards.

I actually through trial and error decided to"flip" the mosfet and got no reaction what do ever

 

[Zanderist]

Take a clear picture of it on a breadboard, and try to get the wires nice and neat so we can see how you wire it.

 

[dizmaloner]

Take a clear picture of it on a breadboard, and try to get the wires nice and neat so we can see how you wire it.

The mosfet is laid on the bread board to show position, the top Cooper wire is threaded down to negative post

 

[dizmaloner]

The bridge resistor is in place underneath the board

 

[Zanderist]

Are you using bare copper wire as shown in the picture to build this.

What does the underside look like of this picture?

 

[rhelton]

Isnt that suppose to fire from the negative pole?

Look at your diagram again. The negative from the battery sled runs through the mosfet, to the off/on switch. You have it backwards that would be why its getting hot. Hopefully it didnt cook it.

The photo is a little grainy but it sure looks like its hooked up backwards. Plus side to switch.

 

[dizmaloner]

I don't have a pic currently, but as my eyes see it it matches the schematic

 

[rhelton]

You posted a pic of it. It is wired backwards from what I see in the photo.

 

[dizmaloner]

I tried it both ways, neither functioned

 

[david4500]

You fried it. Toss that mosfet.

 

[dizmaloner]

You posted a pic of it. It is wired backwards from what I see in the photo.

Does it look backwards still?

 

[rhelton]

What mosfet are you using. I cant tell whats going on 100% on your bread board the pic is too grainy.

 

[dizmaloner]

Irlb3034pbf is there a way to post a pic here that is less grainy? The picture was taken with a 12mp camera--should be quite clear. The wire run from the right leg of the mosfet runs under the board and to the negative on the battery. The center post if the 510 runs under the board and cones up and gets soldered to the positive wire that runs from the switch to the positive post of the battery

 

[DaveP]

Irlb3034pbf is there a way to post a pic here that is less grainy? The picture was taken with a 12mp camera--should be quite clear. The wire run from the right leg of the mosfet runs under the board and to the negative on the battery. The center post if the 510 runs under the board and cones up and gets soldered to the positive wire that runs from the switch to the positive post of the battery

It got scaled down to a 24kb image size (317x317 pixels). Right click it and check image info. You could upload it to Photobucket or one of the other photo sites and post a link.

 

[SupplyDaddy]

From what I see and you describe, it's wired properly. The mosfet it's self (or even the switch) could be a dud. Did you solder the wires on the mosfet yet? Could also have overheated it if so.

 

[Visus]

Check you 510 for continuity without a coil it could be a deck short when you screw in.
It should be open