DIY ohm reader help.

[disturbed1]

I want to build my own OHM reader with a little wood box. I have every thing to do it. Fatdaddy 510,led display and switch. My question is. If I use a 18350 to power it do I need a mosfet?

 

[drmarble]

The current used should be very low so a mosfet is probably unnecessary. If your switch can handle half an amp (500 mamps) it should be fine. It doesn't take much current to check resistance. It just takes high currents to fire the coil.

 

[disturbed1]

The current used should be very low so a mosfet is probably unnecessary. If your switch can handle half an amp (500 mamps) it should be fine. It doesn't take much current to check resistance. It just takes high currents to fire the coil.

the switches I have are 2 and 4 amp. So I should be fine?

 

[Davantrac]

Maybe use a pair of triple aaa batteries like the shop bought ohm reader?
I'm doing roughly the same as you using the guts out of a shop bought one, what sort of ohm reader did you get and where from?

 

[Sonar505]

Not sure if this is what you are looking to make. So hope this helps. I made this 2 years ago. Got the bare meter board from madvapes built a wood box and put a momentary switch on it (so I would not accidentally leave it on) Installed 2 rechargeable AAA batteries. Just recharge them every few months and works great for me. I do not remember seeing any that require 4.2 volts to operate the led?

 

[Davantrac]

That's what I'm doing spot on. I've always had trouble finding the board though. Will check them out now.

Just checked, I couldn't find them.

 

[disturbed1]

Not sure if this is what you are looking to make. So hope this helps. I made this 2 years ago. Got the bare meter board from madvapes built a wood box and put a momentary switch on it (so I would not accidentally leave it on) Installed 2 rechargeable AAA batteries. Just recharge them every few months and works great for me. I do not remember seeing any that require 4.2 volts to operate the led?

That's what I want to do to a T. Do you have a wire diagram ?

 

[Sonar505]

If you can get the board its very simple to wire up. 4 connections labeled Pwr + and - . also DUT + and -. So you go Battery + thru switch ---> to Pwr + , Battery - to Pwr -.
DUT + to 510 center pin, and DUT - To 510 -

 

[Davantrac]

Any idea where to get the board? Have you got a model number or any identification of it?

 

[disturbed1]

I got my led display off eBay. It's like the one you would put in a mod.

 

[Davantrac]

I can find volt meter boards but not ohm meter boards. Or is that my lack of electronics knowledge letting me down?

 

[cooper99]

Any idea where to get the board? Have you got a model number or any identification of it?

Would this be what you're looking for?
Do-It-Yourself

 

[Davantrac]

Wow that's the thing, but I can get a working meter from china for $6 and just strip the board out of them. Was hoping to find just the boards a bit cheaper.
Thanks anyway.