Nothing is more frustrating than building a new mod, only to find out after you do all the soldering, drilling, clipping, etc ... that it doesn't work for some reason. For this reason I always 'Breadboard' a circuit and test it before I begin the assembly process.
I use Prototyping Breadboards for all my projects and thoroughly test the design before I ever plug in the old soldering iron or clip a single lead. That way, if it isn't a good design, I can modify values or change wiring or just disassemble the circuit without wasting components. Breadboards are really cool. You merely plug each of your components into the board, add a few jumpers, and you have a fully-functioning circuit you can try out.
Here's a closeup of a breadboard:
Here's a picture of me vaping my latest design. I am trying out a different MOSFET and needed to be sure it would work at 3.7 volts. I assembled the test circuit, added a battery and a carto with a 20" wire for the test. It turns out that it works great!
I know to many modders this is a given, but thought some of you newbies would find this a good tip.

I use Prototyping Breadboards for all my projects and thoroughly test the design before I ever plug in the old soldering iron or clip a single lead. That way, if it isn't a good design, I can modify values or change wiring or just disassemble the circuit without wasting components. Breadboards are really cool. You merely plug each of your components into the board, add a few jumpers, and you have a fully-functioning circuit you can try out.
Here's a closeup of a breadboard:

Here's a picture of me vaping my latest design. I am trying out a different MOSFET and needed to be sure it would work at 3.7 volts. I assembled the test circuit, added a battery and a carto with a 20" wire for the test. It turns out that it works great!

I know to many modders this is a given, but thought some of you newbies would find this a good tip.