Reddit reviews ZJchao AC 100-240V Adapter Power Supply - DC 21V 2A 5.5mm Lithium-ion Battery Charger US Plug

You could use a switch like this inside the pantry: LINK

to turn on a small light. I'm not sure about the code as far as running line voltage inside a cabinet (I think it's prohibited), but I'm pretty sure you can run 12VDC inside a cabinet.

Something like this (LINK) is plenty powerful enough to run a 12V led light.

Here goes:

Parts list:

Fan- http://www.amazon.com/Cooler-Master-SickleFlow-120-Radiators/dp/B0026ZPFCK/ref=sr_1_1?ie=UTF8&qid=1395795979&sr=8-1&keywords=120mm+fan

Grill-http://www.amazon.com/Rosewill-RFG-120-120mm-Grill-Cooling/dp/B0057JFO9Q/ref=sr_1_4?ie=UTF8&qid=1395796001&sr=8-4&keywords=120mm+fan+grill

Power supply-http://www.amazon.com/Wall-Adapter-Power-Supply-12VDC/dp/B006GEPUYA/ref=sr_1_5?ie=UTF8&qid=1395796047&sr=8-5&keywords=12v+power+supply

Speed controller (optional)-http://www.amazon.com/Manual-Variable-Speed-controller-connector/dp/B002D3DK1I/ref=sr_1_2?ie=UTF8&qid=1395796082&sr=8-2&keywords=12v+fan+controller

Parts Notes:
You can get any 120mm fan locally (or any of these parts), this one isn't special. Make sure to note that its 12v DC and take note the amerage. This is imporant in sizing your power supply and/or speed controller. You may have a 12v DC wall charger to an old something or other laying around. As long as it is 12v DC and is around 1A, you should be all set. 0.7A, fine. 2.5A, fine... etc

Installation- I would put the fan inside the box exhausting upwards so the top of your box stays flush. You could put it on top of the box and have it pulling air out should you wish. The grill is optional to protect stuff from falling in and your fingers. Installation should be straight forward. Use small wood screws to mount both the fan and the grill. Pre-drill depending on wood type and screw size.

Powering it up- If you don't have a volt meter, take note of the positive and negative ends of everything before you cut any wires off. Label them clearly. If the fan has a 4 pin molex connector note the red and black pins. Plug them into the corresponding Load/Device side pins from your speed controller. Cut (or _____) and connect the positive lead from your wall plug to the red wire of the line side of the speed controller. Connect the negative to the black wire. Check your connections, then plug in the wall pack. Your speed control should now be controlling your fan.

To make the fan simply run at full load, connect the positive to the red of the fan, negative to the black of the fan to omit the speed controller.

All of these parts can be found at Frys / Radio Shack / local electronics or computer store.

Written at a (6). Sorry if unclear, just send a message.

Most 12V fans won't even start up on 5V, and that's not even counting the dropout voltage from the LM317.

Have you considered just getting a 12V wall wart?

I doubt the poor Uno is able to deliver the amps required to run your transmitter. You should try using a separate power source (12V 1+ Amp Wall Wart like this) to power it.

Oh, so something like this? and this ?

Ok, if runs on AA batteries, the step-down converter I linked, powered by a 12V 1A wall transformer like this one will definitely work. No additional components needed, just adjust the output voltage of the step-down converter before connecting it to your device.

Side note: you mention the device 'essentially short circuiting', but for a heating element to be effective, it must have significantly higher resistance than the elements in series with it, in this case the battery and wires. I would bet that the heating element has a measurable resistance in the range of 1-5 ohms, measured while hot.

Also, it's pretty obvious you're modding a vaporizer, no need to be so evasive about it.

I dont know why you would get any other type of fan. Computer fans are meant to be run continuously and are virtually silent. just get a 140mm pc fan, and a wall plug with 12 volt 1 amp output and just splice the wires together. With 1 amp you should be able to run two fans in a parallel configuration no problem.


power supply

Fan i use this fan. its quiet and moves a decent amount of air. i only use one since i have no carbon filter. so if you want one you may need two fans in a push pull configuration

Something like this, maybe?

I'm not entirely sure if the plug would fit.

Let me preface this by saying that I'm not an expert. But if you want this to run continuously, you'll want a DC power supply, maybe something like this instead. The batteries will lose charge over time, meaning the fan will run slower and eventually stop. Also, your fan pulls about 1 Amp, meaning that the internal resistance (?) of the batteries and the fan may mean that you won't be able to run it at all (the required current would be greater than the maximum current available from the batteries). But yes, to answer your question about hooking up, if you connected the red wire to the positive terminal of a 12 volt battery and the black wire to the negative, it would run, assuming it could supply enough amperage to make it run. If you bought something like the power supply I linked, you can just cut the end off of it and wire up the positive wire to the red wire of the fan and the negative wire to the black wire of the fan.

Something like this

If you're like me, you have about a dozen lying around. Usually the positive wire will have a stripe or dashes printed on it. The best bet would be to test to determine. In this case, if you have it backwards, it probably just wouldn't work.