Sub-Ohm Pass-through Devices

[EvilBetty]

I've seen some pictures, but not a lot of build descriptions, or retail devices.

Who uses wall / car powered pass-through devices capable of sub-ohm?

Post your builds!

 

[EvilBetty]

Not a good sign... (cricket sounds)

 

[Rickajho]

IMO it's not a terribly practical design idea. A few people have done it, but the first thing you have to deal with is finding or building a 10 - 30 Amp power supply that is suitable for sub ohm. That alone is a major kludgy piece of hardware right there.

Car "accessory outlets" aren't designed to put out those amp levels. You would be blowing the panel fuse every time you hit a fire button.

 

[EvilBetty]

Well this is what I'm having trouble wrapping my head around. I don't think the power supply needs to be large. I think people are just using what the have or can get their hands on.

Fog machines (I know, I know) work similarly except use a pump and fan instead of suction. And I think they are cranking a little more vapor than what most of us require

Most car 12v outlets are fused for between 10-30A. Most car power inverters pull about 3A, and produce around 300W or more at 120v AC. And these units are small.

I'm surprised more electronics geeks haven't done this.

 

[EvilBetty]

Using this website Power Transfer to a Resistive Load

Using a Sony VTC4's internal resistance of 0.012 Ohm, power of 4.2v, and a .5 Ohm RDA, you get the numbers you would expect for power and loss, and safety.

Maybe I should just be looking at using a DNA chip with a fixed power supply.

 

[EvilBetty]

Ok found one, but it's OOS and too pricey.

*NEW* Zorro 3-6v 10A/50W Passthrough

Uses that OKR-T10. That's 10A and 50W

So a box, a power supply, an OKR-T10, 200ohm pot switch, some resistors and caps, a switch, and a mini voltmeter. And you have a manual plug-in VV 50W passthrough.

Going to have to look into this some more.

 

[duroSIG556R]

I'm still trying to get a hold of one. They seem to be always out of stock as few are offering these devices. Very practical for at home vaping.

 

[bobertson]

I made a vape station that sits next to my chair with one of these. It works well.

12V 20A 240W Switch Switching Power Supply Driver for LED Strip Light 110V 220V | eBay

 

[chefjoosie]

The setup I use at my desk is:

I mounted on my desk 4 rca jacks. I connected 3 of them to the 5V rail and 1 to the 3.3v rail of an atx power supply. (you could use any number of jacks connected to whichever voltage you want)

I then made 4 pass throughs. 3 super cheap ones made from 10 cent breakproof test tubes, 510 to ego adapters, a push button switch, and 4 feet of wire with an rca connector on the end. And 1 variable watt box for the 3.3v jack. I painted them all and epoxy coated them , and they work great. I clip them to my desk with tool hanger clips.

As far as which power supplies to use, relatively older atx power supplies tend to be better than brand new ones. Both for price, and because newer supplies have shifted the majority of the capacity off of the 3.3 and 5v rails and onto the 12v.

 

[_MAD_]

@bobertson\chefjoosie... do you guys have pictures and\or schematics of these setups? I had contemplated building one of these type of devices back when I was wiring up my arcade cabinet but never found anything that would be sub-ohm safe and capable.

Now it has kind of gone back to the top of my 'I want' list...