What size switch would handle two 18650 unregulated box mod??
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The size of the switch is determined by the amount of current. So it's impossible to answer without knowing what your target coil resistance is (and whether you intend to use the batts in series or parallel).
So if I wanted to build a parralel 18650 using sony vtc3 or 4 or any other 30 amp battery. What switch would be needed for going down to .25 ohms? I know its about 17A there but I cant seem to find a switch small enough to fit inside of a mint tin (simmilar to an altoids tin but a but slightly smaller).
If you want to go that low in ohms your going to need a mosfet on your switch. There aren't many/any switches that small that will handle 17A without some help.
I use a normal 3a/250vDC switch I got on ebay on all of my boxes, have yet to blow one. I do run crazy low resistance on a regular basis, and I chain vape for hours at a time. So, don't you worry. A 3a/250vDC switch is fine.
Invalid Request
This switch can handle 21 amps at 8 volt DC and should be able to handle more amps at 4.2 volts. I am going to try one in a unregulated box mod with two 18650 batteries in parallel. It is only a little over 10mm wide. This is the best switch I have been able to find during a two week search online that will fit in the design I am going to built.
The link above goes to the listing for this switch. I do not know why it says Invalid Request.
This switch can handle 21 amps at 8 volt DC and should be able to handle more amps at 4.2 volts. I am going to try one in a unregulated box mod with two 18650 batteries in parallel. It is only a little over 10mm wide. This is the best switch I have been able to find during a two week search online that will fit in the design I am going to built.
The link above goes to the listing for this switch. I do not know why it says Invalid Request.
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I never would have thought to use a snap-action switch. Nice idea. Not sure you can use the one you linked to as it is SPDT-NC and for our application we usually use SPST-NO switches. I did find this one that meets those standards..
Invalid Request
Invalid Request
The switch I linked is NC, however it has three terminals(Com, NO and NC) and is DT. I will not use the NC terminal, I will only use the Com and the NO terminals. That way when the button is pressed the circuit will be completed between the Com and the NO and power will flow to the atomizer. The switch you linked is rated at 16 amps at 8 volts DC. They make the switch you linked in 21 amps, but Digikey does not have them in stock. That is the switch I was going to get if it had been available.
I think these switches will work great in an unregulated box mod and they take up very little space. As cheap as they are I am going to order a few of them so if they have a somewhat limited life I can replace with a new one.
A mechanical switch that will handle 20A will wear your finger out. I highly suggest making a circuit with a fet transistor that is rated for about 50A.
Where could I find info on a fet transistor and a circuit like you are suggesting? I would love to use something like that in my unregulated box mod.
Typically I go to digikey or mouser and do a search for a good fet. You find a good one and look at the datasheet and make a circuit on some copper clad pcb bread board. Do some searches on these things and you find what you need. One tip though. Go with a newer part, they create much less heat than older part #s. Learn to use SMT parts. They save LOTS of space.
The big chip here is an example of a surface mounted fet, but follow datasheet instructions.
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Here is another of the same ST fets on a tiny board controlling power to a bunch of other stuff.
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The big chip here is an example of a surface mounted fet, but follow datasheet instructions.
Here is another of the same ST fets on a tiny board controlling power to a bunch of other stuff.
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