I want to make one, is there any mosfets rat shack carries that will work???? and schematics??? what about this: MOSFET IRF510 Transistor - RadioShack.com
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madvapes sells 2 or 3 that look a lot like that. The one I got is a voltage regulator to regulate to 5 volts. Not sure if this is helping you or not, as you said switch, but that looks like a transistor.
From what I can recall, you can't use the IRF 510's on a single 3.7v battery because of the requirements of the gate voltage. It should be fine if your using it with a 5v regulator.
I've been trying to get some help on 1 spot touch 'capacity' switches for a while now. It seems no one is able to provide the info needed to make these.
It's a pity because there are several tiny, cheap IC's on the market which would make excellent switches. I bought one for only £2 and it's just sitting here because I can't find any (non-techy) details on wiring it up and putting it together in an e-cig battery box.
Slopes, have you seen TuEr0s' touch switch as yet. It's a piece of solid wire surrounded my an insulator, wired to the Mosfet:
Slopes, have you seen TuEr0s' touch switch as yet. It's a piece of solid wire surrounded my an insulator, wired to the Mosfet:
The trick with such a switch is the conductive body. For a touch switch, you need two contact points. In the case of a single point, like in that photo, the body is the second contact. Your finger will touch the body and the other contact to turn the unit on. For a non-tube mod, or any mod where the body isn't the path for the negative, you could use a similar setup, but you'd need a second ring. If you look at the bottom of a 510 atty, it's a perfect example of something you could use. It has a center contact surrounded by an insulating o-ring and then an outer contact. That would make a perfect "single-finger" touch switch.
For a wiring diagram, there is a thread around here somewhere about exactly that. I'd link it, but I'm at work and don't have the link here. In fact, just a week or so ago, I had almost the same discussion and linked the same thread for the same purpose. Maybe check back a couple pages on this forum and see if you find a similar title.
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Thanks guys, but this isn't the type of touch switch I have in mind (and I've seen Raidy's post on this set-up). The one I have been looking at only requires a single surface to touch - and the active area can even be mounted below a plastic surface (eg a battery box). It doesn't require two metal points to be connected by a finger in order to switch on.
Perhaps you can show an example of such a switch? I'm afraid I don't know what you're talking about, but it sounds worth some looking-into.
You may be referring to a capacitive switch as in a touch switch on a lamp. These are however touch on and touch off.
Touch switch - Wikipedia, the free encyclopedia
Touch switch - Wikipedia, the free encyclopedia
I think microchip has ICs for this also. The circuit is more complex than a 2 pole resistance touch switch. I believe many of the remote controls these days use them rather than button micro-switches. It would take some doing to tear one apart tho, and find the controller and figure it all out....... better to find an IC for it.
http://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=1824&appnote=en531257
EDIT: oops... sry for the dupe perlionsmitnick. There are links to circuits at the end of the article.
I think microchip has ICs for this also. The circuit is more complex than a 2 pole resistance touch switch. I believe many of the remote controls these days use them rather than button micro-switches. It would take some doing to tear one apart tho, and find the controller and figure it all out....... better to find an IC for it.
http://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=1824&appnote=en531257
EDIT: oops... sry for the dupe perlionsmitnick. There are links to circuits at the end of the article.
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The touch switch IC I bought is here. Note that it shows 2 independent touch switches in one chip and a single switch only can be configured (appropriate for an ecig device). It gives the pin connection details for momentary functioning (which I take to mean: touch=on, no touch=off). It also states that a 1m resistor is the only other part required to use the switch (someone on ECF has said that a mosfet will also be required... although I'm not sure if this is necessary for this type of 'single sensor' capacitive switch).
A similar IC (Qprox IC- QT113G) with the same single sensor functionality is shown here in a DIY circuit someone has built. There is also an IC called the 555 which I believe operates in the same way.
It would be good if a community on ECF could run a thread making a simple circuit for these chips to be used in battery boxes (and illustrated for non-techincal people like me). I think this type of touch switch is far superior to the two-points version.
A similar IC (Qprox IC- QT113G) with the same single sensor functionality is shown here in a DIY circuit someone has built. There is also an IC called the 555 which I believe operates in the same way.
It would be good if a community on ECF could run a thread making a simple circuit for these chips to be used in battery boxes (and illustrated for non-techincal people like me). I think this type of touch switch is far superior to the two-points version.
There are hundreds of posts on these forums going back almost 2 years concerning mosfet based touch switches.
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