Combine Touch switch with Booster

[Dalton63841]

I had the same problem with the PTN08100w. The mosfet was always on and when touched, got a small voltage.
Now take into consideration that I am old and my memory is shot (teen from the sixties)... This was a week ago mind you,
I had two problems to solve last week and I maybe confusing the two so here goes,
1) I couldn't turn the touch on with the 10m so I went right to the 100m. Never tried anything between the 2 sizes.
2) The PTN08100w would not work with the N-Channel. Breaking the negative feed was not successful. It was always powered on.

Well from what I have gathered, the ptn04050C is a full circuit all by itself, so I think it is gonna need a p channel mosfet. I have attempted just about every possible configuration with these n-channels, but I will get my hands on a p-channel and give it another go.

 

[breaktru]

Now looking at my schematic, I believe if all the negative wires were broken thru the Mosfet, it would work. And no back feed is possible? Of course you can do that with a box mod and hard if it's a metal tube mod.

 

[breaktru]

I'm sure others have built a touch with the booster, where are these guys?

 

[Dalton63841]

Now looking at my schematic, I believe if all the negative wires were broken thru the Mosfet, it would work. And no back feed is possible? Of course you can do that with a box mod and hard if it's a metal tube mod.

Haha I know what you mean. It doesn't make any sense at all. I have tested and retested, checked and triple checked everything, but the booster is getting a ground somehow.

 

[asnider123]

I can tell you, with MV's 4-lead 5v reg, I once tried using the neg lead as control (because I busted off the control pin) .. it turned out that Vin and Vout were the same with NO GROUND connected. Acted like a dead short between in and out ??? Made no sense to me, but that's what happened. Maybe the module requires GND to act properly ??? Again, just another uneducated guess.

 

[asnider123]

Haha I know what you mean. It doesn't make any sense at all. I have tested and retested, checked and triple checked everything, but the booster is getting a ground somehow.

Do you live real close to an AM radio station by any chance? I used to work at a place that had so much RF in the air, you could hook a coil (like an atty) to a voltmeter and actually get a reading. Come to think about it, perhaps it effected my brain too

Or maybe it's poltergeists ??? LOL

 

[Dalton63841]

Haha no nothing like that around here. For now I am at a stalemate. The IRL3103 is not epoxied into a box mod for my girlfriend. Think next up I will get my hands on a p channel and go again.

On a positive note, it appears that 30M resistor is perfect. No matter how dry or moist my finger is, it fires every single time without fail.

 

[asnider123]

My grampa could pick up CB radio in his fillings. Thought he was hearing angels that said "10-4" he took it to mean Matthew 10 verse 4 LOL

 

[perlionsmitnick]

I'm sure others have built a touch with the booster, where are these guys?

I tried this a while back with the ptn4050 and n channel. From my vague memory it kept burning off the drain wire off of the mosfet. I quit with that project.

 

[Dalton63841]

I tried this a while back with the ptn4050 and n channel. From my vague memory it kept burning off the drain wire off of the mosfet. I quit with that project.

I didn't run into that issue. For me it's like the ptn04050C is finding a ground to complete the circuit, even when the touch switch isn't touched. For now the project is parked till I get some more parts, but I will get it.

 

[breaktru]

I didn't run into that issue. For me it's like the ptn04050C is finding a ground to complete the circuit, even when the touch switch isn't touched. For now the project is parked till I get some more parts, but I will get it.

I had explained that issue 3 weeks ago with the 08100w at: N-Channel Mosfet and Reg

 

[Dalton63841]

I had explained that issue 3 weeks ago with the 08100w at: N-Channel Mosfet and Reg

Haha I actually hadn't read that, but it's exactly what I thought. Will have to get my hands on a p channel FET and try again. It's been a long time since I've worked with electronics like this beyond building PC's, but I forgot how much fun this is.

 

[TomCatt]

Any news on this Dalton?

 

[Dalton63841]

Any news on this Dalton?

Absolute No-Go with an N-channel mosfet. I still have to find a proper P-channel.

 

[asnider123]

There is absolutely no reason why Breaktru's circuit wouldn't work with an N-Channel MOSFET. Just use it to switch the neg batt instead of the pos ..

 

[asnider123]

Absolute No-Go with an N-channel mosfet. I still have to find a proper P-channel.

Why not? The only thing you need to do is interrupt either the pos or neg battery. I make touchmods all the time. On metal cases you need to run them as pos ground, but other than that, I don't understand the problem ???

 

[Dalton63841]

With the PTN04050C, if you use an N-channel, it still passes current through. Don't ask me how, but when you use an n-channel, it gets 5v when you touch the touch switch, but when you don't it is still feeding the basic 3.7v(or whatever the batteries charge is) through.

I have redone the circuit a dozen different ways, but the only thing I can figure out to work is to have the touch switch between the booster and the load, but if I understand correctly, the booster would still be using power even when the switch isn't activated.

 

[TomCatt]

Maybe ask CraigHB about this? Or is it possible to ask TI?

 

[Java_Az]

Is the 3.7 volts firing the atty or is it just a voltage meter measurement. I would be more concerned with amps. It is drawing any? If the atomizer is firing then it would be. But voltage doesn't mean much unless there are some amps to go with it. Other then that Inductors can create a AC current which might explain what it happening. Here is a Pchannel that would work with a single battery FDS637 for a touch switch. I would try it with a 4.7Mohm resistor from gate to source.

 

[Dalton63841]

Maybe ask CraigHB about this? Or is it possible to ask TI?

breaktru can explain it much better than I can. The PTR08100 switching reg is the same way.