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For an N-channel switch, you need a "pull down " resistor on the gate. Pull down only means the resistor connects the gate to ground. For a P-channel switch, you need a "pull up" resistor that connects the gate to input voltage. This resistor is always necessary for a power switch and good values range from 4.7K to 47K Ohms. 10K is a typical value.
Does this work for the mosfet with a tact switch?
This is how it should be wired. Note the part numbers
Got a couple of irl3103 should i just remove the tact switch and follow the diagram if i want to use it as a touch sensor switch? Or i have to wire it differently?
Same wiring. Just bump up the resistor between G and S. Start at 1M. I have gone as high as 100M ohm.
sorry i can't start new thread...Iam searching for a fuse smd are these ok ? http://www.ebay.com/itm/10Pcs-Littelfuse-SMD-0603-5A-5-Amp-Fast-Fuse-467-0467005-NRHF-/221010323199?pt=LH_DefaultDomain_0&hash=item33753de6ffwhich ressetable fuse has the lower resistance ?Also iam searching for a current sensor smd , a charge pump for high side n-mosfet switch and an inductor smd for step circuit do you know something good ?What extra hardware except from an mcu i need to drived an oled like this ?http://us112401600.trustpass.alibaba.com/product/120752718-103326398/Santek_0_69_OLED.htmlfor n-mosfet i want something to step the gate voltage higher that drain voltage to use n-mosfet as high side switchthanks.
i am searching for a current sensor
I can't help you much with a charge pump. I always use MOSFETs with low enough VGS(th) that I don't need to use one. It's kind of an archaic way to go with the wide range of logic level P-channel MOSFETs now. In any case, you should be able to find one that suits your needs. It's a pretty standard part.
The only MOSFET I could get locally has negative voltage values on the data sheet. Would the switch work with a NPN 3904 transistor instead of the MOSFET? Or is 2.5 amps (my max vaping amperage) too much for the transistor.
The mosfet the guy at the electronics store recommended is the IRFU9110, data sheet here http://html.alldatasheet.com/html-pdf/181384/IRF/IRFU9110PBF/58/1/IRFU9110PBF.html VGSth min -2.0. I am a little confused with the negative values on the sheet, all the other ones I looked at had positive values. Looking at the diagram from earlier posts, the resistor goes from gate to source? Thanks for all the help.
Ok I have a strange one today. I went to wire in a STD30PF03LT4 & tact switch into a 3.7mod and its always firing. No biggie grabbed another one from the tape and same thing?!?! After 5 of them I'm baffled. I have used some from the same tape and they worked fine. Wired exactly as break's post earlier. Any ideas what could be causing this?
This may sound stupid but are you using a N/O tact sw?Another thing... did you try it with a load (atty)Are you powering a PTN04050c with it and breaking the positive to board.I know that you said you have done this before with this Mosfet but did you double check your wiring?
when using a tactile switch as the power switch on a 04050 chip, is it essential to use a mosfet, or can you get away with out using one at all?
Look at the amperage rating on the tact switch and then look at the amperage of the 04050 input... This should answer your question
thanks, found it, i guess i will have to use a mosfet with the tactile switch.