5V mod attempt with a low amperage tatcile switch

[Doctor_Code]

I am new, and can not post this anywhere other than here - I realize this should be placed under 'mods'

I had a bunch of transformers that I do not know what they belong to, and found one that had a nice and convenient 5.1V .7A output.

I normally use momentary switches for most of my mods, the kind I can send full voltage/current to (the problem I have with those is they tend to fail after a short period of use, and I end up having to press them in a direction other than straight down for them to work). This is my first time using a tactile switch/transistor combo.

The resistor is a 1K Ohm resistor, the transistor is a NPN type switching transistor from Radio Shack (PN 276-1617). From left to right the pin-out is collector, base, emitter. The switch is rated at 50mA and 12V.

When I press the switch, my multimeter reads 5.1V. When I let go it takes a few seconds to go back down to 0V. However, with the atty attached I get no vapor or other signs that it is working.

Any help as to where my failure in logic/design is would be greatly appreciated. I have attached a picture of my setup.

 

[varalMCheelflip]

never hurd of using a transformer? and besides that I cant really fallow you, your best bet is to boost your post count and get this over in the modders section. There you will find plenty of people that are more than willing to lend a helping hand.

 

[Doctor_Code]

Yeah, that was my hopes. I need to post a bunch before that happens. I frequent the mods section often, in silence

As to the transformer - that is what is on the other side of the thicker black cable. I had chosen one of about the right voltage and amperage. I am having troubles with the using a transistor for a switch.

 

[derek88]

If I remember correctly you need at least 1.5 amps to fire the atty so .7 isnt really going to cut it

 

[Doctor_Code]

Yes, that seems to be my fatal error in logic. My 'big' TrustFire batteries were rated at 900mAh and the ones that come with my Yeti are rated at about 320mAh. When I came across the 700mA transformer, I was thinking that would be a happy medium.

Not even thinking that mA and mAh are not at all related. I re-found this thread titled 'Difference Between 5V PV and 3.7 with LR Atty' (I tried to post the link, but do not have enough posts). A normal 510 atty will draw about 1.61A and a low resistance atty will draw about 2.47A.

That is far lower than the output of my transformer. This is actually good news. My goal is to make a 5V mod using a voltage regulator and two of my 14500 TrustFire batteries rated at 900mAh 3.7V.

I will try my setup with the batteries and see what mileage I get.