why are those spiders in my passthrough

[newboy]

Hey all,

received a pass-through for a KR808D-1. Defective on arrival. Wasn't worth the hassle to return it.

Thought the switch was bad, so took it apart to replace switch. It's just a pass-through, 5V in from the USB connector, a simple NO switch to the cartomizer, 5V out to the cartomizer, or so I thought.

BUT NO, it wasn't just a switch. There is a small pcb with surface mount resistors, and spiders (multi-legged black boxes)!

Got any idea what they are doing here? What was wrong with just having a switch?

Inquiring minds want to know!!

 

[Prodigal441]

I will guess that it is a regulator. This is common in many pass-throughs that I have seen and opened out of curiosity. Keep in mind that I could also be wrong. Without seeing yours, that would be my educated guess.

 

[newboy]

Thank you,

the output is 5.0V same as the input.

I was thinking possibly some type of relay (MOSFET or the like?).

a lot more complicated than I thought, anyway.

 

[AttyPops]

MOSFET.... at least, yes. Probably some other circuitry too (can't tell from the description, haven't torn one apart). The MOSFET allows them to use the small low-amp button. Other chips may monitor for shorts, monitor voltage, apply cut-offs, some are resistors for the LED, etc. .... who knows what they stuff on those PCBs these days. Prolly varies by manufacturer too.

P.S. Spiders....I like that. lol.

 

[newboy]

thanks, guys.

I had thought I would make my own passthroughs, if all I needed was a tube and a micro-switch. After taking that one apart, $14 seems really cheap.

 

[AttyPops]

For a 5v direct-PT, all you need is a tube, atty-connector, and 3 amp switch (rather than micro switch) optionally an LED/resistor. If you want a micro switch, use a MOSFET circuit. Still not too bad. Most people start by using a BAB (Big A.. Button)...lol. The purchased 5v PTs often die after a couple of months..... IMHO. But you are correct, $14.00 isn't too bad for even a couple of months of 5v vaping. Many of us like to mod just for fun.

Now, if you are thinking about 3.x battery backed PTs... buy those, or build a nico-stick and get 3.7 volts.

Good Luck!

 

[WillyB]

Now, if you are thinking about 3.x battery backed PTs... buy those,

HUH? What exactly are you talking about?

 

[AttyPops]

HUH? What exactly are you talking about?

S/B 3.x volt battery backed PTs... you know, the ones with the inline battery that are recharged via usb... you buy em. Depends on what the OP wants... 3.x v or 5 v. Post #6 was just discussing different PTs. And encouraging the OP to build a simple 5 v and not get too hung up on the circuitry that he saw when he tore his apart.