Variable passthru Mod ?

[Java_Az]

Sorry if there is something in here about it but my searches have come up with nothing.

Basicly what i want to do is make a variable voltage box that hooks to a usb hub. Then plug my straght threw USB passthru to the mod. would like it to go from 3.3 or 3.5 to 5.37 volts. i say 5.37 volts because thats the output of my usb hub. It is also a 2 amp hub. really could be 5 volts if thats easyer. So basically my main question is what pot would i have to use for this and maybe a resistor. So if we have any electrical engineers reading your input and help would be greatly appreciated. Thanks

 

[Bubo]

What's the matter with this one? The EverCool Variable Voltage Mod?
You'd just be swapping out the batteries for the USB cable.... Right?

 

[Scubabatdan]

What's the matter with this one? The EverCool Variable Voltage Mod?
You'd just be swapping out the batteries for the USB cable.... Right?

Correct! and don't forget the pretty LED voltage readout!!!
Dan

 

[Java_Az]

That would work. But do i really need to regulate the voltage since my supply voltage is already at 5 volts and not 7.4 with the batteries. I am no expert on this but i was thinking that part could be left out

 

[Java_Az]

Was just digging threw my stuff i have a 3006p trimmer sitting here if that helps. Wouldn't i just have to slap a resistor between that and the power source. It is pretty much the same as the 3296 trimmer in that mod you posted but the 3006p rated at 3/4 of a watt compared to the 1/2 a watt for the 3296.

 

[Bubo]

I don't know about trimmers and such (I leave that to others, I just copy what they do!) but I have successfully made straight USB passthroughs with a normal 510 atty that worked just fine...

What are you trying to vary the voltage to?

 

[bornagainst]

Not sure why folks would want something that complicated.

My Fistpack is multivoltage, and I can use it as a passthru as well. The Tekkmod is the same.

Problem solved.

 

[Java_Az]

I don't know about trimmers and such (I leave that to others, I just copy what they do!) but I have successfully made straight USB passthroughs with a normal 510 atty that worked just fine...

What are you trying to vary the voltage to?

I already have made a straight passthru it works fine. But am am stuck at 5 volts with it. Just want to beable to dial it to what ever i want from 3.5 to 5 volts for some verity. I for sure dont like running my LR atties @ 5 volts but my regulars seem ok there maybe even a little less 4.7 or maybe even lower.

 

[Java_Az]

Not sure why folks would want something that complicated.

My Fistpack is multivoltage, and I can use it as a passthru as well. The Tekkmod is the same.

Problem solved.

Basically i was thinking i could just slap this together really quick today with maybe needing a 99 cent resistor. I wasnt looking to spend 200 for a fistpack or 120 for a Tekmod. Although thats put together i guess you could save some bucks by buying a do it yourself kit. Really what i am trying to do is pretty easy and not complicated at all.

 

[duby]

Though I'm not too familiar with the chip, I'm fairly certain that the evercool uses a step-down regulator who's max output voltage is Vin-0.4V or something similar.

Simply put it won't be able to provide higher than your input voltage, and in many cases the max voltage is a little less than your input.
So it would work fine if 5V is your max desired.
With that said the evercool specs should work find fine if you just replace the input.

The Fistpack uses a booster with a 3.7V input. Assuming the booster will take a 5V input you should be able to wire something similarly as a passthrough.

If you ask nicely I'm sure Bigblue will be happy to help you a bit on a new version of his design.

If the pot you have is a similar as you have described, it should work fine as a replacement for the one Blue used.

If you want a very simple circuit with just a pot and a switch, you'll need a very low resistance ranged pot. Something with a range of 0 to 2 ohms. It will also need to be rated for your power draw. Often the tiny ones aren't.

 

[misterD]

http://www.e-cigarette-forum.com/forum/battery-mods/110105-adjustable-voltage-power-pack-soon.html

 

[Java_Az]

http://www.e-cigarette-forum.com/forum/battery-mods/110105-adjustable-voltage-power-pack-soon.html

Thanks thats awesome what i really wanted to do in the long run with a led voltage readout. This is even better with a amp meter too. Price is great too. Thanks again

 

[misterD]

Thanks thats awesome what i really wanted to do in the long run with a led voltage readout. This is even better with a amp meter too. Price is great too. Thanks again

there's a coupon code somewhere to bring the price even lower

 

[Java_Az]

Yeah thanks , i found a 15% off code the free shipping wouldnt work because it is not over 25 bucks, But still a nice deal no way i could build something like that for the price. 6 to 30 volts input i will just pig tail off my 850 watt Computer PSU with 12 volts plug my straight thru into the usb port and be vaping at what ever voltage i want. Might even work up a portable battery pack and go semi portable with it.

 

[misterD]

HOLIDAY was the coupon code! too late now?

 

[Java_Az]

HOLIDAY was the coupon code! too late now?

for sure too late ordered it a good 6 or 7 hours ago. Plus i am too drunk now to spell hollyday

 

[WillyB]

Sorry if there is something in here about it but my searches have come up with nothing.

Basicly what i want to do is make a variable voltage box that hooks to a usb hub. Then plug my straght threw USB passthru to the mod. would like it to go from 3.3 or 3.5 to 5.37 volts. i say 5.37 volts because thats the output of my usb hub. It is also a 2 amp hub.

The output of your hub without a load attached is basically meaningless. You say it's 2 amps. With USB connections you are probably getting about 1.9A (tops) to your atty. You didn't mention your atty, but 1.9A will drive a Joye 510 at about 4.1V while vaping.

I already have made a straight passthru it works fine. But am am stuck at 5 volts with it. Just want to beable to dial it to what ever i want from 3.5 to 5 volts for some verity. I for sure dont like running my LR atties @ 5 volts but my regulars seem ok there maybe even a little less 4.7 or maybe even lower.

Again if your LR atty is 1.5Ω your 2A hub will drive it to maybe 3V. Certainly no where near 5V.

 

[Java_Az]

Didn't think Fedex Delivered on Saturdays but that's what tracking has for a delivery date. You can pretty much consider this Thread Solved. As i got this thing Rechargeable Batteries & Battery Chargers - Tenergy Universal DC-DC Converter and Voltage Stablizer--Any Voltage Control, New! coming via fed ex. Couldnt pass it up for 20 bucks. Digital amp readout even no drop under load. Thanks for everyone's help i appreciate it