Building a Cheap, Heavy Duty Passthrough

[BillyBlack]

Originally Posted by mcquinn

I was figuring a 2.5 ohm 10 watt resister should drop the voltage on a 510 @ 5volts to 4 volts.The only use I thought of for diodes was to keep electrons from going backwards as in current rctification.I didn't make it far in electronics class too many laws and formulas.

Alright I checked with some experts on your resistor. A 2.5 ohm resistor would be like trying to run 2 atties, you'd pretty much be cutting your volts/watts in half.


My question. At first I thought a 1 ohm would do it till I dug deeper.

If I may ask a couple more questions.

5V and a 2.3 ohm Joye = 10.9W

Now if I added a 1 ohm resister to the mix (in series) would it be:

5V and 3.3 ohms = 7.6W?

And seeing as only 70% of the ohm load is the atty does that mean the atty itself will now be 5.3W?

In a series circuit you have it right , the voltages and powers divide. 30% to the res. and 70% to the atty 2.3 watts are disapated across the res. and 5.3 across the atty, a .5 ohm res. would be a better solution 8.9 WATTS total , or 18% across the res. for 1.6 watts and 7.3 watts across the atty.

Using the formula: E = Square Root of (P x R). 7.3W is the equivalent of a 2.3 ohm atty at 4.1V.

From looking at the watts the resister is dissipating, 1.6W, a 1 ohm 5W resister would be more than enough.

[mcquinn]

Thanks,I get all google eyed after a few minutes of algebra.So I became a HVAC tech instead .

[mcquinn]

Here is the 411 on the resistor thing.I went out to Radio Shack and bought a 0.47 ohm 5 watt reistor 271-0130 as it was as close to 0.50 ohms as they had I also bought a 1 ohm 1o watt resistor 271-0131 .First I hooked the 1 ohm one up on a 510 clone that measured 3.8 ohms ,with no load I measured 5.15 volts and with the 1 ohm resistor I measured 3.54 volts under load ,with the 0.47 ohm resistor I measured 3.91 volts under load.So I soldered the 0.47 ohm resistor inline on my homemade PT and I think it really improved things,just like having a fresh battery all the time.I also built the box mod in Jim Davis's picture only without the audio connecter .Very easy just follow the directions for the passthrough just leave the battery connectors in one side.I would reccomend using a 510 or 901 atty though I used a 302 and the AAA box was a very tight fit for the atty connecter.Sorry I couldn't take any pix as my son has my camera.

[zelda]

I'm about as handy as Gomer Pyle but I sure like the looks of those passthroughs. My last 3 Chinese ones lasted a grand total of 18 days
total. They just stopped dead.

If anyone is interested in making one for sale I could buy please let me know. I'll be your friend for life.

[guesters]

In building my own passthrough, what connector can I purchase at radio shack when I don't have an old battery to cut one from off of? It's to fit my 510 magma atty from Volcano?

Thanks

[mcquinn]

Rdio shack does not have the connectors,you will have to purchase those from MadVapes ,very inexpensive and only takes a few days to arrive.They have all the different types available.

[BillyBlack]

You can also get them cheaply here.

Battery connectors

Great place for drip-tips (among other things) also.

DIY & Drip Tips

A very good vendor BTW with great prices.

[guesters]

Thank you for the information!!`

[mcquinn]

When this thread started there was not much available for modders,now there are several sites with parts.

[BillyBlack]

Well here's one of my new PT's.






Note there is no downtube in the bottle, a simple tilt and press feeds the juice. Also the needle/ bottle assembly does not come out. The bottle swings out on the short piece of tubing.