there are such things as thin film resisters which are more than likely smaller, handle the more power and are actually accurate. Something like this? Digi-Key - CPA25Q8.2TR-ND (Manufacturer - CPA2512Q8R20FS-T10) 6mmx3mm and about 1/2mm thick for 8ohm 16w. Since the op never posted pics I can only speculate that his is thicker than 1mm. These are smaller than the diameter of a AAA/10440 Maybe 6ohm Digi-Key - CPA25Q6.8TR-ND (Manufacturer - CPA2512Q6R80FS-T10) although with a standard atty and 8v you'd probably want something like Digi-Key - CPA25Q4.7CT-ND (Manufacturer - CPA2512Q4R70FS-T10) which would give you around an amp with regular atty, although personally I'd look for attys with 2.25-2.5ohms for killer vapage.
Originally Posted by BobTheKlown
Last edited by illuxion; 10-17-2010 at 04:51 AM.
I am a meat popsicle.
I really don't understand your numbers. How could a 6Ω resister added to the mix possibly work?
If we start with 7.2V and a 2.2Ω atty we get about 22 watts (ouch). Adding a 6Ω resistor (8.2Ω total) we get 6.3 watts, but isn't the 6Ω resistor dissipating 73% of those watts leaving the atty itself at a paltry 4.6 watts?
Adding 1Ω to the mix makes sense to me. 7.2V @ 3.2Ω = 16.2 watts. The 1Ω resistor is dissipating 31% of the watts leaving the atty at about a nice 11 watts.
Am I not understanding this correctly?
I think it would be a matter of preference. For me, with 2 x 3.2v batteries (~6.4v) a 3.1ohm to 3.4ohm resistance is about ideal.
So, 6.4v through 3.2ohms ~= 2Amps ~= 12.8Watts
I suppose I would be happy with with anything down to maybe just under 11 Watts and probably up to just over 13 Watts.
If I only had one I would probably choose a 1ohm resistor disk.
What I'm wondering is where does the heat go and would that be an issue?
Last edited by illuxion; 10-18-2010 at 07:15 PM.
Reason: playing EE while drunk doesn't work.
I am a meat popsicle.
But I think the original intent was a simple insertable solution to use with existing equipment.
I have a BB. Fits 1 x 14500 battery or 2 x CR2 batteries. I want to end up with 11, 12, 13 or so Watts from the coil.
I don't want to buy or make a different PV. I want to use my existing supply of batteries and chargers.
That pretty much limits the solution (as far as I can think of) to an insertable disk in the battery compartment (spring would accomodate it) or an adaptor thingie between the atty/carto?
2 or maybe 3 such devices providing different fixed attenuation would cover most everything... The atty/cartos I use are either in the 2.4ohm range or the 3.2 ohm range so I could make do with just 2 different ones.
Anything new on this? Anyone get this to work on 6v reducing the preloaded voltage to 5v? I'm very interested in this. It's gonna be one of these "resistor discs" or The Terminator by NotCigs.
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