you need a current regulator.At that moment i don`t have ideea for a IC but try to find at maxim,TI or other sites
look out at http://www.ti.com/product/bq24450 have adjusting output, and regulat both voltage and current
it`s same to be a cheap mod vv this lavatube. Have a big microcontroller for a few function, and have step-up "problem" :), with atty under 2 ohm work in linear mod and output voltage drop to 3.6V.
I use that IC,rebuild all in a custom PCB.It`s a very good switching regulator. Have some advantage this IC: small, work without external shottchy diode, IN/OUT small SMD capacitors.My PCB measure 20mm x 20mm :)
to use linear regulators, such NPC 630 A from madvapes, is not a good ideea.You waste a lot of power on heating.
much better is a step-down switching regulator like lm2576 or lm 2596.On ebay you find a lot of module with this IC.
But the best is mp2307, you find some kis-33 module on ebay...
first what kind of regulator you use on your boxe.I think is a boost convertor with 1 battery, with what IC you made that boxe?
Because of IC or a wrong connection, your booster don`t work :). A good chose is PTN04050C from Texas Instrument
From Ebay 1pc 18650 Battery Case 2 x Parallel Connection DIY Case | eBay
China stuff :)The part of enclosure, where i put 510 connector is fragile need to be doubled with some other plastic or metal part
for step down you can use only 2 battery, 3 or 3.7V each, for step-up use one battery is simple :). you want to use a linear regulator for this you need 2 baterry li-ion,connected in series or an 7.3V pack li-polimer.
@BJ43 it`s true..this LM2596 have shortcircuit protection, overtemperature protection..it`s very hard to damage that IC.
until now i made a lot of mod box in 3xAA box with this and work very good, and is a cheap IC aprox 1 $ for 1 pc.Work well with 1.25 carto :)
anyway work`s grate..It`s possible tu use other IC but this lm2596 have a good performance at a lowest cost :)
uff i forgot to write on the schematic electrolithic capacitors to IN and OUT :(, works fine with 100uF SMD at IN and 220 uF SMD at OUT
about tube mod.Mechanical work was made today.Next i will make electronics stuff.This tube will be with battery charger PCB for two li-ion, and 9V/1A from an external power supply.
It`s a hard work on copper tube :D
And the schematics :D
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