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anyway increase voltage without using ac ? Answered

anyway to increase voltage using only dc input and using low voltage batteries (1.5 ~ 9 V ) ? and without making big or with loads of parts circuit ? ( I need simple circuit) any more taughts than joule thief ?


I need something simple that can take 2.5 to 12 to 15v

how about a boost circuit? maxim sells (sample!) many chips: you could use the max1771, a common boost chip or you can browse their page for one that has less external components.

are there any without external components? I want this to be very simple

There are DC to DC converters, they are simple and need no extra parts but, yep there is a but, they are expensive compared to building a simple Maxim unit like Goodhart suggested... (( The 12 volt input 20 volt output to power my laptop with a total output of 65 watts was $75 CDN but it was simple hook the red to the red wire and the black to the black wire and repeat for the laptop cord ))

Yeah, I guess I should go with the maxim chips. Its just that my soldering iron's tip broke :(

is it a pencil type iron ? Tips aren't too expensive, but if you have a bit still sticking out of the iron, you might be able to file a point to it. :-)

No, unfortunately it broke in a concave shape. I'll have to drill it out. I still haven't found a tip for my 180w gun. (1135 degrees in under 10 seconds makes me giddy!)

Is that one of those weller guns with the trigger button and a little flashlight bulb in the front ?? At work we used to burn out tips all the time (( they cut styrofoam and plastic like a hot knife but I guess that is hard on the tips )) we would just cut a strip of household 12/2 of 14/2 solid wire and bend it into a new tip and this would last for about a month of abuse........ And what sort of input voltage are you looking at and what output voltage are you looking for, and how much power do you need ??

its a chicago electric (harbor freight), but its the same idea. The real tips are nickel plated copper. I was afraid I might ruin something like that. I'm looking at 2-3 volts form a 12x4" solar panel (probably only 50-100 ma) to 12v (current on this side doesn't matter, it will be trickle charging a battery)

Not a chance, it's just a huge very low voltage high current transformer, they normally output only a few volts at allot of Amps and the tip just shorts it out, hence it gets very hot... And the one we have at work is about 20 years old and gets lots of abuse (( we even tried to melt plated nails with it, and the smaller ones actually melted and burned, ok we may have to much time on our hands some times )) oh and we use it to test circuit breakers with to.... Ok so it's about a 1 watt solar panel, are you charging a sealed lead acid cell, or NiCD, NiMH, Lion ?? And what are you looking to power from the battery, and I'm just asking because you might be better to charge a 2.2 VDC battery and stepping up the voltage to 12 VDC when you need it, I'm just thinking power efficiency because with smaller solar systems you don't want to run a DC to DC converter all day, when you only need say five minutes of power a day from the system.... That and you can get away with buying less batteries and your better off charging only one cell, when compared to say charging six...

I don't think its even 1 watt. That would have to be 500ma. I want to charge a SLA to use to charge my phone and mp3. I want it to be stored at 12v so I can use my inverter with it (1 minute of that would probably take a week of charging!) I used to use it to charge alkaline batteries, but that got messy.....

It worked! With a *choke* galvanized *cough* nail, but I need to make a better one and file it's tip so I can use it on finer stuff *passes out*

try hammering the wire flat, I would also twist the very end and kinda flatten in with a pliers to make a point, if you use copper wire it's pretty soft and easy to work with and there is no real right or wrong way of doing it, just experiment till you find some tip that works real good for you (( then make a few spares before you forget what you've done )) .

I did on my 3rd tip. I heated it and hammered it flat and then ground it down a little more. I think I'll do an ible about it. Thanks so much! You just saved me $5!

(( they cut styrofoam and plastic like a hot knife but I guess that is hard on the tips ))

Yeah, the corrosive substance(s) released tend to wear down the tip pretty fast.

Thats why they don't last long, but they cut so nicely, and honestly after being spoiled with a low voltage temp controlled weller, it's really hard to solder any thing small like IC's with such a huge unit, but if you need to solder 8 AWG wire they work good.....

yeah, recently I had need to solder 5 small wires to two pennies....and discovered the usefulness of a hotter iron (I almost did it with the light weight one though :-)

Watch you don't melt those new pennies ... <> cheap copper plated zinc pennies......

Not with my little 15 watt soldering iron....solder would stick to them, but then it was to massive to melt again (the penny sucked the heat right out of the iron ;-)

I was curious the other day and checked my iron and my pyrograph iron....the soldering iron is 15 watts and the pyrograph iron is 25 W ,...no wonder it heats up faster :-) Sorry, that is totally off the subject, but you mentioned your 180 w gun and well, jealousy is not a pretty thing.... ;-)

Go buy yourself one. Mine was about $6 or7 my dad's weller (the broken tip one) is 45w

Nah, this one suites me fine, at least for now. The one Weller I have (somewhere) heats up instantly, but I have fried too many IC's with it....so I stopped using it. With 180 watts you could probably solder copper tubing with that :-)

hehe, more like melt it! I usually just turn it on for just 3 seconds and then us it for about 3 minutes!

Well a butane torch is more efficient with the copper tubing, but yeah, I have a rather large (I can't call it a pencil style iron, because it is more the size of toilet paper roll {the card board center}, then a pencil) iron that really makes the meter spin....but it is a bit unwieldy for work on circuit boards :-)

Yeah, but I can get the propane/butane bottles easier :-)

you can buy premade circuits from various electronic online stores that have all of the components in a package that's the same size as a TO-220 but they cost like 10 bucks + shipping

Although the MAX756 is not going to give you enough boost for what you specify, there are a whole family of MAXIM products that may: MAX756-757

Yeah, but those all need so many external components to work. I want something simple

darn, I was hoping I could find something self contained

. More info at Wikipedia.
. In a nutshell, unless you are dealing with kW+ capacity (and even that appears to be more or less experimental), you have to use AC (actually pulsed DC in most cases) to step up DC. Stepping down is pretty easy.


9 years ago

i need a ac multiplier that will raise the voltage about 3 volts,lm317 circuit is the purpose

nope thats not what im looking for :( . i know joule thief but i need more power :D i need it to charge capacitors up to 1000 ~ or 500 volts

opps sry im wrong i found the thing u said me :D ty very much i think. now thats left is to make one and try it out :D . oh and one more question : Can i convert dc to ac without much of electronic components (i mean without making dificult circuit boards bcz i cant make my pcb's) ?

. Search for "inverter +circuit". . PCBs are just something to mount the part to with the wiring built in - not really required for most DIY projects (although they are usually much easier to work with).

thats good but voltage doubler (multiplier) uses ac voltage. so thats bad bcz i need to increase voltage with batteries which use dc not ac.