OT: Converting from 12v to 24v

[MattAnonymous]

Hey here's another OT question from me.  I'm working on a gas saving device that uses a float switch and solenoid valve, but both work at 24v and the car runs at 12v.  I've done some searching, but haven't found anything specific to those voltages.  I was hoping that you guys could point me in the right direction.  If you guys can point me to a forum that deals with general electronics, please do.  I'll, then, save this forum for my FX posts.

Thanks,
Matt

[nelson]

wouldnt the charge pump over at geofex be able to double 12v to 24v?

sure someone will provide the link.

there is a link under power supplies or something at GGG

[phillip]

I probably wouldn't try it with a MAX1044.  The data sheet recommends a maximum input voltage of 10V and a pretty small input current.

I don't think there are any charge pumps that would be able to handle the kind of current that you'd need.

Phillip

[TheBigMan]

I know the ICL7660S charge pump can handle a 12V input and gives just under 23V output, but I doubt it would be able to handle the kind of current you'd need.  I might be wrong though, the datasheet is online at the Intersil website IIRC.  I started using them because they're easier to source in the UK than MAX1044s and have the same pinout and boost option.

[cd]

Forget about using a 1044 or 7660.  Google around for voltage doublers (buck & boost), if you need lots of current you can use an inductor based one.  I don't have the links handy but there's tons of them out there.  Since you're not dealing with audio frequencies, your options open up immensely.

[cd]

Here's a link to get you started:

http://www.hills2.u-net.com/electron/smps.htm

[MartyMart]

Forget about using a 1044 or 7660.  Google around for voltage doublers (buck & boost), if you need lots of current you can use an inductor based one.  I don't have the links handy but there's tons of them out there.  Since you're not dealing with audio frequencies, your options open up immensely.

cd, could I safely get 18v from a 9v supply with the MAX1044 as per the
article ?
I need 18v for an Ibanez Flanger which EATS 2x batteries !!  :shock:
Also for a Mutron III+ so it will be in its own small enclosure.....

Thanks,
Marty.
( sorry for the hi-jack ! )

[cd]

Forget about using a 1044 or 7660.  Google around for voltage doublers (buck & boost), if you need lots of current you can use an inductor based one.  I don't have the links handy but there's tons of them out there.  Since you're not dealing with audio frequencies, your options open up immensely.

cd, could I safely get 18v from a 9v supply with the MAX1044 as per the
article ?
I need 18v for an Ibanez Flanger which EATS 2x batteries !!  :shock:
Also for a Mutron III+ so it will be in its own small enclosure.....

Thanks,
Marty.
( sorry for the hi-jack ! )

Depends what your current needs are.  IIRC a 1044 can output 20mA.  If you need more than that, you'll have to parallel two 1044s, or try a different circuit.

[aron]

I tried looking around but I couldn't find anything appropriate.

[MattAnonymous]

Thanks for the info guys.  I got the stuff in today and hooked up a universal dc converter.  They actually only need about 9v so I think I should be fine.  I was surprised, though, that there isn't much out there that will double the 12v.

Thanks again,
Matt

[niftydog]

try this DC-DC converter kit (which is basically a fancy-shmancy switch mode power supply)

There should be other similar products out there.

You find them in the funniest places... I found a 5-9V DC-DC converter on an old Intel LAN card at the local junk recyclers!

[TheBigMan]

Forget about using a 1044 or 7660.  Google around for voltage doublers (buck & boost), if you need lots of current you can use an inductor based one.  I don't have the links handy but there's tons of them out there.  Since you're not dealing with audio frequencies, your options open up immensely.

cd, could I safely get 18v from a 9v supply with the MAX1044 as per the
article ?
I need 18v for an Ibanez Flanger which EATS 2x batteries !!  :shock:
Also for a Mutron III+ so it will be in its own small enclosure.....

Thanks,
Marty.
( sorry for the hi-jack ! )

You can indeed.  The whole reason I first checked out the ICL7660S (Maplin sell them pretty cheap) was to put a charge pump into an old Ibanez FL-301.  Works fine too.  There's a vero layout in my gallery for a voltage doubler.