Double Chip Doubler: +/-18v From Single 9V - Verified

[soulsonic]

I verified this circuit on a breadboard today and it works. Its a clever way to get a bipolar voltage-doubled supply from a single 9v battery and 2 MAX1044 chips.

This is the first time I've ever seen this circuit. It's not included in either the app notes or R.G.'s article on the '1044. It's something I came up by combining two of the circuits from the app notes together. Not totally original, but no one's bothered to try putting the two different doublers together yet, so I decided to give it a go and it works great.

In my test circuit, I measured +16.3v and -17.2v from a battery that measures 8.73v. I used 1N400x diodes, but you can get the positive and negative supplies to be closer to the same voltage if you use low drop diodes for the positive doubler section.

This link has both the schematic and simple layout for the circuit with a pnp board design.
Check it out!
http://aronnelson.com/gallery/soulsonic-fx/Double_Chip_Doubler_copy

If you see any fatal errors in the layout or design, please let me know.

Enjoy.

[ulysses]

cool mate

will check it out.

cheers
ulysses

[Electric_Death]

I built one of these out of the TL7660 but still have trouble getting it to power up my op amps to to any real level of efficiency. Another huge setback is, the sucker sure does whine! The plus side? I'm getting 18 volts out of it.

[PerroGrande]

I'm getting a 404 (not found) error from the link...

[Paul Perry (Frostwave)]

Try: http://aronnelson.com/gallery/v/soulsonic-fx/Double_Chip_Doubler_copy.gif.html

[gez]

I verified this circuit on a breadboard today and it works. Its a clever way to get a bipolar voltage-doubled supply from a single 9v battery and 2 MAX1044 chips.

I've never used these chips, so don't know the ins and outs, but I've routinely stuck passive doubler circuits (cap and diode jobbies) at the output of oscillators and they double up voltage.  Could a couple of doubler networks be used with a single chip (or a power amp chip set oscillating, as R Penfold is prone to doing) to get the same result??

[soulsonic]

A single MAX1044 is not able to double the negative supply - that is why two chips are required.

I've seen circuits that accomplish the same thing with a 555, but the current consumption is appreciably higher.

[Aren]

Looks interesting!
Has anyone tried it in a "real life" setting? If this works, and is not terribly noisy, it could be fantastic for a mic preamp.

[soulsonic]

I've only done it on a breadboard so far, to prove it's functionality. I haven't had anything circuits that require it's use yet.
I'm assuming it should have the usual performance you'd expect from a MAX1044.