+/- 18v from Max1044?

[therecordingart]

I'm reading the application notes, but I'm having a hard time understanding. Is it possible to get +/- 18v from a Max1044? If not, is there a way to do it without using 4 9v batteries?

I'm going to be running two 1N163 mic preamps at +/-18v and applying +18v phantom to the microphones.

[Galego]

It's possible if:

- You have dc in of 18V and use a MAX1044 to get -18v.
- You have two MAX1044 to cascade. One will get 18v from 9v dc in and the other will get you the -18v

[frequencycentral]

You can do it all with one MAX1044, 4 electro caps and 4 diodes. No need for a second chip. Like this, if I recall:

[therecordingart]

You can do it all with one MAX1044, 4 electro caps and 4 diodes. No need for a second chip. Like this, if I recall:

Nice! Thank you!

[therecordingart]

Rick.

How much current can I safely draw from this?

[frequencycentral]

Not much. And I think I may have got the -ve bit wrong, I'll look it up and update the schematic.

[therecordingart]

Not much. And I think I may have got the -ve bit wrong, I'll look it up and update the schematic.

Damn. Then this won't work. Back to the drawing board.

[frequencycentral]

Similar should be possible with the LT1054, which should give 100ma. I'm not so familar with that chip but it's the same principle.

[Scruffie]

I posted this earlier but apparently it didn't go through, here's the schematic and PCB for -/+18V from one MAX or LT1054 (Don't connect Pins 1 & 8 on the LT) http://www.diystompboxes.com/smfforum/index.php?topic=77600.20