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dual power supply
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schmitt trigger:
A 30 volt voltage span from a 24 volt input.

No. Definitively you are not going to get it with a purely linear regulator. You do require switchmode regulators.

There are some of options:
1- Two regulators, a buck and an inverting regulator fed each from +24 volt. No transformers, only two inductors.
2- A pushpull converter. This would be my preferred for higher power, but you require an output transformer with both primary and secondary center taps and two inductors.
3- Because the output power is low, a flyback converter would also work, but you still require a transformer with two secondaries. But no inductors.
HB9EVI:
As we all see, there isn't yet much skill, already in the way the question is asked; I don't see much sense in proposing to build switching mode regulators; more meaningful would be to get small a center tapped 18V 10VA transformer and work with the 7815/7915 or LM317/337 if variable voltage is needed.
Lee Leduc:
Unless you're set on designing and building your own, the easy solution is to buy a DC/DC converter. Take a look at a DC/DC converter like the Murata NDS6D2415C. 24VDC in, +/-15VDC at 200ma out.

Stock https://octopart.com/nds6d2415c-murata+power+solutions-49451068
Datasheet https://datasheet.octopart.com/NDS6D2415C-Murata-Power-Solutions-datasheet-8452589.pdf

About $20 USD. You'll have to check price and availability in your country.
+Mikie:

--- Quote from: schmitt trigger on July 19, 2018, 01:55:18 pm ---A 30 volt voltage span from a 24 volt input.

No. Definitively you are not going to get it with a purely linear regulator. You do require switchmode regulators.

--- End quote ---

There is such a thing as capacitive voltage multiplier, invented long time before all this IC stuff. It would be quite feasible for such a low current.

However, save yourself a world of complications and start with a centre-tapped transformer of at least 18V per side. Again, at such a low current it will be small and cheap. Follow that with ANY linear regulator, IC or discrete and that's it.
Zero999:

--- Quote from: paex30 on July 19, 2018, 01:15:58 pm ---I need a +-15V with a maximum current of 170 mA per channel.

--- End quote ---
To power what?

It's quite likely you could re-configure the circuit to use a single 24V power supply, if you told us what the circuit is.
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