I have a 12V DC power supply and have a digital guitar pedal that needs 15V DC. There are a few other 9V/5V power circuits that I created using voltage regulators and a couple of capacitors, but I'm not familiar with how to go UP in voltage.
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In simple terms it's called a boost converter and, fairly efficiently takes a lower supply voltage and transforms it to a higher supply voltage. You can buy plenty of off-the-shelf items that will do the job - try ebay.
One word of warning though - if it's to be used for audio applications (such as the guitar pedal) you may need to boost up to (say) 18V then use a linear voltage regulator to generate 15V. Typical candidate would be an LM7815 for this.
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1\$\begingroup\$ Can you elaborate on why the boost would need to be 18 then regulated down? I assume due to ripple or noise. \$\endgroup\$– JYeltonOct 1, 2014 at 20:51
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1\$\begingroup\$ @JYelton I assume you know why and you are correct. A boost regulator will produce low/medium high frequency ripple that needs to be gotten rid of and raising the voltage to 18V then, using a linear regulator (which fights against ripple on the input supply side) should hopefully produce a clean 15v suitable for your pedal/audi device. What pedal is it BTW? If it's a rough old distortion pedal you might be able to live without the linear regulator. \$\endgroup\$– Andy akaOct 1, 2014 at 20:55
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1\$\begingroup\$ Yes, I am familiar with this, so was commenting to verify (but also to suggest that you include the reason why in the answer). \$\endgroup\$– JYeltonOct 1, 2014 at 20:57
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\$\begingroup\$ @JYelton - you seemed more flippant about earths on the moon and or planets LOL \$\endgroup\$– Andy akaOct 1, 2014 at 20:59
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\$\begingroup\$ Haha, yes, I change moods frequently and without warning! :) \$\endgroup\$– JYeltonOct 1, 2014 at 21:15