Time to get this site upgraded, so we are passing the hat around. We appreciate any donations. Seriously, even a dollar helps. The payment page may be found here - https://www.audiokarma.org/support.html
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There is no shortage of devices to do the job. If it were me, I'd use a power zener diode of about 47 Volts in series with an 18 Volt regulator chip, the 7818. How much current do you need?
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