Standard three-legged voltage regulator chips like the LM317 can cope with an input voltage of up to about 30V, a few high-voltage types can handle 60V but if that is still not sufficient for your application the company Supertex (www.super-tex.com) produce devices that can with-stand much higher input voltages. The regulator type LR8 has a maximum input voltage of 450V and can supply an output
