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DIY step up switching regulator?

I have a 6v power supply from 4 D cells that I need to convert into 24v in order to drive a solenoid. Can somebody direct me to a switching regulator circuit that I could build? Alternatively, if someone knows of a semiconductor that I could obtain that would do this, that would be great. However, I have looked around quite a bit and have not found anything.

Again, my request is for a 6Vin to 24Vout switching regulator circuit, with about 500mA - 1A output...

Thanks!

Try the National LM3488 or the 3478. Look for the Simple Switcher design guide on-line.

Steve