Hey Rod,
I think you would be better off building/hacking your own power supply speciall if you want to add the SX-1 to expand your CD32. The originals were very minimal for power output and were not designed with any expansion of the CD32 in mind.
I do have a SX-1 that I might be willing to sell or trade. Have you decided what you are going to do with the IV24 w/transcoder box? Do you have the cable that goes from the IV24 to the transcoder box?
David