I am looking for some ideas on how to build a 120VDC power supply that will be regulated some how so the output voltage won't drop under load. I am currently using a full wave bridge rectifier utilizing line voltage of 120VAC with no filtering. I am not too concerned about ripple or noise as I am using it to test 120VDC solenoids. I do vary the input voltage as low as 70VAC to check minimum pickup of the solenoids. The power supply I am currently using creates a problem because of the unstable voltage under load. I have searched the site but could not find any answers. Any suggestions would be appreciated.