By using an isolation transformer-variac-full wave bridge rectifier and a capacitor, I have built a AC to DC power supply. Now, I would like to regulate the output. My desire is to get a 150V DC constant output. For that I decided to use this LM317HV and want to apply the configuration given in the link. http://www.ti.com/lit/an/snva583/snva583.pdf
Can I directly connect this to the output of an Isolation Transformer-Variac-Bridge Rectifier-Capacitor group as shown in the image? Or, do I need something connected in between?
Also, should I use the negative output of the rectifier as a ground connections of the regulator? Or, by leaving the negative output unconnected, should I use the earth ground as shown?
Thanks in advance!