The titled power supply works well with merely 1~2mV ripple. The power transformer has two separate secondary windings, namely 200Vac 120mA and 18Vac 50mA. Use 330uF 300V filter cap is good enough. I use a Bourns 250K knobpot to make precision output voltage adjustment. The circuit is published in the Motorola Linear/Switchmode Voltage Regulator Handbook HB206 Rev 2 page 28.