How to repair or design a 3005D Electronics Laboratory Variable Power Supply & formulas for 30V 5A

Showing all the secrets about its design. HY3005D or 305D is a common bench variable power supply on the workbench. With this video, students will get the basic knowledge for the first year of their schooling project.
Anybody electronics student will be able to start the homemade power supply project after this video.
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My gear Lab2:
Siglent SDS1204X-E 200MHz Digital Storange Osclloscope Sponsored by SiglentEU dot com
Siglent SDG2042X 120MHz Function/Arbitrary Generator Sponsored by SiglentEU dot com
IEMI E-0208 120MHz Frequency Counter
Uni-T UT71C 4000 Counts True RMS Multimeter Sponsored by Vitacom dot ro & Uni-T
Uni-T UT502 Insulation Resistance Tester
Fluke 8600A 4, 1/2 digit, Digital bench top Multimeter
Newcason XC6013L Capacitance meter
LCR-T4 component tester
ZHAOXIN CD Power Supply TXN-1502D
GORDAK 952 SMD Rework Soldering Station
RadioShack 22-812 Digital Multimeter
MIYAKO 890G Auto DMM
DT-830B Multimeter
TM902C Thermometer
TDGC2A 0.5KVA Auto-transformer
HS1010 Light Meter

My Gear Lab1
ZOYI ZT102A Automatic Portable Digital Multimeter Sponsored By ZOTEK
RIGOL DSO1051 50MHz Digital Storange Osclloscope
FG-050 Low Frequency Function Generator 65.5KHz
DATA PRECISION 2480R True RMS 4, 1/2 digits bench top multimeter 1
DATA PRECISION 2480R True RMS 4, 1/2 digits bench top multimeter 2
ZHAOXIN CD Power Supply TXN-1502D
GORDAK 952 SMD Rework Soldering Station
BRYMEN BM318 Automotive DMM
STEREN PROAM MUL-280 Digital Multimeter
LCR-T4 component tester