PC POWER SUPPLY MODIFICATION TO BE 13.8 VDC OUTPUT

General :

• Reference : http://www.users.on.net/~endsodds/smps.htm
• WARNING   : ELECTRICAL SHOCK HAZARD !!!
• Ensure the output always connected to load (existing Fan or additional 100 Ohm/2 Watt Resistor, otherwise the power supply will be malfunction forever !!!).

Original / Prior modification

After Modifaction

Personal Comment :

• Simple and easy to be implemented

Another short cut :

1. Remove R40 and R39 (feed back from 3.3 V and 5.0 V)
2. Replace R41 with R fixed 10 kOhm serie with VR 47 kOhm (for adjusting Output up 15 VDC)
3. Replace C16 and C17 with 4700 uF/ 35 VDC for ripple supression