The HP DPS-1200FB is a high-efficiency server power supply unit (PSU) commonly used in server racks within data centers. Noted for its robust performance, it offers up to 100 amps at 12 volts, making it suitable for powering high-demand servers and networking equipment. The DPS-1200FB has gained popularity beyond its intended server farm use, especially among hobbyists and DIY enthusiasts. It is often modified for use in a variety of applications such as charging lithium-polymer (LiPo) batteries, running 3D printers, amateur radio transmitters, amateur radio linear amplifiers and other extreme power-intensive projects due to its stable and substantial power output.
Popular modifications to the HP DPS-1200FB power supply, especially for use with LiPo chargers, 3D printers or amateur radio linear amplifiers include:
- Soldering a Resistor for Activation: The power supply is tricked into thinking it has been inserted into a server bay by soldering a resistor between specific pins (330 Ω to 1000 Ω). This modification is essential to start using the power supply outside of its standard server environment.
- Voltage Adjustment: The HP DPS-1200FB usually provides slightly more than 12V. For precise voltage requirements, such as exactly 12V for 3D printers, an adjustment screw can be used to fine-tune the voltage. Turning this wheel counterclockwise will increase the voltage.
- Connecting Two Power Supplies for 24V Output: To achieve a 24V output, two HP DPS-1200FB units can be connected in series. This requires modifications such as disconnecting the ground pad from the housing ground and ensuring the correct connection between the master and slave units
- Physical Modifications for High Current Operations: For high current requirements, modifications include soldering 12V and GND connections both above and below to evenly distribute the load. Additionally, modifications like grinding spacers and using nylon screws are part of the process when connecting two units for 24V output.
These modifications significantly enhance the versatility of the HP DPS-1200FB power supply, allowing it to be used for a variety of applications beyond its original server farm use.
