UcPi/2025 Universal Ultracapacitor RPi Power Supply with ultracapacitors pre-installed

Introduction
UcPi is a high performance low cost 5V universal Raspberry Pi ultracapacitor power supply. It was specially designed for all Raspberry Pi audio applications to achieve better sound quality by improving the power supply quality . UcPi uses spring contacts to power to the RPi GPIO directly from the bottom side of the PCB, so the installation will be very easy. UcPi can also be used as a seat base of an audio project with anti vibration spike feet and the possible rubber ring suspensions. Any existing RPi audio project s can be upgraded by the UcPi right away by just simply installing the HAT stack on top of it. UcPi will be in fullyfinished with ultracapacitors pre installed as shipped.

Features and Specifications

• 5V ultracapacitor power supply with two ultracapacitors pre installed. 
• Very well designed gold plated spring contacts to power a Raspberry Pi directly to GPIO from the bottom side of PCB without any additional connections
• Works as a seat base of the whole project. Anti vibration spike feet can be installed. And the rubber ring suspensions are also possible to be installed
• Takes a standard 5V/ 2.5A or higher current USB-C power adapter as input.
• On board power ON/OFF control switch. This switch can also be extended as an external ON/OFF switch.
• Optical isolator controlled ultra low ESR MOSFETs are used to eliminate any possible leakage current and ripple voltage
• Built in active balancers for ultracapacitor protection.
• Low cost but no compromise on performance
  
• Upgrade any existing Raspberry Pi audio project s right away by just simply installing them on top of the UcPi
• DIY friendly.

UcPi 2025 New Features

• Optimized for the new RaspberryPi 5 and all other RaspberryPi generations.
• Hybrid Ultracapacitor and Polymer capacitor  power supply cleaning/filtering technology.
• Upgraded to higher performance 120F/3V ultracapacitors for 20% greater capacity than the previous version.
• 20% lower ESR for higher current applications.
  
• Higher current output terminal connector.
• Input power supply wires other than USB-C can be soldered directly to the PCB.

User's manual (Please read the user's manual before you get started)

Other Documents

Note: 

• To install the new RaspberryPi 5 , please use the shorter 6mm M2.5 standoffs (Sold separately). The default supplied 7mm M2.5 standoffs are for all other RespberryPi versions.
• Please use shorter and higher quality USB-A to USB-C cables. Some low quality USB-C cables may have poor connection contacts and much higher overall resistance. They may not deliver enough current to make UcPi working properly. And some USB-C to USB-C cable may not work correctly for 5V only applications. A good USB-A to USB-C cable solves all the possible issues.
• Apple USB power adapter may not work properly with non-Apple devices, as well as some low quality USB adapters. RaspberryPi USB power adapters are also reported not working well at high current. For UcPi, I recommend good quality brand name USB power adapters, such as an Anker 65W.   Please never use any USB extension cables with UcPi.
• Please keep the switch S1 at OFF position when you connect or disconnect the USB-C cable to J5 to avoid any possible short circuit damage caused by poor USB-C cable connectors.
• It is highly recommended to use the ON-OFF switch to turn on or off a RaspberryPi with the USB-C power adapter always connected to the UcPi.
  

High quality spike feet are available here