Rpi-9v psu hat
About the Rpi-9v psu hat
Rpi-9v psu hat is an open source PCB design by ssosik, published on GitHub. It is a 2-layer board measuring 41.9 × 55.9 mm, with 20 components from 15 distinct parts.
Other key parts include the NMH0515SC and MC7809CTG. By type, the board carries 3 inductors, 2 ICs and 1 connector.
It belongs with the power & battery and dev boards & breakouts designs in this gallery.
From the project
Files for a Raspberry Pi hat for delivering a clean +9V power supply, suitable for driving a sensitive electret microphone preamp circuit
A KiCad-designed Raspberry Pi HAT that generates a clean, isolated +9V supply from the Pi's 5V GPIO rail, intended to power low-noise electret microphone preamplifier circuits (such as the ESP P93) for field audio recording applications like BirdNET-Pi.
The Pi's 5V supply rail is noisy — unsuitable for sensitive microphone preamp circuits without significant filtering and regulation. This HAT addresses that with a multi-stage power supply chain:
Main components on the Rpi-9v psu hat
Rpi-9v psu hat bill of materials (BOM)
20 components, 15 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | NMH0515SC | Converter_DCDC_Murata_NMAxxxxSC_THT | U1 |
| 1 | MC7809CTG | TO-220-3_Vertical | U2 |
| 1 | CONN_02X20_ODD_EVEN Conn_02x20_Odd_Even | PinSocket_2x20_P2.54mm_Vertical | J1 |
| 3 | 100µF/16V | CP_Radial_D8.0mm_P5.00mm | C_9V1, C_IN1, C_REG1 |
| 2 | 100nF | C_Disc_D5.0mm_W2.5mm_P2.50mm | C_9V2, C_REG2 |
| 1 | 1µF X5R | C_Disc_D5.0mm_W2.5mm_P5.00mm | C_IN2 |
| 1 | 10µF/25V X7R | CP_Radial_D5.0mm_P5.00mm | C_NMH1 |
| 1 | 100nF/50V | C_Disc_D5.0mm_W2.5mm_P2.50mm | C_NMH2 |
| 1 | 4.7µF/25V X7R | CP_Radial_D5.0mm_P2.50mm | C_NMH3 |
| 2 | +9V_filt_out | JST_XH_B2B-XH-A_1x02_P2.50mm_Vertical | OUT1, OUT2 |
| 1 | 47Ω | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R_9V1 |
| 1 | 2k2 | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R_BLEED1 |
| 1 | 4.7Ω | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R_IN1 |
| 2 | Ferrite Bead | L_0603_1608Metric_Pad1.05x0.95mm_HandSolder | FB1, FB2 |
| 1 | 11R104C 100µH | L_Radial_D5.0mm_H7.5mm_P2.00mm | L1 |
Rpi-9v psu hat design files
The KiCad project lives in the ssosik/rpi-9v-psu-hat repository on GitHub; these links point at the commit this page was built from.
Rpi-9v psu hat: common questions
How big is the Rpi-9v psu hat?
The Rpi-9v psu hat measures 41.9 × 55.9 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Rpi-9v psu hat?
20 components, from 15 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.
Where can I download the Rpi-9v psu hat design files?
From the ssosik/rpi-9v-psu-hat repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.
Can I use the Rpi-9v psu hat design in my own project?
The repository has no license, so all rights stay with ssosik. Use it as a reference, and ask the author before reusing the design.
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