2 layers130 × 75 mm
2 layers92.5 × 45 mm
24V PSU for the PreConsonant phono preamplifier
- Size
- 92.5 × 45 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 27
- Nets
- 13
- Pads
- 54
- Tracks, vias
- 97, 0
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 24 Apr 2025
- Updated
- 24 Apr 2025
Overview
24V psu is an open-source printed circuit board by SpinningVinyl, from the SpinningVinyl/PreConsonantPSU repository on GitHub. It is a 2-layer board of 92.5 × 45 mm with 27 parts on 13 nets, routed with 97 tracks and 0 vias.
It is built around the B80C800DM-E3, BC546B and TIP122. Its parts include 9 resistors, 8 capacitors, 2 diodes, 2 transistors and 2 connectors. It belongs with the power boards of this library.
Main components
3B80C800DM-E3
DFM-40℃~+125℃@(Tj) 10uA@125V 125V 1V@900mA 45A 900mA Single-Phase Rectifier DFM Bridge Rectifiers ROHSVishay IntertechnologyBridge Rectifiers
BC546B
TO-921 NPN 100mA 100nA 150MHz 200 300mV 625mW 65V 6V NPN TO-92 Bipolar (BJT) ROHSLGEBipolar (BJT)
TIP122
TO-2201000 100V 2.5V 200uA 5A 5V 65W NPN TO-220 Darlington Transistors ROHSSTMicroelectronicsDarlington Transistors
README
README.mdPreConsonant PSU
Basic Information
This is a 24V PSU I designed for use with the PreConsonant phono preamplifier. It is basically a discrete feedback regulator with an error amplifier consisting of a single transistor (Q2 on the circuit diagram). It is designed to be used with a 24V transformer because I wanted to use an off-the-shelf 24V AC wall wart to power my phono preamplifier build. Since transformers typically have no-load output voltage that can be up to 20% higher than their rated voltage under full load, it was going to be too high for a standard 3-pin voltage regulator IC (e.g. LM7824).
Technical specifications
- Input voltage: between 21 and 30V AC (with the specified components)
- Output voltage: approx. 24V DC
- Load regulation: less than 1% at 100mA output current (component values have been calculated for output currents up to 500mA)
- Ripple and noise: more than 60dB below the output level
Documentation
The documentation (bill of materials and full circuit diagram) is located in the docs folder.
Status of the project
The project has been built and tested.
License
See the LICENSE file for details.
Parts
27| Qty | Value | Footprint | References |
|---|---|---|---|
| 4 | MountingHole | MountingHole:MountingHole_3.2mm_M3 | H1, H2, H3, H4 |
| 2 | 100n | Capacitor_THT:C_Rect_L7.2mm_W3.5mm_P5.00mm_FKS2_FKP2_MKS2_MKP2 | C1, C7 |
| 2 | 120R | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R2, R3 |
| 2 | 2200u | Capacitor_THT:CP_Radial_D18.0mm_P7.50mm | C2, C3 |
| 2 | 680R | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R1, R4 |
| 1 | 100u | Capacitor_THT:CP_Radial_D10.0mm_P5.00mm | C5 |
| 1 | 10k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R7 |
| 1 | 10u | Capacitor_THT:C_Radial_D5.0mm_H11.0mm_P2.00mm | C4 |
| 1 | 12V | Diode_THT:D_DO-41_SOD81_P7.62mm_Horizontal | D2 |
| 1 | 1k2 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R8 |
| 1 | 3k3 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R6 |
| 1 | 470u | Capacitor_THT:CP_Radial_D12.5mm_P5.00mm | C6 |
| 1 | 4R7 | Resistor_THT:R_Axial_DIN0414_L11.9mm_D4.5mm_P5.08mm_Vertical | R9 |
| 1 | 4u7 | Capacitor_THT:CP_Radial_D4.0mm_P2.00mm | C8 |
| 1 | 5k6 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R5 |
| 1 | AC_IN | TerminalBlock:TerminalBlock_MaiXu_MX126-5.0-02P_1x02_P5.00mm | J1 |
| 1 | B80C800DM | Diode_THT:Diode_Bridge_DIP-4_W7.62mm_P5.08mm | D1 |
| 1 | BC546B | Package_TO_SOT_THT:TO-92_HandSolder | Q2 |
| 1 | DC_OUT | TerminalBlock:TerminalBlock_MaiXu_MX126-5.0-02P_1x02_P5.00mm | J2 |
| 1 | TIP122 | Package_TO_SOT_THT:TO-220-3_Vertical | Q1 |
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Questions
How big is the 24V psu PCB?
It measures 92.5 × 45 mm and has 2 copper layers, 1.6 mm thick.
What parts does the 24V psu use?
27 parts, built around the B80C800DM-E3, BC546B and TIP122. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the 24V psu KiCad files?
From the SpinningVinyl/PreConsonantPSU repository on GitHub, at the commit this page was made from: the board is 24V_psu.kicad_pcb and its schematic 24V_psu.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the 24V psu design in my own project?
Its repository states no licence, so its author keeps all rights: ask SpinningVinyl before reusing the design.