2 layers99 × 99 mm
Ultimate soldering exercise
dvhx/smd-soldering-exercise-0805
Ultimate SMD soldering exercise full of 0805 resistor and caps, SOT-23 transistors and SOIC-8 opamps - 23 guitar pedals on one 10x10cm PCB.
464 parts6GPL-3.0
2 layers34 × 88.1 mm
HM2-rounded
kingovchouffe/HM2- Size
- 34 × 88.1 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 95
- Nets
- 56
- Pads
- 226
- Tracks, vias
- 356, 185
- Pours
- 7
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 9 Aug 2022
- Updated
- 30 Mar 2025
Overview
HM2-rounded is an open-source printed circuit board by kingovchouffe, from the kingovchouffe/HM2 repository on GitHub. It is a 2-layer board of 34 × 88.1 mm with 95 parts on 56 nets, routed with 356 tracks and 185 vias.
It is built around the TL072, MMBT3904 and PJ-603A, with the 1N5819WS, MMBFJ201 and MMBT3906 among its other parts. Its parts include 40 resistors, 30 capacitors, 8 diodes, 4 transistors and 3 ICs.
Main components
6
TL072
SOP-8-18V~18V 0℃~+70℃ 1.4mA 1.5nA 10V/us 10mV 2 2.5nA 3MHz 85dB SOP-8 Operational Amplifier ROHSGcoreOperational Amplifier
MMBT3904
SOT-23-55℃~+150℃ 1 NPN 100 100nA 200mA 200mW 300MHz 300mV 40V 6V NPN SOT-23 Bipolar (BJT) ROHSJiangsu Changjing Electronics Technology (CJ)Bipolar (BJT)
PJ-603A
插件-20℃~+70℃ 30V 500mA 6.35mm Headphone Jack Brass Silver 插件 Audio Connectors ROHSHOOYAAudio Connectors (Headphones)
1N5819WS
SOD-3231 Independent 1A 25A 40V 500uA@40V 600mV@1A SOD-323 Schottky Diodes ROHSGuangdong HottechSchottky Diodes
MMBFJ201
SOT-23-3L-55℃~+150℃ 1mA 300mV 350mW 40V N-Channel SOT-23-3L JFETs ROHSonsemiJFETsMMBT3906
SOT-23-55℃~+150℃ 1 PNP 100 100nA 200mA 200mW 300MHz 300mV 40V 5V PNP SOT-23 Bipolar (BJT) ROHSTWGMCBipolar (BJT)
README
README.mdHM2
Parts
95| Qty | Value | Footprint | References |
|---|---|---|---|
| 12 | 10k | Resistor_SMD:R_0603_1608Metric | R3, R9, R10, R12, R18, R30, R31, R34, R35, R38, R41, R42 |
| 7 | 1N4148 | Diode_SMD:D_SOD-323 | D3, D4, D5, D6, D7, D8, D9 |
| 5 | 100k | Resistor_SMD:R_0603_1608Metric | R4, R15, R17, R24, R37 |
| 5 | 100n | Capacitor_SMD:C_0603_1608Metric | C10, C25, C26, C27, C28 |
| 5 | 47n | Capacitor_SMD:C_0603_1608Metric | C1, C8, C14, C15, C20 |
| 4 | 100p | Capacitor_SMD:C_0603_1608Metric | C9, C17, C19, C30 |
| 3 | 1k | Resistor_SMD:R_0603_1608Metric | R8, R27, R36 |
| 3 | 1u | Capacitor_SMD:C_0805_2012Metric | C21, C22, C24 |
| 3 | 330R | Resistor_SMD:R_0603_1608Metric | R7, R13, R21 |
| 3 | 470k | Resistor_SMD:R_0603_1608Metric | R16, R26, R33 |
| 3 | TL072 | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U1, U2, U3 |
| 2 | 10u | Capacitor_SMD:CP_Elec_5x5.4 | C13, C18 |
| 2 | 22k | Resistor_SMD:R_0603_1608Metric | R14, R23 |
| 2 | 3k3 | Resistor_SMD:R_0603_1608Metric | R5, R25 |
| 2 | 68k | Resistor_SMD:R_0603_1608Metric | R1, R29 |
| 2 | MMBT3904 | Package_TO_SOT_SMD:SOT-23 | Q3, Q5 |
| 2 | PJ-603A | AREA_lib_composant:AUDIO-TH_PJ-603A_1 | Audio1, Audio2 |
| 1 | 1.5u | Capacitor_SMD:C_0805_2012Metric | C2 |
| 1 | 10kA | Potentiometer_THT:Potentiometer_Alpha_RD901F-40-00D_Single_Vertical | RV5 |
| 1 | 10n | Capacitor_SMD:C_0603_1608Metric | C29 |
| 1 | 120R | Resistor_SMD:R_0603_1608Metric | R28 |
| 1 | 150R | Resistor_SMD:R_0603_1608Metric | R20 |
| 1 | 150n | Capacitor_SMD:C_0603_1608Metric | C5 |
| 1 | 1M | Resistor_SMD:R_0603_1608Metric | R6 |
| 1 | 1N5819WS | Diode_SMD:D_SOD-323 | D1 |
| 1 | 1n | Capacitor_SMD:C_0603_1608Metric | C23 |
| 1 | 220k | Resistor_SMD:R_0603_1608Metric | R32 |
| 1 | 220u | Capacitor_SMD:CP_Elec_6.3x7.7 | C4 |
| 1 | 22R | Resistor_SMD:R_0603_1608Metric | R19 |
| 1 | 250k Log A | Potentiometer_THT:Potentiometer_Alpha_RD901F-40-00D_Single_Vertical | RV3 |
| 1 | 2M2 | Resistor_SMD:R_0603_1608Metric | R2 |
| 1 | 470p | Capacitor_SMD:C_0603_1608Metric | C16 |
| 1 | 47k | Resistor_SMD:R_0603_1608Metric | R22 |
| 1 | 47u | Capacitor_SMD:CP_Elec_4x5.8 | C12 |
| 1 | 47u | Capacitor_SMD:CP_Elec_6.3x5.8 | C7 |
| 1 | 4n7 | Capacitor_SMD:C_0603_1608Metric | C11 |
| 1 | 68n | Capacitor_SMD:C_0603_1608Metric | C3 |
| 1 | 6n8 | Capacitor_SMD:C_0603_1608Metric | C6 |
| 1 | 82k | Resistor_SMD:R_0603_1608Metric | R11 |
| 1 | Barrel_Jack_MountingPin | Connector_BarrelJack:BarrelJack_Horizontal | J2 |
| 1 | G*** | kibuzzard-66E8688E | kibuzzard-66E8688E |
| 1 | G*** | kibuzzard-66E8676F | kibuzzard-66E8676F |
| 1 | G*** | kibuzzard-66E86754 | kibuzzard-66E86754 |
| 1 | MMBFJ201 | Package_TO_SOT_SMD:SOT-23-3 | Q1 |
| 1 | MMBT3906 | Package_TO_SOT_SMD:SOT-23 | Q2 |
| 1 | TestPoint | TestPoint:TestPoint_Pad_D1.5mm | TP1 |
| 1 | ~ | AREA_lib_composant:3PDT_LED | SW1 |
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Questions
How big is the HM2-rounded PCB?
It measures 34 × 88.1 mm and has 2 copper layers, 1.6 mm thick.
What parts does the HM2-rounded use?
95 parts, built around the TL072, MMBT3904, PJ-603A and 1N5819WS. 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 HM2-rounded KiCad files?
From the kingovchouffe/HM2 repository on GitHub, at the commit this page was made from: the board is Rounded/HM2-rounded.kicad_pcb and its schematic HM2.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the HM2-rounded design in my own project?
Its repository states no licence, so its author keeps all rights: ask kingovchouffe before reusing the design.