Sound Pressure Meter
About the Sound Pressure Meter PCB
Sound Pressure Meter is an open source PCB design by SmartOpenLab, published on GitHub under the GPL-3.0 license. It is a 2-layer board measuring 98.6 × 41.3 mm, with 52 components from 33 distinct parts.
Other key parts include the TL074, WeMos_mini and AP1117-33. By type, the board carries 25 resistors, 10 capacitors, 9 connectors, 4 ICs, 3 diodes and 1 microphone.
From the project
Repository of Smart Open Lab projects
We developed a PCB for preamplification, filtering and integration of the analog input signal.
Main components on the Sound Pressure Meter
Sound Pressure Meter bill of materials (BOM)
52 components, 33 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 2 | TL074 | DIP-14_W7.62mm | U1, U2 |
| 1 | WeMos_mini | D1_mini_board | U3 |
| 1 | AP1117-33 | TO-220-3_Vertical | U4 |
| 1 | VCC+ | Pin_Header_Angled_1x01_Pitch1.27mm | J1 |
| 2 | GND | Pin_Header_Angled_1x01_Pitch1.27mm | J2, J3 |
| 1 | VDD- | Pin_Header_Angled_1x01_Pitch1.27mm | J5 |
| 1 | Ajuste señal salida | Pin_Header_Angled_1x01_Pitch1.27mm | J7 |
| 1 | Ajuste nivel umbral | Pin_Header_Angled_1x01_Pitch1.27mm | J8 |
| 1 | Salida Previo | Pin_Header_Angled_1x01_Pitch1.27mm | J9 |
| 2 | CONN_01X08 | Pin_Header_Straight_1x08_Pitch1.00mm | P1, P2 |
| 1 | Microphone_Condenser | WireConnection_0.80mmDrill | MK1 |
| 3 | 1N4148 | D_T-1_P5.08mm_Horizontal | D1, D2, D3 |
| 1 | 1u | C_Axial_L3.8mm_D2.6mm_P10.00mm_Horizontal | C1 |
| 1 | 2.2u | C_Axial_L3.8mm_D2.6mm_P10.00mm_Horizontal | C2 |
| 1 | 2.2n | C_Disc_D4.3mm_W1.9mm_P5.00mm | C3 |
| 2 | 100n | C_Rect_L7.0mm_W2.0mm_P5.00mm | C4, C5 |
| 2 | 4.7n | C_Disc_D4.3mm_W1.9mm_P5.00mm | C6, C7 |
| 1 | 1n | C_Disc_D4.3mm_W1.9mm_P5.00mm | C8 |
| 2 | 33u | C_Axial_L3.8mm_D2.6mm_P10.00mm_Horizontal | C9, C10 |
| 1 | 300 | R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal | R1 |
Show 13 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 9 | 1k | R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal | R2, R4, R9, R10, R12, R13, R18, R21 +1 |
| 1 | 2.2k | R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal | R3 |
| 2 | 20 k | R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal | R5, R25 |
| 1 | 10k | Potentiometer_Trimmer_Bourns_3296Y | R6 |
| 1 | 10k | R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal | R7 |
| 1 | 1k | Potentiometer_Trimmer_Bourns_3296Y | R8 |
| 1 | 50k | Potentiometer_Trimmer_Bourns_3296Y | R11 |
| 1 | 1.5k | R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal | R14 |
| 1 | 6.04 k | R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal | R15 |
| 1 | 56.7k | R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal | R16 |
| 3 | 82.5 k | R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal | R17, R19, R22 |
| 1 | 150 k | R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal | R20 |
| 1 | 4k | R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal | R23 |
Sound Pressure Meter design files
The KiCad project lives in the SmartOpenLab/Proyectos repository on GitHub; these links point at the commit this page was built from.
Sound Pressure Meter: common questions
How big is the Sound Pressure Meter PCB?
The Sound Pressure Meter measures 98.6 × 41.3 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Sound Pressure Meter?
52 components, from 33 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 Sound Pressure Meter design files?
From the SmartOpenLab/Proyectos repository on GitHub, which has the KiCad layout and the BOM; the links under Design files point to each one.
Can I use the Sound Pressure Meter design in my own project?
Yes, under the terms of its GPL-3.0 license, which SmartOpenLab chose for the repository.
