2 layers89.2 × 30.3 mm
2 layers100 × 35 mm
LED Sound Power Meter
jaka/electronicsschematics and PCBs
- Size
- 100 × 35 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 37
- Nets
- 26
- Pads
- 100
- Tracks, vias
- 163, 0
- Routed
- Yes
- KiCad
- KiCad 6 (file 20211014)
- Created
- 9 Jun 2026
- Updated
- 27 Sep 2026
Overview
LED Sound Power Meter is an open-source printed circuit board by jaka, from the jaka/electronics repository on GitHub. It is a 2-layer board of 100 × 35 mm with 37 parts on 26 nets, routed with 163 tracks and 0 vias.
It is built around the LM386 and LM3914N-1. Its parts include 12 diodes, 8 resistors, 7 capacitors, 2 ICs and 1 crystal. It belongs with the audio and music and sensors and measurement boards of this library.
Main components
2README
Flashing Lights Triple Duo/README.mdFlashing Lights Triple Duo
This circuit consists of two 555 timers configured at different frequencies. These frequencies are selected so that red LED’s and blue LED’s alternatively flashes. Moreover each group (red or blue) flashes aproximately three times before colour is switched, similar to american police strobe lights.
- EDA: Kicad 7.0.11
Parts
37| Qty | Value | Footprint | References |
|---|---|---|---|
| 11 | LED | LED_THT:LED_D5.0mm | D2, D3, D4, D5, D6, D7, D8, D9, D10, D11, D12 |
| 5 | 2k7 | Resistor_THT:R_Axial_DIN0309_L9.0mm_D3.2mm_P12.70mm_Horizontal | R3, R4, R5, R6, R7 |
| 4 | 10uF | Capacitor_THT:CP_Radial_D5.0mm_P2.00mm | C1, C2, C3, C4 |
| 4 | MountingHole | MountingHole:MountingHole_3.2mm_M3 | H1, H2, H3, H4 |
| 1 | 100k | Resistor_THT:R_Axial_DIN0309_L9.0mm_D3.2mm_P12.70mm_Horizontal | R2 |
| 1 | 100k | Potentiometer_THT:Potentiometer_Piher_PT-10-V10_Vertical_Hole | RV1 |
| 1 | 10k | Resistor_THT:R_Axial_DIN0309_L9.0mm_D3.2mm_P12.70mm_Horizontal | R1 |
| 1 | 10n | Capacitor_THT:C_Rect_L7.0mm_W3.5mm_P2.50mm_P5.00mm | C7 |
| 1 | 1N4001 | Diode_THT:D_DO-41_SOD81_P10.16mm_Horizontal | D1 |
| 1 | 1u | Capacitor_THT:CP_Radial_D5.0mm_P2.00mm | C6 |
| 1 | 47n | Capacitor_THT:C_Rect_L7.0mm_W3.5mm_P2.50mm_P5.00mm | C5 |
| 1 | 50 | Resistor_THT:R_Axial_DIN0309_L9.0mm_D3.2mm_P12.70mm_Horizontal | R8 |
| 1 | BATT | Connector_JST:JST_PH_B2B-PH-K_1x02_P2.00mm_Vertical | X1 |
| 1 | LM386 | Package_DIP:DIP-8_W7.62mm_LongPads | U1 |
| 1 | LM3914N | Package_DIP:DIP-18_W7.62mm_LongPads | U2 |
| 1 | MIC | fp:GMI9745P | MK1 |
| 1 | MODE | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | JP1 |
Questions
How big is the LED Sound Power Meter PCB?
It measures 100 × 35 mm and has 2 copper layers, 1.6 mm thick.
What parts does the LED Sound Power Meter use?
37 parts, built around the LM386 and LM3914N-1. 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 LED Sound Power Meter KiCad files?
From the jaka/electronics repository on GitHub, at the commit this page was made from: the board is LED Sound Power Meter/F2.kicad_pcb and its schematic Amplifier TDA2030/TDA2030.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the LED Sound Power Meter design in my own project?
Its repository states no licence, so its author keeps all rights: ask jaka before reusing the design.
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