HardLabs

Led bar

BasementCircuits·Sonus7·PCBs/led_bar/led_bar.kicad_pcb

Led bar PCB layout, top view — open source board by BasementCircuits

About the Led bar PCB

Led bar is an open source PCB design by BasementCircuits, published on GitHub under the CERN-OHL-W-2.0 license. It is a 2-layer board measuring 60 × 285 mm, with 62 components from 6 distinct parts.

By type, the board carries 30 diodes, 10 jumpers, 10 capacitors, 10 resistors and 2 connectors.

It belongs with the audio and test & measurement designs in this gallery.

From the project

Analog seven-band spectrum bargraph with op amps.

Each band has a spacing of 1.25 octaves. The bands are: 63 Hz, 160 Hz, 400 Hz, 1.25 kHz, 2.5 kHz, 6.25 kHz, 16 kHz.

The filters are second-order Multiple Feedback bandpass filters using TLC272 opamps. The VU-meters consist of a logaritmic comparator array, also using TLC272 opamps. The project is inspired by a reel of 2000 TLC272 bought cheaply at an auction.

Led bar, from the project README
From the project README

Led bar bill of materials (BOM)

62 components, 6 distinct parts.

QtyPartRefs
1
LED_CONN
J1
1
Conn_01x02
J2
10
JMP_LED
JP1, JP2, JP3, JP4, JP5, JP6, JP7, JP8 +2
30
LED
D1, D2, D3, D4, D5, D6, D7, D8 +22
10
1uF
C1, C2, C3, C4, C5, C6, C7, C8 +2
10
R_LED
R1, R2, R3, R4, R5, R6, R7, R8 +2

Led bar design files

The KiCad project lives in the BasementCircuits/Sonus7 repository on GitHub; these links point at the commit this page was built from.

Led bar: common questions

How big is the Led bar PCB?

The Led bar measures 60 × 285 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Led bar?

62 components, from 6 distinct parts. The full bill of materials is listed on this page.

Where can I download the Led bar design files?

From the BasementCircuits/Sonus7 repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Led bar design in my own project?

Yes, under the terms of its CERN-OHL-W-2.0 license, which BasementCircuits chose for the repository.

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