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Opamp vu meter

CASE-Association·christmas-cards·2021/opamp_vu_meter/opamp_vu_meter.kicad_pcb

Opamp vu meter PCB layout, top view — open source AVR/Arduino board by CASE-Association

About the Opamp vu meter PCB

Opamp vu meter is an open source AVR/Arduino PCB design by CASE-Association, published on GitHub under the GPL-3.0 license. It is a 2-layer board measuring 92.5 × 99.7 mm, with 42 components from 27 distinct parts.

Its main chip is the ATTINY44A-M, from the AVR/Arduino family. Other key parts include the L78L05_SOT89 and TLC272. By type, the board carries 18 resistors, 9 diodes, 5 ICs, 5 capacitors, 1 transistor and 1 connector.

From the project

All CASE christmas cards over the years

Go to https://case-association.github.io/christmas-cards/index.html for interactive BOM.

Opamp vu meter, from the project README
From the project README

Main components on the Opamp vu meter

ATTINY44A-ML78L05_SOT89TLC272

Opamp vu meter bill of materials (BOM)

42 components, 27 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
ATTINY44A-M
TLC272
U1
1
L78L05_SOT89
TLC272
U2
3
TLC272
U3, U4, U5
1
Q_PNP_BCE
Q1
1
SK-3296S-01-L1
Conn_01x02
J1
1
Mic
MK1
1
R_POT
RV1
1
MM3Z4V3
Z1
1
SK6805
1N4148
D1
8
SK6805
LED_Small
D2, D3, D4, D5, D6, D7, D8, D9
3
100n
C1, C2, C4
1
220n
C3
1
10uF
C5
1
470
10k
R1
3
100k
R3, R5, R6
2
1k
R4, R7
1
10k
R8
1
10M
R9
1
6.2k
R11
1
4.3k
R12
Show 7 more
QtyPartRefs
1
3k
R13
1
2.2k
R14
1
1.6k
R15
1
1.1k
R16
1
750R
R17
1
43k
R18
2
R_Pack04
RN1, RN2

Opamp vu meter design files

The KiCad project lives in the CASE-Association/christmas-cards repository on GitHub; these links point at the commit this page was built from.

Opamp vu meter: common questions

What microcontroller does the Opamp vu meter use?

The Opamp vu meter is built around the ATTINY44A-M, from the AVR/Arduino family.

How big is the Opamp vu meter PCB?

The Opamp vu meter measures 92.5 × 99.7 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Opamp vu meter?

42 components, from 27 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 Opamp vu meter design files?

From the CASE-Association/christmas-cards repository on GitHub, which has the KiCad layout and the BOM; the links under Design files point to each one.

Can I use the Opamp vu meter design in my own project?

Yes, under the terms of its GPL-3.0 license, which CASE-Association chose for the repository.

Can I test firmware for the Opamp vu meter without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug AVR/Arduino firmware against it before you order a PCB.

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