HardLabs

IBus BT analog module

the-vty·bmw-ibus-bluetooth·bmw_bt_cdcemu_analog/bmw_bt_cdcemu_analog.kicad_pcb

IBus BT analog module layout, top view — open source board by the-vty

About the IBus BT analog module

IBus BT analog module is an open source PCB design by the-vty, published on GitHub under the LGPL-3.0 license. It is a 2-layer board measuring 49 × 30 mm, with 49 components from 25 distinct parts.

Other key parts include the NE5532. By type, the board carries 22 resistors, 17 capacitors, 4 transistors, 4 connectors, 1 IC and 1 diode.

It belongs with the audio, iot & wireless and rf & radio designs in this gallery.

From the project

BMW IBus Bluetooth audio

The goal of this project was to create a device that emulates CD changer protocol being connected to IBus. It works with the radio e46 "Business CD" and enables CD changer menu and inputs. Blusetooth functionality is based on the F-3188 variant of CSR8645 module (A2DP/AVRCP/HFP/HSP).

Ibus interface is implemented using MELEXIS - K-Bus Transceiver TH3122. Interface between IBus and CSR8645 is implemented on Atmega328p. Uses steering wheel buttons, buttons on the radio for pairing, switching tracks, rewind, making calls, transfer phone calls between hands-free and a phone, play audio files.…

Main components on the IBus BT analog module

NE5532

IBus BT analog module bill of materials (BOM)

49 components, 25 distinct parts.

QtyPartRefs
1
NE5532
U1
1
BC807
Q1
1
2N7002
Q2
1
B847
Q3
1
Q_NMOS_GSD
Q4
1
Mic Bias
J3
1
DIFF_IN
P1
1
AUD_OUT
P2
1
PWR_EN
P3
1
D
D6
4
33p
C1, C8, C9, C17
2
10u
C3, C11
4
1u
C4, C5, C12, C13
1
100u
C29
1
47u
C32
1
100n
C33
3
0.22u
C35, C36, C38
1
22u
C37
8
10k
R1, R4, R7, R8, R11, R13, R14, R15
2
680
R2, R5
Show 5 more
QtyPartRefs
6
10k
R3, R6, R9, R26, R28, R31
2
1k
R10, R30
2
2.2k
R19, R20
1
15k
R29
1
220k
R32

IBus BT analog module design files

The KiCad project lives in the the-vty/bmw-ibus-bluetooth repository on GitHub; these links point at the commit this page was built from.

IBus BT analog module: common questions

How big is the IBus BT analog module?

The IBus BT analog module measures 49 × 30 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the IBus BT analog module?

49 components, from 25 distinct parts. The full bill of materials is listed on this page.

Where can I download the IBus BT analog module design files?

From the the-vty/bmw-ibus-bluetooth repository on GitHub, which has the KiCad layout; the links under Design files point to each one.

Can I use the IBus BT analog module design in my own project?

Yes, under the terms of its LGPL-3.0 license, which the-vty chose for the repository.

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