2 layers75 × 100 mm Siemens, the printed circuit board in 3D

Siemens

Size: 75 × 100 mm
Copper layers: 2
Thickness: 1.6 mm
Parts: 112
Nets: 75
Pads: 257
Tracks, vias: 468, 31
Pours: 357
Routed: Yes
KiCad: KiCad 9.0 (file 20241229)
Created: 2 Jan 2022
Updated: 25 Aug 2025

Overview

Siemens is an open-source printed circuit board by greyboxaudio, from the greyboxaudio/SIAM-295b repository on GitHub, published under the MIT licence. It is a 2-layer board of 75 × 100 mm with 112 parts on 75 nets, routed with 468 tracks and 31 vias.

It is built around the BCX56. Its parts include 47 resistors, 30 capacitors, 12 transistors, 4 connectors and 2 switches.

Main components

BCX56
SOT-89-3Lhfe=100~250Jiangsu Changjing Electronics Technology (CJ)Bipolar (BJT)

README

README.md

SIAM 295b

This design is based on the Siemens W295b Equalizer.

Project files

Show this board on your page

https://pcbkit.io/boards/greyboxaudio/SIAM-295b

The board's own page, for a message or a post.

Source

Repository: greyboxaudio/SIAM-295b
Board file: SIAM-295b/ClassA/siemens/siemens.kicad_pcb
Commit: a877b8f
Licence: MIT

Parts

112

Qty	Value	Footprint	References
6	4M7	Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder	R24, R29, R31, R38, R39, R40
6	BC849	Package_TO_SOT_SMD:SOT-23	Q1, Q4, Q5, Q8, Q9, Q12
6	BCX56	Package_TO_SOT_SMD:SOT-89-3	Q2, Q3, Q6, Q7, Q10, Q11
4	22u	Capacitor_THT:CP_Radial_D5.0mm_P2.50mm	C8, C16, C18, C30
4	47u	Capacitor_THT:CP_Radial_D7.5mm_P2.50mm	C3, C4, C5, C10
4	5k	Potentiometer_THT:Potentiometer_ACP_CA6-H2,5_Horizontal	RV4, RV18, RV29, RV31
3	100R	Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder	R10, R17, R19
3	10R	Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder	R23, R33, R36
3	10n	Capacitor_THT:C_Rect_L10.0mm_W4.0mm_P7.50mm_MKS4	C23, C25, C35
3	12k	Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder	R2, R25, R34
3	1k3	Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder	R52, R54, R100
3	4u7	Capacitor_THT:CP_Radial_D5.0mm_P2.50mm	C1, C2, C6
3	820R	Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder	R4, R14, R35
3	MountingHole	MountingHole:MountingHole_3.2mm_M3_DIN965	H1, H2, H4
2	100k	Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder	R20, R26
2	100u	Capacitor_THT:CP_Radial_D8.0mm_P3.80mm	C33, C34
2	1k	Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder	R21, R37
2	2k4	Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder	R18, R30
2	30R	Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder	R5, R6
2	3k3	Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder	R28, R53
2	470n	Capacitor_THT:C_Rect_L10.0mm_W4.0mm_P7.50mm_MKS4	C31, C32
2	4n7	Capacitor_THT:C_Rect_L7.2mm_W4.5mm_P5.00mm_FKS2_FKP2_MKS2_MKP2	C21, C22
2	750R	Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder	R50, R51
1	0R	Resistor_SMD:R_1206_3216Metric	R43
1	1.1V	TestPoint:TestPoint_THTPad_1.0x1.0mm_Drill0.5mm	TP1
1	100k	Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical	RV3
1	100n	Capacitor_THT:C_Rect_L10.0mm_W4.0mm_P7.50mm_MKS4	C14
1	10k	Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical	RV1
1	10k	Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder	R1
1	10u	Capacitor_THT:CP_Radial_D5.0mm_P2.50mm	C17
1	150n	Capacitor_THT:C_Rect_L10.0mm_W4.0mm_P7.50mm_MKS4	C7
1	15k	Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder	R3
1	20k	Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder	R13
1	220n	Capacitor_THT:C_Rect_L10.0mm_W4.0mm_P7.50mm_MKS4	C20
1	22R	Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder	R16
1	22n	Capacitor_THT:C_Rect_L10.0mm_W4.0mm_P7.50mm_MKS4	C11
1	24V	TestPoint:TestPoint_THTPad_1.0x1.0mm_Drill0.5mm	TP3
1	2k	Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder	R11
1	2k5	Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical	RV2
1	33R	Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder	R7
1	33n	Capacitor_THT:C_Rect_L10.0mm_W4.0mm_P7.50mm_MKS4	C12
1	33u	Capacitor_THT:CP_Radial_D5.0mm_P2.50mm	C15
1	39k	Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder	R27
1	3k9	Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder	R9
1	47n	Capacitor_THT:C_Rect_L10.0mm_W4.0mm_P7.50mm_MKS4	C13
1	47p	Capacitor_SMD:C_0805_2012Metric	C9
1	4u7	Capacitor_THT:CP_Radial_D5.0mm_P2.00mm	C26
1	51R	Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder	R15
1	51k	Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder	R32
1	5m6	Inductor_THT:L_Radial_D7.0mm_P3.00mm	L1
1	620R	Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder	R101
1	68k	Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder	R12
1	6k2	Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder	R8
1	AUDIO_IN	Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical	J3
1	AUDIO_OUT	Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical	J4
1	Conn_01x08_Pin	Connector_PinHeader_2.54mm:PinHeader_1x08_P2.54mm_Vertical	J2
1	GND	TestPoint:TestPoint_THTPad_1.0x1.0mm_Drill0.5mm	TP4
1	LOGO	LOGO	G***
1	MountingHole	MountingHole:MountingHole_3.2mm_M3_DIN965_Pad	H3
1	PWR_IN	Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical	J1
1	SW_DPDT_x2	Connector_PinHeader_2.54mm:PinHeader_2x03_P2.54mm_Vertical	SW2
1	SW_Rotary_2x6	Connector_PinHeader_2.54mm:PinHeader_2x07_P2.54mm_Vertical	SW1
1	TRIM/SYM	TestPoint:TestPoint_THTPad_1.0x1.0mm_Drill0.5mm	TP2

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64 parts

Questions

How big is the Siemens PCB?

It measures 75 × 100 mm and has 2 copper layers, 1.6 mm thick.

What parts does the Siemens use?

112 parts, built around the BCX56. 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 Siemens KiCad files?

From the greyboxaudio/SIAM-295b repository on GitHub, at the commit this page was made from: the board is SIAM-295b/ClassA/siemens/siemens.kicad_pcb and its schematic SIAM-295b/ClassA/siemens/siemens.kicad_sch. PCBKit opens the board in the browser, with nothing to install.

Can I use the Siemens design in my own project?

Its repository publishes it under the MIT licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).