Q17-Mini, the Quad405 reborn

stefaweb·Q17-Amplifier·Q17-Mini-3.0/KiCad source/Q17-Mini.kicad_pcb

Q17-Mini, the Quad405 reborn PCB layout, top view — open source board by stefaweb

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About the Q17-Mini, the Quad405 reborn PCB

Q17-Mini, the Quad405 reborn is an open source PCB design by stefaweb, published on GitHub under the GPL-3.0 license. It is a 2-layer board measuring 95 × 75 mm, with 84 components from 55 distinct parts.

Other key parts include the OPA828 and NDC7003P. By type, the board carries 31 resistors, 17 transistors, 17 capacitors, 10 diodes, 6 connectors and 2 ICs.

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

From the project

The Q17 is an error correction HIFI amplifier based on the QUAD405 current dumping principle.

THD: 0.011% S/N : 102 dB Intermodulation distortion: 0,2% Frequency response: ±0,2 dB Damping factor : 350 with 1.2Vrms sensibility, 290 with 0.7Vrms sensibility Default gain: 22 with input gain at 1.2Vrms, 35 with input gain at 0.7Vrms. DC offset at output: 1mV with OPA1611, 0mV with OPA828. Power supply : 50Vdc Idle consumption: 9W

These measurements were made with amateur measuring equipment. It is better to take them as an indication than as safe values. The first version of the board was released on December 8, 2021. Version 3.0.4 was published on October 7, 2024.

Q17-Mini, the Quad405 reborn, from the project README — From the project README

Main components on the Q17-Mini, the Quad405 reborn

OPA828 NDC7003P

Q17-Mini, the Quad405 reborn bill of materials (BOM)

84 components, 55 distinct parts.

Qty	Part	Footprint	Refs
1	OPA828	SOIC-8_3.9x4.9mm_P1.27mm	U1
1	NDC7003P	NDC7003P-TSOT23-6	U2
2	IRF610	TO-220-3_Vertical	Q1, Q13
1	SI2328DS	SOT-23_Handsoldering	Q1'
2	KSA992	TO-92_Inline_Wide	Q2, Q10
2	KSC1845	TO-92_Inline_Wide	Q3, Q12
2	IRF9610	TO-220-3_Vertical	Q4, Q14
1	SI2325DS	SOT-23_Handsoldering	Q4'
1	FQPF7P20	TO-220-3_Vertical	Q5
1	FQPF3N80C	TO-220-3_Vertical	Q6
1	LSK170B	TO-92_Inline_Wide	Q7
1	DN2540	TO-92_Inline_Wide	Q8
1	BS250P	TO-92S_Wide	Q9
1	FQA46N15	TO-3P-3_Vertical	Q15
1	IXTQ36P15P	TO-3P-3_Vertical	Q16
1	INPUT	Input_connector_mix_inverted	J1
1	SPK+	Faston_Connector_63849-1_TEC	J2-1
1	SPK-	Faston_Connector_63849-1_TEC	J2-2
1	V+	Faston_Connector_63849-1_TEC	J3-1
1	GND	Faston_Connector_63849-1_TEC	J3-2

Show 35 more

Qty	Part	Footprint	Refs
1	V-	Faston_Connector_63849-1_TEC	J3-3
2	RED 2V	LED_D5.0mm	D1, D4
2	1N5248B	D_DO-35_SOD27_P7.62mm_Horizontal	D2, D3
2	1N5245B	D_DO-35_SOD27_P7.62mm_Horizontal	D5, D6
2	MMSZ5245C	D_SOD-123	D7, D10
2	SL1M-AQ	D_SOD-123	D8, D9
1	1.2uH	L_Axial_L22mm_D10mm_P21mm_vertical_Q17_Mini	L1
1	470p Mica	C_Mica_v2_L11.4mm_W4.3mm_H9.1_P5.9mm_mix	C1
1	100uF/10V BP	CP_Radial_D10.0mm_P5.00mm	C2
2	47uF/25V	CP_Radial_D10.0mm_P2.50mm_P5.00mm	C3, C6
6	100nF	C_Rect_L7.2mm_W2.5mm_P5.00mm_FKS2_FKP2_MKS2_MKP2	C4, C5, C8, C9, C11, C12
1	2.2uF MKP	C_Rect_L26.5mm_W10.5mm_P22.50mm_MKS4	C7
1	47pF Mica	C_Mica_v2_L11.4mm_W4.3mm_H9.1_P5.9mm_mix	C10
2	220uF/63V	CP_Radial_D12.5mm_P5.00mm	C13, C14
2	470uF/63V	CP_Radial_D16.0mm_P7.50mm	C15, C16
1	100nF MKP or MKT	C_Rect_L18.0mm_W7.0mm_P15.00mm_FKS3_FKP3	C17
1	2k7	R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal	R1
2	10k/1W	R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal	R2, R21
1	150R	R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal	R3
1	1k	R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal	R4
1	196R/0.5W	R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal	R6
7	100R	R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal	R7, R8, R9, R29, R30, R40, R41
2	8R2	R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal	R10, R13
2	47R/2W	R_Axial_DIN0411_L9.9mm_D3.6mm_P12.70mm_Horizontal	R11, R12
3	330R	R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal	R14, R19, R20
1	270R	R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal	R15
1	47k	R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal	R16
1	4k75	R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal	R17
1	22k	R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal	R18
1	8k2	R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal	R23
1	10k	R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal	R24
1	7k5	R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal	R25
2	22R/1W	R_Axial_DIN0411_L9.9mm_D3.6mm_P12.70mm_Horizontal	R26, R28
1	560R/1W	R_Axial_DIN0411_L9.9mm_D3.6mm_P12.70mm_Horizontal	R27
1	10R/2W	R_Axial_DIN0411_L9.9mm_D3.6mm_P15.24mm_Horizontal	R31

Q17-Mini, the Quad405 reborn design files

The KiCad project lives in the stefaweb/Q17-Amplifier repository on GitHub; these links point at the commit this page was built from.

LayoutQ17-Mini-3.0/KiCad source/Q17-Mini.kicad_pcb
SchematicQ17-Mini-3.0/KiCad source/Q17-Mini.kicad_sch

Q17-Mini, the Quad405 reborn: common questions

How big is the Q17-Mini, the Quad405 reborn PCB?

The Q17-Mini, the Quad405 reborn measures 95 × 75 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Q17-Mini, the Quad405 reborn?

84 components, from 55 distinct parts. The full bill of materials is listed on this page.

Where can I download the Q17-Mini, the Quad405 reborn design files?

From the stefaweb/Q17-Amplifier repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Q17-Mini, the Quad405 reborn design in my own project?

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

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