Preamp Board

colektamu·ECEN404-2026SP-TIAmplifier·Cole - Pre and power Amp/preamp_with_digital_pot/preamp_with_digital_pot/preamp_with_digital_pot.kicad_pcb

Preamp Board layout, top view — open source board by colektamu

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About the Preamp Board

Preamp Board is an open source PCB design by colektamu, published on GitHub. It is a 2-layer board measuring 100 × 80 mm, with 43 components from 24 distinct parts.

Other key parts include the OPA1656ID and MCP4131-xxxx-P. By type, the board carries 16 resistors, 13 capacitors, 6 ICs and 5 connectors.

From the project

Files from 403 and 404

Main components on the Preamp Board

OPA1656ID MCP4131-xxxx-P

Preamp Board bill of materials (BOM)

43 components, 24 distinct parts — part numbers from the project's BOM.

Qty	Part	Footprint	Refs
2	OPA1656ID	SOIC-8_3.9x4.9mm_P1.27mm	U1, U2
4	MCP4131-xxxx-P	DIP-8_W7.62mm	U3, U4, U5, U6
1	AUDIOJACK3_GROUND Conn_01x02	JST_EH_B2B-EH-A_1x02_P2.50mm_Vertical	J1
1	CONN_01X02 Conn_01x02	JST_EH_B2B-EH-A_1x02_P2.50mm_Vertical	J2
1	AudioJack3	Jack_3.5mm_CUI_SJ1-3523N_Horizontal	J4
1	Conn_01x02	JST_EH_B2B-EH-A_1x02_P2.50mm_Vertical	J5
1	Conn_01x07	JST_EH_B7B-EH-A_1x07_P2.50mm_Vertical	J6
3	10K R_Potentiometer	Potentiometer_Alps_RK163_Single_Horizontal	RV1, RV2, RV3
2	2.2μF	C_Rect_L19.0mm_W5.0mm_P15.00mm_MKS4	C1, C13
1	100NF 100nF	C_Rect_L7.2mm_W2.5mm_P5.00mm_FKS2_FKP2_MKS2_MKP2	C2
1	2.2NF 2.2nF	C_Rect_L7.2mm_W2.5mm_P5.00mm_FKS2_FKP2_MKS2_MKP2	C3
1	22PF 22pF	C_Disc_D3.0mm_W1.6mm_P2.50mm	C4
3	10μF	CP_Radial_D5.0mm_P2.00mm	C5, C7, C10
3	0.1μF	C_Disc_D3.0mm_W1.6mm_P2.50mm	C6, C8, C9
1	15NF 15nF	C_Rect_L7.2mm_W2.5mm_P5.00mm_FKS2_FKP2_MKS2_MKP2	C11
1	22NF 22nF	C_Rect_L7.2mm_W2.5mm_P5.00mm_FKS2_FKP2_MKS2_MKP2	C12
2	100K 100k	R_1206_3216Metric	R1, R2
2	5k	R_1206_3216Metric	R3, R7
2	2.8K 2.8k	R_1206_3216Metric	R4, R8
1	22K 22k	R_1206_3216Metric	R5

Show 4 more

Qty	Part	Footprint	Refs
1	4.7K 4.7k	R_1206_3216Metric	R6
4	47K 47k	R_1206_3216Metric	R9, R10, R12, R14
2	3.6K 3.6k	R_1206_3216Metric	R11, R13
2	10K 2.2k	R_1206_3216Metric	R16, R17

Preamp Board design files

The KiCad project lives in the colektamu/ECEN404-2026SP-TIAmplifier repository on GitHub; these links point at the commit this page was built from.

Preamp Board: common questions

How big is the Preamp Board?

The Preamp Board measures 100 × 80 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Preamp Board?

43 components, from 24 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 Preamp Board design files?

From the colektamu/ECEN404-2026SP-TIAmplifier repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.

Can I use the Preamp Board design in my own project?

The repository has no license, so all rights stay with colektamu. Use it as a reference, and ask the author before reusing the design.

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