2 layers39 × 100 mm Snh, the printed circuit board in 3D

Snh

A sample and hold circuit for a modular synth (Eurorack format) based on the LF398.

Size: 39 × 100 mm
Copper layers: 2
Thickness: 1.6 mm
Parts: 54
Nets: 46
Pads: 160
Tracks, vias: 199, 1
Pours: 1
Routed: Yes
KiCad: KiCad 8.0 (file 20240108)
Created: 19 Feb 2025
Updated: 28 Dec 2025

Overview

Snh is an open-source printed circuit board by xdylanm, from the xdylanm/sample-and-hold repository on GitHub, published under the MIT licence. It is a 2-layer board of 39 × 100 mm with 54 parts on 46 nets, routed with 199 tracks and 1 via.

It is built around the TL072 and BC547. Its parts include 18 resistors, 17 capacitors, 7 connectors, 4 diodes and 3 ICs.

Main components

README

README.md

Sample and Hold

A sample and hold circuit for a modular synth (Eurorack format) based on the LF398.

Parts

Qty	Value	Footprint	References
7	100n	Capacitor_THT:C_Disc_D4.7mm_W2.5mm_P5.00mm	C9, C10, C11, C12, C13, C14, C15
6	1k	Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P2.54mm_Vertical	R1, R8, R9, R10, R15, R16
4	100k	Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P2.54mm_Vertical	R5, R11, R12, R14
2	10	Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal	R17, R18
2	10u	Capacitor_THT:CP_Radial_D4.0mm_P2.00mm	C7, C8
2	10u	Capacitor_THT:C_Disc_D4.7mm_W2.5mm_P5.00mm	C4, C17
2	D_Schottky	Diode_THT:D_DO-35_SOD27_P2.54mm_Vertical_AnodeUp	D3, D4
1	100k	Potentiometer_THT:Potentiometer_Bourns_PTV09A-1_Single_Vertical	RV3
1	10k	Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P2.54mm_Vertical	R3
1	10n	Capacitor_THT:C_Disc_D4.7mm_W2.5mm_P5.00mm	C16
1	15k	Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P2.54mm_Vertical	R4
1	1M0	Potentiometer_THT:Potentiometer_Bourns_PTV09A-1_Single_Vertical	RV1
1	1N4148	Diode_THT:D_DO-35_SOD27_P2.54mm_Vertical_AnodeUp	D1
1	1n	Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P5.00mm	C2
1	1n	Capacitor_THT:C_Rect_L7.0mm_W2.0mm_P5.00mm	C3
1	1u	Capacitor_THT:C_Disc_D4.7mm_W2.5mm_P5.00mm	C1
1	22p	Capacitor_THT:C_Disc_D4.7mm_W2.5mm_P5.00mm	C6
1	22u	Capacitor_THT:C_Disc_D4.7mm_W2.5mm_P5.00mm	C5
1	40106	Package_DIP:DIP-14_W7.62mm_Socket	U1
1	47k	Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P2.54mm_Vertical	R13
1	4k7	Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P2.54mm_Vertical	R7
1	4k7	Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal	R2
1	6k8	Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P2.54mm_Vertical	R6
1	A100k	Potentiometer_THT:Potentiometer_Bourns_PTV112-4_Dual_Vertical	RV2
1	Attenuverter In	AudioJacks:Jack_3.5mm_QingPu_WQP-PJ301M-12_Vertical	J3
1	Attenuverter Out	AudioJacks:Jack_3.5mm_QingPu_WQP-PJ301M-12_Vertical	J6
1	BC547	Package_TO_SOT_THT:TO-92_Inline_Wide	Q1
1	In	AudioJacks:Jack_3.5mm_QingPu_WQP-PJ301M-12_Vertical	J2
1	LED	LED_THT:LED_D3.0mm_Clear	D2
1	LF398_DIP8	Package_DIP:DIP-8_W7.62mm_Socket	U2
1	Out	AudioJacks:Jack_3.5mm_QingPu_WQP-PJ301M-12_Vertical	J4
1	Pwr	Connector_IDC:IDC-Header_2x05_P2.54mm_Vertical	J7
1	SW_SPDT	Switches:SW_Dailywell_SPDT_2MS1T1B1M1	SW1
1	Smooth Out	AudioJacks:Jack_3.5mm_QingPu_WQP-PJ301M-12_Vertical	J5
1	TL072	Package_DIP:DIP-8_W7.62mm_Socket	U3
1	Trigger	AudioJacks:Jack_3.5mm_QingPu_WQP-PJ301M-12_Vertical	J1

Questions

How big is the Snh PCB?

It measures 39 × 100 mm and has 2 copper layers, 1.6 mm thick.

What parts does the Snh use?

54 parts, built around the TL072 and BC547. 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 Snh KiCad files?

From the xdylanm/sample-and-hold repository on GitHub, at the commit this page was made from: the board is hardware/snh/snh.kicad_pcb and its schematic hardware/snh/snh.kicad_sch. PCBKit opens the board in the browser, with nothing to install.

Can I use the Snh 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).

Project files

Show this board on your page

A live frame, for any web page

<iframe src="https://pcbkit.io/embed/boards/xdylanm-sample-and-hold" title="Snh in PCBKit" width="100%" height="480" style="border:0;border-radius:12px" allow="fullscreen" loading="lazy"></iframe>

A picture

<img src="https://pcbkit.io/embed/boards/xdylanm-sample-and-hold.jpg" alt="Snh" width="1200" height="900">

A picture that opens the board, for a README

[![Snh](https://pcbkit.io/embed/boards/xdylanm-sample-and-hold.jpg?size=s)](https://pcbkit.io/boards/xdylanm-sample-and-hold)

Source

Repository: xdylanm/sample-and-hold
Board file: hardware/snh/snh.kicad_pcb
Commit: 8a324fe
Licence: MIT

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