2 layers89.1 × 104.6 mm Trigger seq panel, the printed circuit board in 3D

Trigger seq panel

gator ("gate-er") trigger sequencer eurorack module

Size: 89.1 × 104.6 mm
Copper layers: 2
Thickness: 1.6 mm
Parts: 98
Nets: 95
Pads: 275
Tracks, vias: 377, 41
Pours: 2
Routed: Yes
KiCad: KiCad 6 (file 20211014)
Created: 23 Apr 2026
Updated: 19 Sep 2026

Overview

Trigger seq panel is an open-source printed circuit board by elmegil, from the elmegil/gator repository on GitHub, published under the MIT licence. It is a 2-layer board of 89.1 × 104.6 mm with 98 parts on 95 nets, routed with 377 tracks and 41 vias.

It is built around the TL072, S15 and S10, with the S11, S14 and S16 among its other parts. Its parts include 32 diodes, 23 resistors, 20 switches, 9 connectors and 3 capacitors.

Main components

README

README.md

"Hook's Gator" trigger (gate) sequencer.

Controls:

tempo
gate width (need to state range)
step count
swing (50% - no swing, to 70%)
run/stop switch and gate input
forward/backward (need to test backward with swing) switch and gate input
reset button and gate input
clock in + clock out (external clock is reflected on the output and overrides internal tempo)
1x16 or 2x8 operation -- in 1x16 both outputs reflect the same
each step has a switch that indicates if there should be a gate out on that step or not.

Parts

Qty	Value	Footprint	References
20	1K	Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal	R1, R2, R3, R4, R10, R11, R12, R13, R14, R15, R16, R17, R18, R20, R21, R32 +4
16	1N4148	Diode_THT:D_DO-35_SOD27_P7.62mm_Horizontal	D11, D12, D13, D14, D15, D16, D17, D18, D27, D28, D29, D30, D31, D32, D33, D34
16	SW_SPDT	My Library:submini_toggle_SPDT_2267079	SW1, SW2, SW3, SW4, SW5, SW6, SW7, SW8, SW10, SW11, SW12, SW13, SW14, SW15, SW16, SW17
3	10K	Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal	R9, R19, R44
2	100n	Capacitor_THT:C_Disc_D7.0mm_W2.5mm_P5.00mm	C5, C7
1	22n	Capacitor_THT:C_Disc_D7.0mm_W2.5mm_P5.00mm	C13
1	2N3904	Package_TO_SOT_THT:TO-92_Inline_Wide	Q6
1	CKIN	myfootprints:thonkiconn_stereo	J4
1	CLOCK_OUT	My Library:thonkiconn	J7
1	JACKS_PANEL	Connector_PinSocket_2.54mm:PinSocket_2x08_P2.54mm_Vertical	P8
1	LOGO	My Library:frogleg	G***
1	OUT1	My Library:thonkiconn	J1
1	OUT2	My Library:thonkiconn	J2
1	RATE	Walter Resistors:trimmer_alps-rk09k1130ah1	RV1
1	RESET	My Library:thonkiconn	J3
1	RESET	myfootprints:C&K_round_pushbutton	SW20
1	RUN_STOP	My Library:thonkiconn	J5
1	Run/Stop	My Library:submini_toggle_SPDT_2267079	SW18
1	S1	My Library:LED_D3.0mm	D3
1	S10	My Library:LED_D3.0mm	D20
1	S11	My Library:LED_D3.0mm	D21
1	S12	My Library:LED_D3.0mm	D22
1	S13	My Library:LED_D3.0mm	D23
1	S14	My Library:LED_D3.0mm	D24
1	S15	My Library:LED_D3.0mm	D25
1	S16	My Library:LED_D3.0mm	D26
1	S2	My Library:LED_D3.0mm	D4
1	S3	My Library:LED_D3.0mm	D5
1	S4	My Library:LED_D3.0mm	D6
1	S5	My Library:LED_D3.0mm	D7
1	S6	My Library:LED_D3.0mm	D8
1	S7	My Library:LED_D3.0mm	D9
1	S8	My Library:LED_D3.0mm	D10
1	S9	My Library:LED_D3.0mm	D19
1	STEPS	Walter Resistors:trimmer_alps-rk09k1130ah1	RV3
1	SWING	Walter Resistors:trimmer_alps-rk09k1130ah1	RV4
1	SWITCH_PANEL	Connector_PinSocket_2.54mm:PinSocket_2x08_P2.54mm_Vertical	P3
1	SW_DPDT_x2	My Library:submini_toggle_DPDT_wider	SW9
1	TL072	Package_DIP:DIP-8_W7.62mm_LongPads	U2
1	UP_DOWN	My Library:thonkiconn	J6
1	Up/Down	My Library:submini_toggle_SPDT_2267079	SW19
1	WIDTH	Walter Resistors:trimmer_alps-rk09k1130ah1	RV2

The 94 most common of 98 parts.

Questions

How big is the Trigger seq panel PCB?

It measures 89.1 × 104.6 mm and has 2 copper layers, 1.6 mm thick.

What parts does the Trigger seq panel use?

98 parts, built around the TL072, S15, S10 and S11. 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 Trigger seq panel KiCad files?

From the elmegil/gator repository on GitHub, at the commit this page was made from: the board is hardware/trigger-seq-panel.kicad_pcb and its schematic hardware/clock.kicad_sch. PCBKit opens the board in the browser, with nothing to install.

Can I use the Trigger seq panel 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/elmegil-gator-trigger-seq-panel" title="Trigger seq panel 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/elmegil-gator-trigger-seq-panel.jpg" alt="Trigger seq panel" width="1200" height="900">

A picture that opens the board, for a README

[![Trigger seq panel](https://pcbkit.io/embed/boards/elmegil-gator-trigger-seq-panel.jpg?size=s)](https://pcbkit.io/boards/elmegil-gator-trigger-seq-panel)

Source

Repository: elmegil/gator
Board file: hardware/trigger-seq-panel.kicad_pcb
Commit: b85acf5
Licence: MIT

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