2 layers74.5 × 104.6 mm Trigger seq, the printed circuit board in 3D

Trigger seq

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

Size: 74.5 × 104.6 mm
Copper layers: 2
Thickness: 1.6 mm
Parts: 64
Nets: 65
Pads: 230
Tracks, vias: 524, 7
Pours: 3
Routed: Yes
KiCad: KiCad 6 (file 20211014)
Created: 23 Apr 2026
Updated: 19 Sep 2026

Overview

Trigger seq 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 74.5 × 104.6 mm with 64 parts on 65 nets, routed with 524 tracks and 7 vias.

It is built around the PIC16F15345-E/P, TL072 and LM393. Its parts include 22 resistors, 11 capacitors, 9 diodes, 6 ICs and 5 transistors. It belongs with the PIC boards of this library.

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
13	10K	Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal	R22, R23, R26, R27, R28, R29, R30, R31, R33, R34, R35, R37, R40
7	100n	Capacitor_THT:C_Disc_D7.0mm_W2.5mm_P5.00mm	C3, C4, C6, C8, C10, C11, C12
7	1K	Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal	R25, R36, R38, R39, R41, R42, R45
7	D_Schottky	Diode_THT:D_DO-35_SOD27_P7.62mm_Horizontal	D35, D36, D37, D38, D39, D40, D43
5	2N3904	Package_TO_SOT_THT:TO-92_Inline_Wide	Q1, Q2, Q3, Q4, Q5
3	10uF	Capacitor_THT:CP_Radial_D5.0mm_P2.50mm	C1, C2, C9
2	2.2K	Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal	R24, R43
2	4051	Package_DIP:DIP-16_W7.62mm_LongPads	U5, U6
2	D_Schottky_Small	Diode_THT:D_DO-35_SOD27_P7.62mm_Horizontal	D1, D2
2	Ferrite_Bead_Small	Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal	FB1, FB2
1	330n	Capacitor_THT:C_Disc_D7.0mm_W2.5mm_P5.00mm	C14
1	Euro Power	Connector_IDC:IDC-Header_2x05_P2.54mm_Vertical	P2
1	JACKS_MAIN	Connector_PinHeader_2.54mm:PinHeader_2x08_P2.54mm_Vertical	P4
1	LM393	Package_DIP:DIP-8_W7.62mm_LongPads	U4
1	LM78L05_TO92	Package_TO_SOT_THT:TO-92_Inline_Wide	U1
1	MOTM Power	My Library:MTA-156	P1
1	PIC16F15345	Package_DIP:DIP-20_W7.62mm_LongPads	U3
1	SWITCH_MAIN	Connector_PinHeader_2.54mm:PinHeader_2x08_P2.54mm_Vertical	P7
1	TL072	Package_DIP:DIP-8_W7.62mm_LongPads	U8
1	pickit header	Connector_PinHeader_2.54mm:PinHeader_1x06_P2.54mm_Vertical	P6

The 60 most common of 64 parts.

Questions

How big is the Trigger seq PCB?

It measures 74.5 × 104.6 mm and has 2 copper layers, 1.6 mm thick.

What parts does the Trigger seq use?

64 parts, built around the PIC16F15345-E/P, TL072 and LM393. 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 KiCad files?

From the elmegil/gator repository on GitHub, at the commit this page was made from: the board is hardware/trigger-seq.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 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).

Category and platform

PIC

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" title="Trigger seq 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.jpg" alt="Trigger seq" width="1200" height="900">

A picture that opens the board, for a README

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

Source

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

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