2 layers30 × 42 mm Copv2, the printed circuit board in 3D

Copv2

Dwell converter/shaper for a stock ECU COP conversion on a Miata

Size: 30 × 42 mm
Copper layers: 2
Thickness: 1.6 mm
Parts: 31
Nets: 26
Pads: 87
Tracks, vias: 176, 13
Pours: 1
Routed: Yes
KiCad: KiCad 10.0 (file 20260206)
Created: 10 Aug 2025
Updated: 29 Jun 2026

Overview

Copv2 is an open-source printed circuit board by swagprincess, from the swagprincess/coilonplug repository on GitHub, published under the GPL-3.0 licence. It is a 2-layer board of 30 × 42 mm with 31 parts on 26 nets, routed with 176 tracks and 13 vias.

It is built around the ATTINY84A-SSF, LM393 and DMP3098LSD-13-VB. Its parts include 12 resistors, 6 capacitors, 3 ICs, 1 transistor and 1 connector. It belongs with the AVR (ATmega, ATtiny) boards of this library.

Main components

README

README.md

Dwell converter board

This board lets you use a Toyota/Audi/etc "coil on plug" ignition system with the stock ecu in a Mazda MX5/Miata (1989-2005).

The board will take in a variable dwell signal for the stock coilpack and output a (falling edge synchronised) stable, adjustable dwell pulse.

Current setting is 70 "ticks" of TIMER1, around 2.2ms, correct for Toyota COP's at running voltages (should be good for Audi R8 coils too).

Written in C for an AtTiny84A.

Parts

Qty	Value	Footprint	References
8	TestPoint	TestPoint:TestPoint_Pad_4.0x4.0mm	GND, IGN1, IGN1/4, IGN2, IGN2/3, IGN3, IGN4, VCC
6	10k	Resistor_SMD:R_0603_1608Metric	R1, R2, R3, R4, R11, R12
4	100	Resistor_SMD:R_0603_1608Metric	R7, R8, R9, R10
3	100n	Capacitor_SMD:C_0603_1608Metric	C1, C5, C6
2	4.7k	Resistor_SMD:R_0603_1608Metric	R5, R6
1	10u	Capacitor_SMD:C_0603_1608Metric	C2
1	2200u	Capacitor_THT:CP_Radial_D12.5mm_P5.00mm	C4
1	330n	Capacitor_SMD:C_0603_1608Metric	C3
1	ATtiny84A-SS	Package_SO:SOIC-14_3.9x8.7mm_P1.27mm	U1
1	Conn_02x03_Counter_Clockwise	Connector_PinHeader_2.54mm:PinHeader_2x03_P2.54mm_Vertical	J1
1	DMP3098LSD-13	Package_SO:SOIC-8_3.9x4.9mm_P1.27mm	Q1
1	LM393	Package_SO:SOIC-8_3.9x4.9mm_P1.27mm	U2
1	LM78M05_TO252	Package_TO_SOT_SMD:TO-252-2	U3

Questions

How big is the Copv2 PCB?

It measures 30 × 42 mm and has 2 copper layers, 1.6 mm thick.

What parts does the Copv2 use?

31 parts, built around the ATTINY84A-SSF, LM393 and DMP3098LSD-13-VB. 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 Copv2 KiCad files?

From the swagprincess/coilonplug repository on GitHub, at the commit this page was made from: the board is kicad/v2/copv2.kicad_pcb and its schematic kicad/v2/copv2.kicad_sch. PCBKit opens the board in the browser, with nothing to install.

Can I use the Copv2 design in my own project?

Its repository publishes it under the GPL-3.0 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

AVR (ATmega, ATtiny)

Project files

Show this board on your page

A live frame, for any web page

<iframe src="https://pcbkit.io/embed/boards/swagprincess-coilonplug-copv2" title="Copv2 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/swagprincess-coilonplug-copv2.jpg" alt="Copv2" width="1200" height="900">

A picture that opens the board, for a README

[![Copv2](https://pcbkit.io/embed/boards/swagprincess-coilonplug-copv2.jpg?size=s)](https://pcbkit.io/boards/swagprincess-coilonplug-copv2)

Source

Repository: swagprincess/coilonplug
Board file: kicad/v2/copv2.kicad_pcb
Commit: 83d5b8b
Licence: GPL-3.0

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