NEJE PCB Exposer

Pimp up the "neje" style engraver to expose UV sensistive PCB

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Pimp up the "neje" style engraver to expose UV sensistive PCB
This is currently only a scribble.
First i have to envestigate the laser driver....

The "NEJE Diy Mini Engraver" (google it or aliexpress it) is sold in basically different forms: Open Gantry style and Framed Enclosre style.

To my knowledge there is no official manufacturer for it. The hardware design seems to be derived from this project -> http://www.instructables.com/id/Pocket-laser-engraver/ .

My model is "Open Gantry style".

It consists basicall of the following parts:

- Outer frame to hold it all together

- A "300mW" 405 nm laser assembly (incl. driver circuit)

- Two DVD Frames with motors/spindles and head carrier

- Two "schmalzhaus" easy stepper drivers based on allegro a3967 ics

- An Arduino Mini "Clone" board

- A "motherboard" PCB for wiring up all these components and for a ULN2003 darlington array which is used to switch the laser on and off

Burning up the photoresist
Gnathonemus • 07/03/2016 at 15:20 • 0 comments

The first trials with showed that the movement of the laser head is to slow:
"Burning" a pcb layout did exactly that:
the photoresist was burnt so it stuck to the board, during the development process, instead of dissvoling as expected.
Inspect/Mod laser driver
Gnathonemus • 07/03/2016 at 15:14 • 0 comments

The laser (driver) is drawing 267mA at 5V.
Added a transistor/resistor to laser driving circuit to toggle laser.