https://oshpark.com/projects/k3tN98E9
Parts: https://www.mouser.com/ProjectManager/ProjectDetail.aspx?AccessID=bc14af5dff
In a 1590G:
Maybe room for a tact fire switch in a 1550P:
Much thanks for help the guys from http://www.reddit.com/r/BoxModders/ https://www.facebook.com/groups/boxmodders/. The board is based on their 555 pwm mosfet with n-fet schematic & diagram.


Parts: https://www.mouser.com/ProjectManager/ProjectDetail.aspx?AccessID=bc14af5dff
In a 1590G:


Maybe room for a tact fire switch in a 1550P:


Much thanks for help the guys from http://www.reddit.com/r/BoxModders/ https://www.facebook.com/groups/boxmodders/. The board is based on their 555 pwm mosfet with n-fet schematic & diagram.