The box for the laser

Ok, so I broke open the lasers in order to be able to control them electronically.
Then I had to put them into a box again, to make them safe and usable.

Here is the open box:



From left to right we first see the BNC connector, the battery holder, and then on the right:



from top to bottom: the MOSFET (a IRLD024, as recommended by Segor), the internal electronics as found in the pen. The MOSFET is connected to the exact same pins as the actual button of the laser pen. This button is still there (at the back of the tiny PCB) - and can still be used for testing -, as are the remains of the pen.

To close the box, we put the other half on. This may need some wiggling to get it all right. Then there are two screws:





and when we screw them tight, we have a nice black box:



As was quite clearly visible in the first picture, there is quite a lot of space left between the battery holder and the electronics. This space can be used to screw on a connector for the microphone stand.