Summary

You have a bunch of slides laying around but you don't have a projector?
This small projector (16x10x6 cm) allows you to show them on the living room wall.
Not at an impressive size or brightness, but good enough to enjoy these old memories. Without diffuser the corners are darker. With a thin milky glass plate there is less light but it also reaches the corners.
Two PC-fans take care of cooling the heat sink. Push the slides in at one side and they will fall out at the other side.
I still had an old projector lens, but a single lens is O.K. as well.