In the fall of 2015, my engineering classes built 30 photoelectric effect devices as an orientation to using tools and soldering. Some of the solder joints aren't pretty, but they all have been tested and work fine. It was a great mix of practical skill development and service to the school and the science teaching community. At the upcoming workshop, we're selling the apparatus for the cost of the parts.
In April 2016 I am offering a workshop on the photoelectric effect and how to get the best learning impact from the device. If it isn't yet April 9th, sign up to join us! https://www.eventbrite.com/e/photoelectric-effect-make-n-take-workshop-tickets-22946066302
The light source for the device is a set of LED's. Since all of the LED's are clear, it is necessary to label them. I was ready to pull out my model railroad paint when one of my workshop participants in 2014 suggested using fingernail polish. What a brilliant solution!
Here's a close up.