In almost any Dollar store you can find an inexpensive birthday card that plays the “Happy Birthday” tune (or some other) when you open it.
If you remove the works and remove the battery, you can hook up a solar panel as shown. The panel shown is 1.5 volts. (If using 1 volt panels, you would need two in series to provide enough voltage to make the speaker work.)
After removing the battery, use one alligator clip to clip together the contacts where the small piece of card slipped in and out as a “switch”, and attach the other clip to one of the two solder connections leading to the speaker. With very little light it will start playing the “Happy Birthday” tune.
Now, here’s the neat part – if you rapidly move your hand back and forth between the solar panel and the incoming sunlight, alternately shading and unshading the solar panel, the music will change pitch.
It can create a somewhat ghostly wavering sound, not unlike the Theremin, of early last century.
What is a Theremin? “The theremin is rare among musical instruments in that it is played without physical contact.”
“By the way, I really appreciate your well designed SolGear kits – they are proving very useful with our education programs teaching solar PV and electric motor efficiency.”
On building a solar boat: My friends are amazed at the power and motor speed of solar.
“I am very pleased with the materials and have been showing the panels and motor to others already their reactions are consistently one of being amazed.”
“Hi…just want to let you know that the school project was a big success! He got an A+ on it… especially because it was an original idea.”
“These kits are a lot more hands-on than the last group I purchased and I am sure the students will enjoy the project quite a lot more.”
“The solar cars worked GREAT. This activity was a huge hit with the campers and we were able to generate some excellent discussion and learning about alternative energy, climate change, etc, etc.”
“We had our *Bring Your Child To Work Day* last week. The kids (ages 7 – 13) had a great time learning about solar power and building their cars. Hearing the younger kids squeal with excitement as their cars began to move on the patio was priceless. Having the spare parts in the kits was helpful too. Overall the kits were GREAT!”
“Your cars are incredible, they are so much fun and are a really effective way to show how an electric circuit works with a solar panel as the power source.”
“I just wanted to send a thank you for the fast shipping of the solar car kit I ordered. It is a blessing to get good value and fast service.”
“I’ve always appreciated how much your kits bring out the “maker” in kids! … I’m over the moon that we will get to be using them.”
“The kids LOVED these kits!”
Junior High School teacher in Ohio
“About our solar panels -By far the best that I have found”
The car kits did arrive in time. The workshop was a hit! Kids had a great time assembling the kits with their parents. After the workshop, we brought the cars outside and the kids experimented with adjusting the solar panels and changing the direction of the car. It was great to watch their young minds at work! Thanks for a great product!
“I really appreciate your concern with quality. It will ultimately make a better experience for our students. Thanks again!”
About our customer support: “Thank you so much for using your valuable time to help us even though we were unprepared. You do not know how much of a difference you made in our project. We think that your products are FABULOUS!!”