Circuit board project

[desolation777]

For a project of my class, we have to build a circuit quiz. THe setup is d volt batteries connected to copper wiring which is connected to a rod. When u use the stylus (rod) and touch a choice, it completes the circuit. What i need to know is how add sound for when you get a correct answer. My idea was to use the speaker from a singing greeting card but so far i ahvent found a way to do it. Any help would be greatly appreciated.

 

[Aluvus]

A piezoelectric speaker will make noise when a DC voltage is connected across its terminals. That is probably the simplest solution.

 

[desolation777]

problem is i dont have time to order from anywhere :/

 

[PottedMeat]

Can you just use a LED instead of sound?, there are lots of LEDs you could rip out of old electronics.

Otherwise, you would have to find a buzzer out of a door bell or old smoke alarm.

 

[desolation777]

Thats not a bad idea. Im already using old xmas lights for the project but didnt think of an alarm. Thanks pottedmeat

 

[Leros]

Im sure you can get a piezo from Radio shack.

 

[bobsmith1492]

Heh I made one of these on a piece of cardboard for a science fair when I was 8. 🙂 6-volt battery and light bulbs from Radio Shack for indicators. A buzzer from RS would work, too.