build electronic toys

[Plane]

Oh this looks like fun!

For ages 8 and up.

http://www.ecnmag.com/Blogs/2011/12/I-Love-The-Sound-Of-Hetrodyne-Whistles/?et_cid=2364664&et_rid=45566411&linkid=http%3a%2f%2fwww.ecnmag.com%2fBlogs%2f2011%2f12%2fI-Love-The-Sound-Of-Hetrodyne-Whistles%2f


     By the way , hetrodine is actually pretty simple , if two frequencys are fed to the same amp the amp will produce at least four frequencys, the origional two frequencys , the frequency equal to the sum of the two and the frequency equal to the diffrence of the two.

    Hetrodine is a usefull principal in audio and radio , it is a simple means of converting from one frequency to another the new frequency will be just the same modulation as the origional.