/diy/ - Do It Yourself

>>800569
I always just put one of the outputs into another transistor. Works well enough. Here that is at 155 kHz. Rise time to 3.2V is roughly a microsecond. It doesn't get much longer if you use a higher voltage either. Not the cleanest thing ever, but it works for a lot of stuff.

Neat trick though.

Also
>owns an oscilloscope
>has never built an oscillator

:|

>>800822
I don't know about breadboard kits, but wireless power using an air core transformer could be really cool for kids. The circuits are relatively simple, and winding your own TX/RX coils is fairly easy (though the math can be a trick). Maybe if they're old/smart enough, it's an opportunity to teach them a little bit about inductance and electromagnetics.

>look mom, it lights up with no wires!
They'd go nuts.