Amazing Oscilloscope Trickery
Having mis-spent a significant part of my youth tinkering with electronics, I was the 10 year old boy who wanted, and got an oscilloscope for my birthday. With the scope in X-Y mode and a couple of function generators, you could produce Lissajous figures by sending different waveforms to the X and Y inputs.
These talented hackers used the stereo output from a PC sound card to drive a scope and did some amazing tricks. It’s all still done on the X and Y inputs though.
