Hi John
I understand that he was expecting he's invention could make him money and was keeping its workings to him self ,i think they all had enough of him at the end when he would not answer questions put to him .
Yes we like making stuff from junk now and again it works free to view and copy
Well i was thinking sponge or wood perhaps any thing that reflects the utrasonic wave is not good ..just had me wondering i don't think thats hard ....i hope ... trial and error will work that out .
Thanks ! think a thicker crystal you need amplifying ....i wonder if it would work at double the frequency as your going for 10mhz i think if it would work in the 20's perhaps a simple CB radio would work ? you have the modulating and you have the high RF ...feeding the crystal ...just an idea....unless you have a ham radio transmitter that does 10mhz handy ?
On the HD motors i saw one guy try and run them sort of got it going but they needed a push start so i never really looked more into it ...i was and did at the start use the control board fitted but i was using to much weight for nipkows at the start and the
motor aways died after a while ...but for the
polygon yes that should be no problem ..i am in the habit of using normal dc motors and rubber bands i am in a rut
but.....am into stepper motors now as well .
Yes the HD platter is a mirror finish ! but if you cut them you have to polish and i am not sure its not just a coating on the platter ..
You could mask off lines around the platter and paint the rest black remove the tape line and have a sort of front reflecting lines need another rotating mask infront of that never know you must have a lot of spare HD platters about in your work shop like me ...one day !!!!!
OH Before i forget i did some experiments on mica not only does if reflect a laser light like a mirror is passes it as well same time it would make an interesting mirror screw if you could get enough of the stuff but i have only seen mica as transistor heat sinks ...in one of my passed posts it was used for light modulation you could double reflect the light via the stuff.