azonenberg changed the topic of #homecmos to: Homebrew CMOS and MEMS foundry design | Wiki: http://homecmos.drawersteak.com/wiki/Main_Page | Repository: http://code.google.com/p/homecmos/ | Logs: http://en.qi-hardware.com/homecmos-logs/
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<Noxz> any homemade ultrasonic homogenizers? I'm looking to dabble with making graphene via water/heptane interface barrier
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<nmz787> i've looked into them before to do cell lysis for protein recovery, but I didn't find much at the time. Recently I saw some page talking about making your own piezo positioner, and I think it was talking about sourcing pizeo ceramic then adding their own electrodes on.
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<SpeedEvil> large watts ultrasound thingies are available
<_Sync_> they have been since a while
<_Sync_> although the drivers that come with them are suuuuper dangerous
<chris_99> dangerous how?
<SpeedEvil> mains isolation
<SpeedEvil> Or lack
<chris_99> oh heh
<chris_99> could you do ultrasonic welding with those i wonder
<SpeedEvil> 'yes'
<SpeedEvil> with a suitable horn
<chris_99> is the horn essentially just plastic or whatnot to focus the beam
<_Sync_> alu mostly
<chris_99> aha
<SpeedEvil> It's an internal focus
<SpeedEvil> the ultrasound bounces around internally to the metal - not externally
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<Noxz> I was not planning on making the transducer, just the powersuppply/singla generator (as the chinese ones look like garbage) and maybe the acousti/ultrasonicc horn from some machine shop (440 stainless steel I think was listed as a common material used for that)
<_Sync_> simulating the horn is an art tho
<Noxz> eh, just find a patent or dimensions in some book and copy them ;)
<Noxz> I dont want to desgin an ultrasonic machine fromt he ground up, I just want one on the cheap
<_Sync_> well
<_Sync_> the thing is, the chinese ones are not made to be coupled into a sonotrode
<Noxz> tranducer or signal generator?
<_Sync_> the transducers
<Noxz> the transducers with a scre terminal or whichever is capable
<Noxz> screw hole
<_Sync_> http://www.powerultrasonics.com/content/sonotrode-calculator that actually doesn't seem so bad
<_Sync_> although it can't do much
<Noxz> the method I referenced, heptan/water with graphite to make graphene, did 40% of a 750W machine, so an output of 300W is my goal
<Noxz> from, say, a 100W transducer
<Noxz> agh, gotta get ready for work
<Noxz> always getting in the way of fun
<_Sync_> although apparently you need to tune them individually
<Noxz> I was assuming some sort of PLL
<Noxz> for feedback
<Noxz> laters
<_Sync_> that does not help
<_Sync_> you need the resonance frequency of the sonotrode to be the same as the transducer