variable frequency generator? (to power a transistor)

[supak111]

I need a device that can operated say a transistor at variable frequencies, say between: 0-10kHz

I'm sure there are such electronics on the marker, what are they called? or would I need to build one? If so how difficult would it be?

 

[poor mystic]

What's it for please?

 

[davenn]

I need a device that can operated say a transistor at variable frequencies, say between: 0-10kHz

I'm sure there are such electronics on the marker, what are they called? or would I need to build one? If so how difficult would it be?

a function generator is the usual name for the unit. They usually have switchable sine, square or triangular waveform output with variable freq and level controls

Dave

 

[supak111]

I just want to play around with making a simple super fast RPM motor out of a neodymium magnet. I've seen people get the magnet going up to 500K rpm on YouTube

Thanks I'll look into "function generator". Square sine is probably what I need for the job and adjustable power output would be nice.

 

[(*steve*)]

I've seen people get the magnet going up to 500K rpm on YouTube

Really?

 

[supak111]

claims 500k rpm

claims 300k rpm

Everything seems to be right but who knows.


I have a question, what transistor would be a good choice for doing something crazy like this? I am planing on using a a cheap ebay function generator:
http://www.ebay.com/itm/New-DDS-Fun...373?pt=LH_DefaultDomain_0&hash=item257edf7bbd

to power a transistor which will power a coil. What transistor can handle say up to 100kHz and I'm hoping to power it by up to 100v

I'm probably gonna need a TV sized heat sink for it lol.

 

[poor mystic]

500k RPM translates to 8.3kHz, and I'd be scared of something spinning that fast - it might come to bits in an awful hurry.

 

[supak111]

yea I know that would be a lot of metal flying everywhere. I can't even imaging the G forces that are acting on the magnet at those rpms.

ps. ill just stand clear of the axis it spins on