OK.
I was looking at the ringing choke option & was trying to figure out
what size capacitor may be required for 60Hz resonance.
I think that it could be a reasonable option - and wouldn't require a
coil rewind which is another plus.
You may have to tune the capacitor value so that the resonant
frequency matches the mechanical resonance.

Other drive alternatives (using a rewound coil) could be a 1/2 or full bridge.

If you can find a centre tapped wall-wart or similar transformer a
simple push-pull  may be an option too.

RP

On 30/09/05, Harold Hallikainen <harold@hallikainen.com> wrote:
> I'm waiting to get a sample. I understand it takes about 6W at 120VAC 60Hz.
>
> Harold
>
>
> > Any idea on the power level / onductance / resistance of the coil?
> > RP
> >
> > On 30/09/05, Rob Robson <rob@silk.net> wrote:
> >> I'd be inclined to hang the pump off a variac to see how little AC
> >> amplitude
> >> you could get away with.  Also, the pump's coil might not be too
> >> thrilled
> >> with square waves, so you might have to do what the cheaper commercial
> >> 12V-to-120VAC inverters do and simulate a sine wave with a two-step
> >> staircase.  Just some thoughts.
> >>
> >> RR
> >>
> >>
> >> ----- Original Message -----
> >> From: "Harold Hallikainen" <harold@hallikainen.com>
> >> To: "Microcontroller discussion list - Public." <piclist@mit.edu>
> >> Sent: Thursday, September 29, 2005 4:10 PM
> >> Subject: Re: [EE] DC drive to aquarium diaphragm pump ideas?
> >>
> >>
> >> >
> >> >> ....
> >> >>
> >> >>> Any ideas?
> >> >>
> >> >> a small DC motor that you run at 60*60 RPM that moves a piston rod
> >> back
> >> >> and
> >> >> forth that physically toggles a switch between positive and negative
> >> >> voltage.
> >> >>
> >> >> - Marcel
> >> >
> >> >
> >> > Pretty elegant! Actually, if I had the DC motor, a crank on it could
> >> run
> >> > the diaphragm directly. Turns out this pump is incredibly cheap
> >> (cheaper
> >> > than a motor), so I'm trying to figure out a cleaver way to drive it..
> >> >
> >> > Thanks for the ideas... Any more?
> >> >
> >> > THANKS!
> >> >
> >> > Harold
> >> >
> >> >
> >> > --
> >> > FCC Rules Updated Daily at http://www.hallikainen.com
> >> > --
> >> > http://www.piclist.com PIC/SX FAQ & list archive
> >> > View/change your membership options at
> >> > http://mailman.mit.edu/mailman/listinfo/piclist
> >> >
> >>
> >>
> >> --
> >> http://www.piclist.com PIC/SX FAQ & list archive
> >> View/change your membership options at
> >> http://mailman.mit.edu/mailman/listinfo/piclist
> >>
> >
> > --
> > http://www.piclist.com PIC/SX FAQ & list archive
> > View/change your membership options at
> > http://mailman.mit.edu/mailman/listinfo/piclist
> >
>
>
> --
> FCC Rules Updated Daily at http://www.hallikainen.com
> --
> http://www.piclist.com PIC/SX FAQ & list archive
> View/change your membership options at
> http://mailman.mit.edu/mailman/listinfo/piclist
>

-- 
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist