How about using a Wien bridge or something to generate the wave?
Alternatively, what about a PWM of some sort? Would just strobing a pulse
through the coil at regular intervals be enough to cause a vibration? In that
case you could just use a simple RC circuit or something.
- Marcel

"Harold Hallikainen" <harold@hallikainen.com> wrote:

> 
> > On Thu, 2005-09-29 at 15:23 -0700, Harold Hallikainen wrote:
> >> I have an application where I need to drive a diaphragm pump (like those
> >> used in aquariums) from low voltage DC (battery). Here in the US, these
> >> pumps are mechanically tuned to run directly off the 60 Hz line. A
> >> single
> >> coil on a core moves an armature that has a couple magnets on it. The
> >> armature moves back and forth at 60 Hz, vibrating the diaphragm.
> >
> > This may be too simple, but why not just purchase an inverter? It sounds
> > like this device doesn't use that much power, and inverters of smaller
> > wattages are very cheap these days.
> >
> 
> 
> We're going to be shipping several thousand units a month. The pump is
> about $5.00 I'm trying to keep costs down.
> 
> Thanks for the idea, though! Keep 'em coming!
> 
> Harold
> 
> 




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