Voltage controller?

[rr]

I'm having some trouble following what you are saying. Can you post the
URL for the Aqua-mist site?

It sounds like the pump itself has some sort of controller built in,
that needs another controller to run?

As far as the 0-12v at 5ma signal, and the level, it would depend upon
what the digital level detector's are set to, as to whether a lower
voltage would work or not.

BobR.


> 
> rr wrote:
> > 
> > Dan,
> > 
> > If you wanted to convert the 5v MAP to a 12v signal, relative, use an
> > op-amp. Just use an amp with a gain of 2.4 (12 / 5). Use this in the
> > non-inverting configuration. The only problem with this is head-room,
> > most amps won't go to the plus rail.
> > 
> > A better approach might be PWM. Look in the 'incoming' directory for
> > the files: PWM2.gif  and PWM2.txt (not sure of the exact case).
> > 

Dan wrote:
> 
> Thanks, I just found that on the ftp site this morning.  I think that'll
> do what I want.  I got on the ERL site to do some more checking.  They
> say the pump is controlled by varying frequency and duration of the controlling
> pulse.  In the specs for the pump, they list an Input voltage of around 14V,
> Input current of 8A, and a control input of 0-12V @ 5mA(digital).  This 
> would be a PWM signal right?  Does the voltage in this case of the control
> input matter?  Since the motor has a seperate power source wouldn't a particular
> pulse frequency @ say 4V have the same result as the same pulse @ 8, 10 or
> 12V?
> 
> thanks

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