AquaMist pump (was: Re: Voltage controller)

[Ord Millar]

555 is a timer.  Pretty handy, with two resistors & a capacitor you can make
a pulsing output, and the frequency is pretty stable when supply voltage
changes.  It can also be used for a one-shot pulse, amoung other things.
Also comes in a dual version, 556.   You can find them in TI data books,
also Signetics, usually listed under "Special Function".  No one should be
without a few!

>
>Someone mentioned an op-amp could do this.  Also a 555.  What is a
>555?  Is that a particular op-amp?  I remember it being referred to as
>a timer someone used to drive and additional injector from the signal
>to a stock one.
>
>For now I'll start studying op-amps.  Thanks for the help.
>
>--Dan
>