Homebrew PCBs

>--- Codesuidae <codesuidae@...> wrote:
>
>roger lucas wrote:
>> For those interested, the vibrating electrode is
>> driven by the solenoid arrangement in an aquarium
>> aeration pump. Simple, cheap and very effective.
>> However, production item may have to be a lighter
>> design to increase the oscillation frequency.

>Isn't the frequency of an aquarium pump determined by
>the power line 
>frequency?  In the designs I've seen its just a coil
>driven from the 
>power line pushing a magnet connected to a lever that
>moves a diaphragm 
>attached to a cavity with holes covered by small
>rubber flap valves.
>
>Dave K


Yes it is, if you connect it to the mains. However
there is nothing to stop you driving it with a
variable frequency oscillator and a high voltage audio
power module, or just a mosfet and dc.  Change the
magnet to a rare earth specimen and it fairly takes
off.

The rubber diaphragm has good damping. Result =
Variable Frequency electrode for less than \ufffd10.
Connect the the EDM PIC control and you can sync the
spark discharge to the 3 axis movement.

Roger


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