Homebrew PCBs

--- In Homebrew_PCBs@yahoogroups.com, Stefan Trethan
<stefan_trethan@g...> wrote:
> What you describe there is a simple membrane pump.
> thousands sold each year (a lot of them for air pumping).
> i tried it with a speaker @50hz, speaker diameter about 12cm.
> the membrane hat to be sealed (used silicone).
> with air id did make some suction (wanted it for vacuum-bag lamination).
> but not very much, very low efficiency. (@50hz)
> (membrane pp amplitude was 5mm  - then it smoked, stopped to move and i 
> discarded it ;-))

Phew, I don't feel so bad then.

I wouldn't expect a diaphram style pump to be very good at pulling a
vacuum.

Steve