PSN-L Email List Message
Subject: Combination spring-mag_levitation Anyone Tried This ??
From: "Geoff" gmvoeth@...........
Date: Wed, 5 Dec 2007 20:41:46 -0700
Hello PSN Folks;
Has anyone ever used a spring
to take up most the mass weight then
maybe apply an ounce or less levitation
magnetically to set with electronics
the free period within a geophone.
Id think you would pump a current limited signal
into the geophone and use some kind of
feedback circuit that might set
the free period. I am looking only
for a free period in the 3 to 4 second
If you take up the small weight with your hand
it seems you can move the hand up and down
at whatever period and the system will
not oppose what you are doing ??
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