Re: gEDA-user: Current sensor

[Mike Bushroe <mbushroe@xxxxxxxxx>]

   For not breaking the wire (assuming you can still insert it though a
   loop!) try something like this 100mA Flux Gate
   ([1]http://www.lemusa.com/docs/products/ct_e.pdf). If you CAN interrupt
   the wire, then there are many feed through chips that have the whole
   current flowing through them to bring it a precise distance away from a
   Hall effect sensor, that is then linearly amplified to an output
   voltage (powered by separate power lines) proportional to current
   passing through like this
   ([2]http://www.allegromicro.com/en/Products/Part_Numbers/0712/0712.pdf)
   Or, you could just the high and low sense lines to the inputs of a
   J-FET OpAmp. As the current changes direction, the inputs will swing
   from being + over - to being - over +, which should give a rail to rail
   output swing from the opamp without any measurable current drain from
   the circuit.
   Mike
   --
   Burn the Land,  Boil the Sea,  You can't take the SKY from me!

References

   1. http://www.lemusa.com/docs/products/ct_e.pdf
   2. http://www.allegromicro.com/en/Products/Part_Numbers/0712/0712.pdf


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