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Toss the current transformer in the junk bin and get a hall-effect current sensor ffom Allegro Microsystems.They have high isolation, handle AC or DC, come in a wide range of current capacities, output a DC voltage proportional to current, and are rather inexpensive.
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i would, but as i mentioned in previous threads, i need for it to not interfere with the primary path. the hall effect devices require you to break the primary path and route it through the IC.
DT, just to satisfy my natural curiosity. what effect will you experience if you were to have an inductive load on the primary with a precision rectifier on the secondary?
Last edited by docwisdom; - 2nd May 2008 at 18:26.
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You would get the wrong amperage reading.what effect will you experience if you were to have an inductive load on the primary with a precision rectifier on the secondary?
If you calibrated the device with a resistive load, so that it reads the correct current with light bulbs etc. When you plug in an inductive load like a motor, the readings will be much lower than they should be. They will vary from one inductive load to the next. And even the same load at different current levels will be in error by different amounts.
If you plug in a Light Dimmer, Motor Soft-Start or speed control, The thing will go absolutely NUTS from the "Chopping" of the SCR or Triac.
All of those problems are resolved by using the RMS converter. Which gives the correct amperage under ALL conditions.
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DT
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Cool,
Ill give the RMS converter a shot.
-edit-
seems LTC1966 is discontinued.
found this http://search.digikey.com/scripts/Dk...me=AD736JNZ-ND
Last edited by docwisdom; - 3rd May 2008 at 04:16.
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Hmmm, well that's unfortunate.Originally Posted by docwisdom
I really liked that chip.
I'm sure any other "True RMS to DC" converter will do just as well. It's the RMS that counts.
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DT
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The LTC1966 does not appear to be discontinued just not in stock. DK can have one in a couple of days.
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hm, cant seem to find the page where I saw the word discontinued.
anyway. what do you do to put the smd on a breadboard?
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