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Last Updated on: Thursday, April 07, 2016 02:04 PM

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More Current Monitors / Sensors / Detectors Circuits
 

AC Current Indicator Light  -  This circuit could be wired into a 120vac power line, which feeds power to any load, ranging from 40 watts to 250 watts.  It will turn on a LED light whenever current is being drawn by a load.  It is especially useful for remote lights, where you may not . . . [Hobby Circuit designed by Dave Johnson P.E.,  10/16/05]


AC Current Monitor  -  This circuit uses a small AC current transformer from Magnetek to produce an isolated voltage proportional to the AC current in the primary winding.  The transformer contains a single turn primary with a low 0.001-ohm resistance.  It can easily handle 30 . . . [Hobby Circuit designed by David Johnson P.E.,  07/10/06]


AC Indicator-Self Powered  -  Often there is a need to monitor when AC current flows into a load.  The circuit below works well for this application.  It uses an off-the-shelf torrid type AC-1020 current transformer from Triad, available from Mouser.  A wire carrying the AC current is . . . [Hobby Circuit designed by David A. Johnson P.E.,  12/30/07]


Bad Light Bulb Indicator  -  This request came from a Discover Circuits visitor.  He wanted to turn on a LED indicator light whenever a circuit detected a burned out tail/brake light on a car or truck.  The circuit shown below uses a transistor switch, to detect current flowing through a low value resistor . . . [Circuit by David A. Johnson P.E.,  12/17/06]


Clip-on AC Current Indicator Circuit  -  Several times over the last few years I have received calls from people looking for a simple circuit that would tell them when a sump pump or water well pump motor was running.  These people told me that the electrical circuits that turn on and off . . . [Hobby Circuit designed by David Johnson P.E.,  11/18/04]


Indicator for Bad Light Bulb  -  This request came from a Discover Circuits visitor.  He wanted to turn on a LED indicator light whenever a circuit detected a burned out tail/brake light on a car or truck.  The circuit shown below uses a transistor switch, to detect current flowing through a low value resistor . . . [Hobby Circuit designed by Dave Johnson P.E.,  12/17/06]


Monitors AC Current  -  This circuit uses a small AC current transformer from Magnetek to produce an isolated voltage proportional to the AC current in the primary winding.  The transformer contains a single turn primary with a low 0.001-ohm resistance.  It can easily handle 30 . . . [Hobby Circuit designed by Dave Johnson P.E.,  07/10/06]


Monitors Pump Motor  -  This circuit solves this problem in a novel way.  It clips on the outside of the pump motorís power cable and provides a transistor switch closure whenever the circuit detects current flowing to the motor.  The circuit draws so little current that a small lithium cell will power the circuit for years . . . [Circuit Solution by David A. Johnson P.E.,  11/18/04]


Pump Motor Monitor  -  This circuit can turn on a light or sound a beeper, whenever an AC line powered pump motor turns on.  It is designed to detect the motor current using a small inductor placed on the outside of the motorís power cable.  No direct wire contact is needed . . . [Circuit by David Johnson P.E.,  11/18/04]


Self Powered AC Indicator  -  Often there is a need to monitor when AC current flows into a load.  The circuit below works well for this application.  It uses an off-the-shelf torrid type AC-1020 current transformer from Triad, available from Mouser.  A wire carrying the AC current is . . . [Hobby Circuit designed by David Johnson P.E.,  12/30/07]


Self-Powered AC Current Indicator  -  Often there is a need to monitor when AC current flows into a load.  The circuit below works well for this application.  It uses an off-the-shelf torrid type AC-1020 current transformer from Triad, available from Mouser.  A wire carrying the AC current is . . . [Circuit by David Johnson P.E.,  12/30/07]

More Current Monitors / Sensors / Detectors Circuits

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