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AC current monitor circuit

2015-01-21 23:13  
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This article describes the AC current monitor circuit. The circuit is relatively simple, it is easy to grasp. Here you'll read the following diagram combine text it! The upper left corner of the drawings shows the basic circuit, must be used for all three versions. IC1 acts as a differential amplifier has increased by 220. Small AC voltage, so recipients L1 amplified to a value that can drive LED D1. The second version is to attract the lower left, must be connected to the basic circuit and uses a dual op amp, therefore IC1 will be labeled IC1A its pin connection is slightly different. IC1B acts as a voltage comparator and its threshold voltage can be precisely set by trimming R6. The first quarter is the relay driver and D2 lighting when the relay. You can use the relay contacts to drive an alarm or light when the AC load exceeds a preset value, such as two kilowatts. The third version is shown on the right figure, must be connected to the basic circuit and the use of four operational amplifiers IC1 will be labeled so IC1A its pin connection is slightly different. IC1B, C and D have the line as a comparator. They led the switch, refer to the non-inverting input voltage at a set voltage divider resistor chain r11 r14. This sensor coil L1 is a common 10 mh miniature inductor, there is a small rectangular plastic box 10 x7x4 mm and radial leadership. The sensor must be placed tightly line of power cables, leaving some of the other lines cm away. Sensitivity will be doubled, if the inductor is placed tightly between two wires as shown, upper left corner. Conversely, do not connect the inductive signal is often paired canceled and the circuit will not work. LED limiting resistor R5 should have a value included in the 100 r - 1 k range, the output voltage available. D1 and its limiting resistor R5 may be omitted leading in versions 2 and 3 of the circuit. Version one and three draw a small current, so that the possible 9 v battery operation if you want a thorough understanding of the principles of the circuit, I suggest you can go to find out the important components of the circuit: TL061  and LM324. 

AC Current Monitor


R1,R2,R8____________1K   1/4W Resistors
R3,R4_____________220K   1/4W Resistors
R5________________100R   1/4W Resistor (See Notes)
R6_________________10K   1/2W Trimmer Cermet
R7,R10______________1M   1/4W Resistors
R9_________________22K   1/2W Resistor
R11 to R17__________1K   1/4W Resistors

C1,C3_____________100μF   25V Electrolytic Capacitors
C2,C4_______________1μF   63V Electrolytic Capacitors

D1________________5mm. Red LED
D3,D4___________1N4002  100V 1A Diodes
D2,D5,D6,D7_______LEDs  (Any color and size)

Q1_______________BC327  45V 800mA PNP Transistor

IC1______________TL061  Low current BIFET Op-Amp (First version)
IC1______________LM358  Low Power Dual Op-amp (Second version)
IC1______________LM324  Low Power Quad Op-amp (Third version)

L1________________10mH  miniature Inductor (See Notes)

RL1______________Relay with SPDT 2A @ 220V switch
                 Coil Voltage 12V. Coil resistance 200-300 Ohm

J1_______________Two ways output socket


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