220V Mains Quality Monitor

Posted on Oct 3, 2012

With this circuit you will be able to monitor the quality of the mains. There are 4 distinct sections, each supervising a parameter pertinent to the quality of the supply line. The noise section consists of a 50Hz filter and a speaker where you will hear the noise present on the line. The bicolor LED should be adjusted for the least light with the 5k pot and gives a visual indication of noise or asymmetry in the wave. The second section will detect any spike which is overimposed on the mains voltage: adjust the pot so that it will not trip if you just switch on the light, sensitivity is high enough to detect a switching operation from a close neighbor.

220V Mains Quality Monitor
Click here to download the full size of the above Circuit.

The buzzer will beep for about 1sec anytime there is a spike. The actual voltage is detected with section 3: the yellow led will blink at a rate of 6 Hz but will visibly double to 12 Hz for a 10% increase or will come to a halt for a 10% decrease of the voltage. The last section will show the flutter or slow variations of the mains voltage. The circuit will work for a 220V mains: for 230V operation, change the 27V zener to 39V and for 60Hz operation change the 3.9k resistor to 3.3k and the 47k resistor to 39k. Operation at 110V will call for a major redesign of the component values and has not been attempted.

Leave Comment

characters left:

New Circuits



Popular Circuits

disco lighting
60W Power Amplifier with 2N3055
Data Based IQ Demodulator
Amplifier Timer
arduino How can I display a scoreboard on stage for a play
Toy Motor Drivers
display and serial interfacing of
Introduction to PWM Inverters
Pulse Width Modulation DC Motor Controls
5V Power Supply For On-Train Radio Camera
Selfrunning Free Energy 5 KW Kapanadze 8
The Mainline TT/L FSK Demodulator
NTC protection circuit three-phase asynchronous motors
Alternating current voltage amplifier transistor