How to Make an LED AC Voltage Indicator – Project Do it Yourself

A simple construction and accurate result are
the main features of this tiny circuit. Learn 
how to make ac voltage indicator from led in a most simple and easy to
understand method.
  The AC mains line that we get in our household electric
socket outlets, may at times be full of dangerous fluctuations. These may
either be in the form of a sudden high voltage or a low voltage. Both the
situations can be very “fatal” to our sophisticated electronic equipments like
TVs, DVD players, refrigerators, computers etc to name a few.

A simple electronic part such as an LED can play an
important role in displaying the condition of this AC mains voltage and warn us
of a possible electrical hazard.
Yeah, we will exactly learn how to make ac voltage indicator using leds through a construction of a little electronic circuit.
Parts Required
You will need the following mentioned parts for the project:
TRANSISTORS T1, 2, 3, 4, 5 = BC547
ZENER DIODE Z1—-Z5 = 3 VOLTS / 400mW
RESISTORS R 1—R10 = 1 K ¼ WATT, CFR.
CAPACITOR C1 = 1000uF/25v,
DIODE D1 = 1N4007
LED 1, 2, 3, 4, 5 = RED 5mm DIFFUSED
PRESET P1, 2, 3, 4, 5 = 47K LINEAR
GENERAL PURPOSE BOARD = 6” BY 2”
TRANSFORMER = O – 6 VOLTS/ 500mA
How to Construct the LED AC Voltage
Indicator
It is completed through the following
few easy steps:
In the procured
general purpose board, with the help of the circuit schematic start inserting
the transistors first in a straight line and solder their leads.
Similarly insert and solder the resistors, zener diodes,
LEDs, capacitors, presets etc. in an organized manner and solder them with
reference to the circuit diagram.
How to Test the Circuit?

The following testing details will furthermore help you to
understand exactly how to make ac voltage indicator from led:
For testing the completed circuit board you will require a
transformer with multiple voltage outputs.
Connect the transformer to the AC mains; also connect the
common secondary output of the transformer to the negative point of the
circuit.
Make an alligator clip/ wire assembly. Solder the wire end
of the clip to 1N4007 diode input.
Now bite the clip to the 3 volt output of the transformer,
adjust P1 so that the first LED just starts glowing.
As above go on connecting the clip to 6, 7.5, 9 and 12 volts
of the transformer and adjust the presets P2, P3, P4 andP5 so that the relevant
LEDs just start to glow at the respective voltages.
This completes the testing and the setting of the circuit.
Finally join the 6 volt transformer to the circuit and
switch ON the power. You will find that LED 1, 2 and 3 are glowing brightly,
LED no.4 is glowing with less brightness while the last LED is completely OFF,
indicating a safe level of AC mains voltage.
Now in case the voltage exceeds a high level (above 260
volts) the last LED will start glowing brightly indicating a dangerous
situation.
If the voltage drops to a dangerous level (below 160 V) LED
3 and may be LED 2 may cease to glow, again indicating a bad low voltage.

6 Replies to “How to Make an LED AC Voltage Indicator – Project Do it Yourself”

  1. I AM TRYING TO BUILD A LOW VOLATGE INDICATOR FOR AN 18 VOLT BATTERY AND THE LED NEEDS TO LIGHT AT 16 VOLTS USING THE LM324. CAN YOU HELP ME OUT? IT JUST STAYS ON AND DOES NOT GO OUT ABOVE 16.1 VOLTS

  2. Good after noone Sir!
    Is it not good idia to develope this circuit in order to use more of it?I mean,as soon as voltage exceeds 260v and drops blew 160v,the AC line go to the "off" position.Is that not helpfull for the needy people who can not afford to buy voltage stabilizer?
    God bless you more and more for your nice work!

    1. thanks, below 160V and over 260V are unsafe zones so as soon as this is detected, the user can simply switch OFF the mains….so the above circuit definitely can be useful if used sensibly

Leave a Reply

Your email address will not be published. Required fields are marked *