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Mains Voltage Indicator with a LED.

I need an AC line 220V light display or main voltage monitor. Because the home ‘s electric of his brother a very often problem. Below a figure is the 230V AC voltage indicator circuit. We use the LED for display the power ac line, because cheap and convenient. The other devices, nothing more.
The R1 resistor act to reduce the current and a short circuit protection similar fuse. The C1 is the capacitor the current depression. It works well. When used with AC power. And rarely have problems with heat. The D1 diode is used to protect feedback voltage for LED1.

Mains Voltage Indicator with a LED.

Important, you choose C1 is only the high voltage about 630V. Be careful, direction contact with into circuit can cause electrical shock.

LED display ac line indicator circuit

This circuit is compatible with the main power is 115 Vac or 230 Vac.It shows that the power grid or not.And while the switch will still hold the power or not.
Operation of the circuit. be This circuit is the main indicator of power while not pressing the switch S1. Will have current flowing through R1, D1,LED1 will light up to reflect the input of the power is. But when the press switch S1 will flow through R2, D2,LED2. It makes LED2 light and also a part of current flow to trigger B pin of Q1. It makes Q1 work as a short LED1 to ground. Makes LED1 off.

LED Indicator for remote AC loads

The LED Indicator for remote AC loads Circuit. At very cheap and use electronic part the a little. This circuit uses diode rectifier cheapness , Resistor and LED only. As a result assemble the circuit shows flowwing of AC current Source in load easily. Although intend to design for apply to office implement with main electric , but we may modify this idea goes to are usable with the level low voltage get not difficult please.

LED Indicator for remote AC loads

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Comments (14)

  • mdsham

    One Response to “LED Indicator for remote AC loads”

    Hi,

    How are you friend?

    I,m interesting with your LED indicator for remote AC load.can you tell me the LEd will lip up based on how many AC amp load?

    I confused the LED type in your project it’s normal DC LED? Can i replace the LED with AC Bulb?

    Thanks,

  • Chris

    Could you please contact me regarding this? I’m interested in this and also a DC equivalent but with the source a max of 80VDC.

  • Chris

    How do I power a simple indicator LED with a wide AC input range (250VAC max) and I also have another circuit with wide DC input range (80VDC max)?

  • Ted W

    Chris the voltage drop across the LED is minuscule compared to the high voltages. Subtract 2(red and yellow LED’s are normally 2 volts) or 3 volts from the AC voltage and use V = IR to use about 4 ma. That’s a 33K resistor on 120 volts and 68K on 240.

    In the last circuit example, why are you rectifying 120 or 240 volts and sending it to the Load? Who needs that much DC voltage?

  • Ted W

    PS: That’s with 1/2 watt resistors. More milliamps means more watts. 8 ma(.008 amps) would require one watt resistors.

  • Ras

    Mains indicator with LED

    Thanks for your circuit!!

    It works perfectly.

  • Rick

    Just read on another web page for a 220V AC LED cct .. have the LED and a reverse connected IN4003
    and instead on nay resistor just use a 0.22uF Ceramic capacitor.

    Have you tried this ?
    States it avoids problem of dissipating heat in a resistor.
    Take a look at:
    http://www.instructables.com/id/LED-on-AC-Mains/

  • Rick

    Been looking a bit more into this … In your diag you show the 4k7 1W resistor.
    You can simply leave that out … the capacitor is providing current limit.

    You mention resistor is there for current limit in the event of a short.
    A short where ? in capacitor ? if that is case LED would act as fuse.

    Have you calculated what current is flowing thru resistor in normal state ? ……..
    I am thinking of simply discarding that resistor ..

  • Prashant nayak

    1 have added 60 led in one circuit please tell me how to connect with direct ac 210v to 240v plzz help me
    i want to fix in my aquarium….
    thanks

  • Muzakki Ea

    for the Mains Voltage Indicator with a LED,can i use 2000V 223nF capacitor?

  • Mia

    Question for “Mains Voltage Indicator with a LED”. I wanted to add it in our refrigerator plug. We only power off our refrigerator at least once a month for 30 minutes.

    1.) Will the circuit conneceted to our refrigerator will actually survive for at least 1 year?

    2.) In C1 what is current depression

  • Mia

    Question for “Mains Voltage Indicator with a LED”. I wanted to add it in our refrigerator plug. We only power off our refrigerator at least once a month for 30 minutes.

    1.) Will the circuit conneceted to our refrigerator will actually survive for at least 1 year?

    2.) In C1 what is current depression in easy-to-understand explanation? Is that the only purpose in this circuit?

    3.) If circuit is connected directly to welding machine power plug (also as power indicator) will it survive for a whole day welding-heavy-usage used?

    Thank You,
    mia

  • makhon barooah

    very helpfull hobbyist and students.

  • momename

    Hi,
    Thanks for your feedback.

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