Mains operated LED night lamp
Description.
Here is a simple and powerful LED based night lamp circuit that can be operated directly from the 230V mains supply. The are total 24 white LEDs used and the lamp produces an output of around 15W.The resistance R1 and capacitor C1 provides necessary current limiting. The circuit is sufficiently immune against voltage spikes and surges.
Circuit diagram with Parts list.
Notes.
- Assemble the circuit on a general purpose PCB.
- The capacitor C1 can be polyester type.
- White LEDs are preferred in this circuit.
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This seems to be the simplest circuit I have seen so far as it does not use a rectifier.
Hello Seetharaman,
Thanks for the Information.
Regards
Hi Rohit use 0.47uF instead of 0.22uF, use 220 ohms 1/4 watt (will do) or 1/2 watt for 1k 3Watt. The power consumption will be around 2watts.
Hello Seetharaman,
I propose to use about 25 nos white LED in each group amounting to 50 nos. led (3.2v 25mA). I would be using 0.22mfd 400 volts and R1 as 100ohms 1 watt. The Power consumption would be approx. 3.5 watts.
Kindly suggest if this is okay.
Regards
Thanks SEETHARAMAN
Hi Jack 7LEDs (3.2 volt 30mA white or blue LEDs) back to back as in above circuit, that is 14 LEDs in all. the capacitor should be 0.47uF and R1 should be 220 ohms 1watts
Dear Seethraman,
I want to connect 7 leds 5mm(blue or white) what will be resistor and capacitor values. Thanks.
thanks Seethraman
Hi Saifur 2watts approximately.
what is the power consumption of this ckt? how watt?
I assembled the above circuit bu using 1500 volt capacitor and it is working fine..
thank you sir.
Hi Bilal 3.2 volt 25mA
what is the volt rating of single led
Hi Sison Connect 50LEDs back to back in series as above. Reduce R1 to 220 ohms 1 watt. change C1 to 0.47uF 400Volt. The only drawback is if you view the LEDs directly it will look like they are flashing. but illumination will be ok, you will not notice any flicker.
sir,
how can i increase the number of LEDs up to 100nos.what modification require?pls help
Hi Ravinder I have assembled with 30 LEDs, it consumes less than 1.5watts, as a night light it is ok. by reducing the resistance to 220ohms 1/4 watt you can further reduce. it was giving low filickering illumination due to each LED operating for half the cycle, as there is no rectifier and filter circuit.
Is the power consumption 15 W or is it the light output? If the circuit consumes around 2-3 watt, this would be excellent circuit for saving energy. Ravinder, Hyderabad, India.
Please circle I want a real metal detector at a depth of a remote
I assembled the above circuit. It is working excellent. I thank CIRCUITS TODAY very much for providing such a circuit. I want to analyze and understand the circuit. I measured the voltage past the capacitor and resister with a digital multimeter but no a.c.voltage is being shown. I connected a zero volt bulb also past the capacitor and Resister in the ciruit but it has not glowed. Why ?Since I am not a technical person, and for the benefit of memebers like me, I want somebody or the Designer to kindly explain how the circuit is working as to:
1) what is the voltage past the capacitor and the resister
2) what is the voltage of the all the LEDs put together
3) what is current in milliamps passing thrugh the LEDs
4) whether the capacitor and resister are considered to be
in series or in parallel, along with the LEDs.
5) why the glowing leds flicker even though it is not highly noticeable. Thanks in advnce. V.Gopalakrishna, Hyderabad, India.
a good site
good circuit,but doesn’t reduces the led life drastically ??
I would be pleased to know if any other capacitor would work.If any luck please mail me at aravindj36@gmail.com
What is the specification of the LED you have used in this circuit. If this information is given, it would be useful.