# circuit for LED using 230VAC 60hz

1. ## circuit for LED using 230VAC 60hz

help how to draw the circuit for led using 230vac 60hz

the circuit should applicable for dimmers

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2. ## Re: circuit for LED using 230VAC 60hz

if you connect a 1Mohm resistor, the led is protected enough with a high resistor

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3. ## Re: circuit for LED using 230VAC 60hz

but sir its ac so how can i make it not blinking

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4. ## Re: circuit for LED using 230VAC 60hz

Humans don't perceive a blink rate above ≈40 Hz so it won't appear to blink at 60 Hz.

This may be the schematic you want: AC-LED. Whenever you apply AC to an LED you need to protect it from reverse voltage with a diode in reverse parallel as shown.

This application note on transformerless power supplies may also be of use to you: http://ww1.microchip.com/downloads/e...tes/00954A.pdf.

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5. ## Re: circuit for LED using 230VAC 60hz

Originally Posted by bajgik
if you connect a 1Mohm resistor, the led is protected enough with a high resistor
If you used a 1Mohm resistor to limit the current, then you are going to create serious inefficiencies in the circuit. You will be dissipating a lot of wasted power through that resistor (I^2*R).

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6. ## Re: circuit for LED using 230VAC 60hz

An 100 or 120nF X2 rated cap with a series 1000 ohm surge limiting resistor (2W, 500V rated) will limit the current to near 10mA, put the LED in a bridge rectifier, (any 4 diodes with a V>5V and I>50mA will suffice) and this will work fine, for a triac dimmer input, worst case dissipation on the 1000 ohm will be 0.8 watt.
(for 5mA rms in the LED use 68nF X2 and so on...)

Regards, Orson Cart.

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