230V TO 1 WATT LED DRIVER (tested OK)
Driving a 1W LED with mains is a simple thing. But to glow the LED with its maximum light efficiency,long life, and less cost etc are not so simple. We need 300-350 mA,with 3.6 volt to drive the LED with its maximum efficiency.When we try to increase the ampere in a transformerless supply,initial surge also will increase, which may damage the LED. If we use Zener to control the voltage ,may result in zener damage because of heating of zener.Those who do experiments with transformerless power supply may experienced such damages due to over heat ,In this circuit, 5 diodes are connected between positive and negative pole for getting an out put of 3.5 volt approximate. Since 1N 4007 can handle 1amp at 1000V, gives better result than zener.10uf/250 V electrolytic capacitor can prevent surge voltage to some extent.This circuit can deliver 250 mA ,but you can use additional capacitor for getting more current(upto 350 max) and light intensity accordingly.
click circuit
5 series diodes get little heat while lighting LED,but quite normal.even, provide little ventilation .
Always remember you are with live mains. Do not touch any of the points when connected with mains supply.soldering or repairing the circuit should not be done if the mains connection is not removed
Thanks & Regards
Vineesh Kodambattil
