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LED dimmer circuit using 555 timer

This led dimmer circuit is based on a 555 timer circuit and require few external electronic parts . This LED dimmer circuit will adjust the brightness of one or more LEDs from 5% to 95%.
The brightness of the LED is determined by the on time vs. the off time of the square wave output.
This circuit is very simple and will not require any future adjustments, if you’ll turn the 50k potentiometer , the brightens of the led will be modified.

Circuit Diagram: 
LED dimmer circuit using 555 timer


THIS CIRCUIT IS INCORRECT. One of the 1N4148 diodes MUST be opposite polarity of the other 1N4148 for the circuit to operate correcetly.

Which type of transformer you are using ? Plz mention the specification

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