Brightness Control of LED Displays Circuit

We can easily vary the brightness of a light emitting diode or seven segment LED displays by applying a pulsed signal and varying its duty cycle. If frequency of this signal is above 50hz flicker is not noticeable.

Parts List to make this Brightness Control System

C1 0.1uF

D1 1N4001

R1,R3 2.2k ohms,1/4W

R2 100k ohms, potentiometer

R4 220ohms,1/4W

R5 15k ohms, 1/4W

R6 10k ohms,1/4W

R7 2.2 Kilo ohms, 1/4W

T1 BC 148

Timer 555IC

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Complete component kit available in CKD form ( Components only without PCB )
Price : 75/- + Couriers Rs. 50/-

( Pl. send payment through at par cheque payable at Dehradun or DD in favour of
Cosy Communications )
we normally dispatch within 3 days from our works after confirmation of payment