Astable Multivibrator Using 555 (50% Duty Cycle)

Design of Square wave of frequency 1 kHz with duty cycle 50% T = 1/f = 1ms Ton = 0.5 ms Toff = 0.5 ms Toff = 0.693*RB*C Let C = 0.1 microFarad, Then RB = 7215 Ohm = 7.215 kOhm Since Ton also we need same, i.e., 0.5 ms RA = 7.215 kOhm