Question

1. Consider the astable multivibrator circuit given in Fig. .6 with C = 100 nF and VCC = 5 V.

Fig. .6. Astable Multivibrator 555 IC
Determine the values of the resistors RA and RB to set f = 1 kHz and duty cycle = 60 %

RA = ...................... RB = ........................ Duty cycle = .......... %

2. Now consider the monostable circuit of Fig. .7. Assume RA = 100 k?.

Fig. .7. Monostable Multivibrator 555 IC

Determine C to get a monopulse of approximately 5 sec. C = ..........................

Answer 1