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Pulse and Digital Circuits by Manmadha Rao G., Rama Sudha K., Venkata Rao K.

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15.3 SYNCHRONIZATION OF OTHER RELAXATION CIRCUITS

Frequency synchronization and division is also possible using other relaxation circuits such as astable multivibrators and monostable multivibrators. We will consider the blocking oscillator circuits and conventional astable and monostable multivibators.

15.3.1 Synchronization of Astable Blocking Oscillators

Synchronization of the output of an astable blocking oscillator with frequency division by a factor of 5 using positive sync pulses is illustrated in Fig. 15.5(a). Q2 acts as an inverter. The positive sync pulses that appear at the base of Q2, after amplification and polarity inversion by the CE configuration, appear as negative pulses at the collectors of Q1 and Q2. Because of the polarity ...

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