Pulse and Digital Circuits

14.2 MONOSTABLE BLOCKING OSCILLATORS

A pulse transformer is used as a coupling element in a blocking oscillator to provide positive feedback. If the blocking oscillator generates a single pulse, the circuit is called a monostable circuit. Monostable blocking oscillators can be of two types: Monostable circuit with base timing and monostable circuit with emitter timing. In a monostable blocking oscillator using base timing, the timing resistance R (a component that controls the gate width) is used in the base circuit of the transistor. This circuit, however, does not ensure stable pulse width. Alternatively, the timing resistance R is shifted to the emitter circuit of the transistor in the emitter-timing monostable blocking oscillator. This in ...