Figure 3-29.Block diagram of a flip-flop with a toggle input.
Figure 3-30.Flip-flop with three inputs (block diagram).
Remember, a SET input will SET the flip-flop if it is in the
CLEAR state, otherwise, it will not do anything; a trigger at
the CLEAR input can only CLEAR the circuit if it is SET; and a
trigger applied to the TOGGLE input will cause the bistable
multivibrator to change states regardless of what state it is
in. Q7. In a bistable multivibrator, how many trigger pulses are
needed to produce one complete cycle in Q8. How many stable
states are there for a flip-flop? Q9. If a voltage (positive or
negative) is measured on the "1" output of a flip-flop, what
state is it in? The BLOCKING OSCILLATOR is a special type of
wave generator used to produce a narrow pulse, or trigger.
Blocking oscillators have many uses, most of which are concerned
with the timing of some other circuit. They can be used as
frequency dividers or counter circuits and for switching other
circuits on and off at specific times. I