Avionics News April 2020 - 58

series
B Y

T H O M A S

I N M A N

Good
Multivibrations
I

n last month's Theory & Practice column, we
discussed the monostable multivibrator. The
circuit used the time constant from a capacitor and
resistor to hold a transistor on for a short period of time
before returning to its original, stable state.
This month, we discuss a similar circuit called an
astable multivibrator. As its name implies, this circuit
has no stable state. Instead, its output switches constantly
from one state to another. In other words, the transistors
on the output (there are two) constantly turn on and off. In
contrast, we also discuss a bistable multivibrator, which is

Figure 1
58

AVIONICS NEWS

*

APRIL

2020

a circuit that is stable in one of two states.
The version of the astable multivibrator described by
ASTM International's National Center for Aerospace
& Transportation Technologies uses isolation diodes
connected to the collectors of the resistors. If you Google
astable multivibrators, you will find not all schematics use
these diodes. There is an output at the collector of each
transistor, Q1 and Q2. R1 and R8 act as load resistors,
preventing the transistor from causing a short circuit when
turned on. The rest of the resistors and capacitors act
as RC time constants, controlling the symmetry and the



Avionics News April 2020

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