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.pdf  CI-03_June05.pdf (Size: 121.59 KB / Downloads: 214)

Do you want to get an early
warning of brake failure
while driving? Here is a
brake failure indicator circuit that constantly
monitors the condition of the
brake and gives an audio-visual indication.
When the brake is applied, the
green LED blinks and the piezobuzzer
beeps for around one second if the
brake system is intact. If the brake fails,
the red LED glows and the buzzer
stops beeping.
The circuit will work only in vehicles
with negative grounding. It also
gives an indication of brake switch failure.
In hydraulic brake systems of vehicles,
a brake switch is mounted on
the brake cylinder to operate the rear
brake lamps. The brake switch is fluidoperated
and doesn’t function if the
fluid pressure drops due to leakage.
The fluid leakage cannot be detected
easily unless there is a severe pressure
drop in the brake pedal. This circuit
senses the chance of a brake failure by
monitoring the brake switch and reminds
you of the condition of the
brake every time the brake is applied.
The circuit uses an op-amp IC
CA3140 (IC2) as voltage comparator
and timer NE555 (IC3) in monostable
configuration for alarm. Voltage comparator
IC2 senses the voltage level
across the brake switch. Its non-inverting
input (pin 3) gets half the supply
voltage through potential divider resistors
R3 and R4 of 10 kilo-ohms each.
The inverting input (pin 2) of IC2 is
connected to the brake switch through
diode D1, IC 7812 (IC1) and resistor
R2. It receives a higher voltage when
the brake is applied.
Normally, when the brake is not
applied, the output of IC2 remains
high and the red LED (LED1) glows.
The output of IC2 is fed to trigger pin
2 of the monostable through coupling
capacitor C2. Resistor R1 is used for
the input stability of IC2. IC1 and C1
provide a ripple-free regulated supply
to the inverting input of IC2.
IC3 is wired as a monostable to
give pulse output of one second. Timing
elements R7 and C4 make the output
high for one second to activate the
buzzer and LED2. Usually, the trigger
pin of IC3 is high due to R6 and the
buzzer and LED2 remain ‘off.’
When the brake pedal is pressed,
pin 2 of IC2 gets a higher voltage from
the brake switch and its output goes
low to switch off
the red LED. The
low output of IC2
gives a short negative
pulse to the
m o n o s t a b l e
through C2 to trigger
it. This activates
the buzzer
and LED2 to indicate
that the brake
system is working.
When there is pressure
drop in the
brake system due
to leakage, LED1
remains ‘on’ and the buzzer does not
sound when the brake is applied.
The circuit can be assembled on
any general-purpose PCB or perforated
board. Connect point A to that
terminal of the brake switch which
goes to the brake lamps. The circuit
can be powered from the vehicle’s
The circuit requires well-regulated
power supply to avoid unwanted triggering
while the battery is charging
from the dynamo. IC4, C6 and C7 provide
regulated 12V to the circuit. The
power supply should be taken from
the ignition switch and the circuit
ground should be clamped to the
vehicle’s body. A bicolour LED can
be used in place of LED1 and LED2
if desired.

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