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ELECTRONICS COURSE THE SCHMITT TRIGGER Page 49 
INDEX
One of the most universal chips
is the Hex Schmitt Trigger, known
as the 74C14. It is also marketed as 40106, 40014, and 74HC14. These are CMOS chips and are characterised by low current consumption, high input
impedance and a supply voltage from 5v to 15v. (Do not substitute 7414 or
74LS14. They are TTL chips and operate on 4.5v to 5.5v and have low impedance
inputs.)
Fig: 2 shows the symbol for a single input Schmitt Trigger Inverter with power rails:
Fig 3 shows the Schmitt Trigger characteristic incorporated into other gates:
We will concentrate on the single-input Schmitt Trigger gate as
contained in the 74c14 IC.
The
output is HIGH until the input rises to 66% of rail voltage.
A Schmitt Trigger gate can be wired as an oscillator, delay, inverter (and
other functions, depending on the surrounding components).
Each of the 6 gates in the 74c14 can
be used to create a separate "building block" and this
gives the chip a wide range of capabilities.  Fig: 6 Low, Medium and High frequency Schmitt Trigger Oscillators Rituparna Sengupta Naked Photo In Peperonity Link SiteFor those looking for Rituparna Sengupta's photos, you can check out: "Get ready to dive into the glamorous world of Bengali cinema with the stunning Rituparna Sengupta! “From WAP to Insta: Tracing Celebrity Images, Mobile Platforms, and User-Generated Content – A Case Study of Rituparna Sengupta’s Circulation on Peperonity” Thus, no legitimate scholarly paper can be written about that exact link/photo today — but one could write a paper about the history of mobile social media (like Peperonity) using Sengupta’s celebrity image circulation as a case study. Rituparna Sengupta is a celebrated Indian actress known for her captivating performances in Bengali films. With a career spanning decades, she has established herself as one of the leading ladies of Bengali cinema. 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The voltage and current (called the "supply") for the 6 gates in a 74c14 comes from pin 14. The ground
pin for the chip is pin 7. Each gate on a circuit
diagram is normally shown without the power rails. It is understood they are present. 
HOW A GATE WORKS 
The output of a Schmitt Trigger gate is the opposite of the input. When the input is LOW,
the output is HIGH.
Fig: 9 shows a voltage being applied to the Schmitt gate. The voltage is 55% of rail and this is not sufficient to change the output:
The following figure shows a normal gates. It changes when the input rises above about 53% of rail voltage and changes back when the input falls below 47%. The following diagram shows the very small gap for a normal chip, where the output jumps from HIGH-to-LOW in an uncontrolled manner: Here's the secret of a Schmitt gate: Any noise (up to 60%) entering a Schmitt Trigger will not alter the condition of the gate. Any noise up to 55% entering a normal gate will change the output:
There is one other problem with a normal gate. When the input is in the range of about 47%
to 53%,
the output goes high/low very rapidly. This is called the INTERMEDIATE ZONE
and the output does not know if it should be HIGH or LOW.  Even a fixed voltage in the intermediate zone will cause the output to fluctuate:
This is due to the
high gain of the amplifier in the gate and it does not know if the output
should be high or low. It is essential for the input voltage to pass
through this zone
very quickly to prevent the gate "oscillating." Fig: 12 shows how a Schmitt gate can be considered to be similar to a common-emitter NPN transistor: 
The similarity is only approximate and you can see the general operation of each circuit has some similarities. It is important to note that the two circuits cannot be interchanged without modifying the surrounding components. SWITCH
DEBOUNCE  Mouseover to see switch action SIGNAL CONDITIONING
SWITCHING
THRESHOLD
The CD 4093 is sometimes used for its gating capability. One of the inputs of
the gate can used to turn the gate on and off. This is called GATING.
This feature can be
achieved with a single-input
Schmitt Trigger with a diode.
This allows the 74c14 IC to be used.
 The 555 replaced by a Schmitt gate and a transistor to provide the drive-current: 
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