Oscillator circuit with schmit triger

• Dec 31, 2013

• #1

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Mohamed Slama

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Hi all

i need an oscillator circuit but contains Coil with schmit trigger 74hc14d

 

• Dec 31, 2013

• #2

andre_luis

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What exactly do you mean by Coil on schmit trigger based oscillator ?


+++

 

• Dec 31, 2013

• #3

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godfreyl

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Just connect a coil between output and input, and a resistor between input and ground.

Why do you want to use a coil? You could use a capacitor instead, like this:
Connect a resistor between output and input, and a capacitor between input and ground.

In either case a 1k resistor should be ok.

 

• Dec 31, 2013

• #4

andre_luis

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As godfreyl said, it makes no sense employ an inductor for this purpose.
It is much more usual take an approach like that:


Source:http://www.talkingelectronics.com/projects/100 IC Circuits/images/Capcharging-D-complete.gif



+++

 

• Dec 31, 2013

• #5

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Mohamed Slama

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andre_teprom said:

As godfreyl said, it makes no sense employ an inductor for this purpose.
It is much more usual take an approach like that:


Source:http://www.talkingelectronics.com/projects/100 IC Circuits/images/Capcharging-D-complete.gif



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thank u but i need coil because i will change the inductance by ferrite core

 

• Dec 31, 2013

• #6

andre_luis

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What are the Central frequency and Frequency range required for oscillator you need ?




+++

 

• Dec 31, 2013

• #7

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Mohamed Slama

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i need frequency start from 197 KHZ to 300 KHZ

 

• Jan 1, 2014

• #8

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Mohamed Slama

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or from 197 KHZ to any frequency

 

• Jan 1, 2014

• #9

andre_luis

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So, you need perform as godfreyl said before on post #3.



+++

 

Last edited: Jan 1, 2014

• Jan 1, 2014

• #10

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Mohamed Slama

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i need circuit such as in post #4 but ,coil instead resistor

 

• Jan 1, 2014

• #11

FvM

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The circuit has been given in post #3. 1k and 5 mH can be used as a starting point.

 

• Jan 1, 2014

• #12

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Mohamed Slama

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thank u FvM i will try it

 

• Jan 1, 2014

• #13

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Mohamed Slama

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thank u andre_teprom
i will try it