Electronic Basics #17: Oscillators RC, LC, Crystal
video description
Practically even a circuit with carefully matched components, maintained at the same room temperature might temporarily remain in saturation. BUT, WILL eventually start to oscillate when the symmetry is broken by microvolt thermal noise that is amplified, the feedback increases the unbalance, until the circuit IS OSCILLATING.
Date: 2020-09-05
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Comments and reviews: 9
NRG
I want to observe only the XTAL in a circuit, with a scope. Should I have a current limiting resistor in series? My idea is to slowly increase the voltage starting from 1 volt, to see what happens with voltage across the XTAL or the resistor. Does anyone have any suggestions for this? I want to gradually scale up with more components but all these as shown in the video (and other videos) doesn't help me focus only on the crystal component to understand it by itself.
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I want to observe only the XTAL in a circuit, with a scope. Should I have a current limiting resistor in series? My idea is to slowly increase the voltage starting from 1 volt, to see what happens with voltage across the XTAL or the resistor. Does anyone have any suggestions for this? I want to gradually scale up with more components but all these as shown in the video (and other videos) doesn't help me focus only on the crystal component to understand it by itself.
reply
Connor
1: 25 I don't really understand how the capacitors get charged alternatingly. Unless I'm overlooking something, the circuit is perfectly symmetric, right? So by my logic, C1 and C2 should get charged at the same time and should then activate the transistors at the same time. Also, how does C1 discharge exactly when transistor Q2 is conducting but not Q1? Through the base of Q2? If there's still someone who reads these comments, please explain! Thanks!
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1: 25 I don't really understand how the capacitors get charged alternatingly. Unless I'm overlooking something, the circuit is perfectly symmetric, right? So by my logic, C1 and C2 should get charged at the same time and should then activate the transistors at the same time. Also, how does C1 discharge exactly when transistor Q2 is conducting but not Q1? Through the base of Q2? If there's still someone who reads these comments, please explain! Thanks!
reply
necro
So the crystals are used to time the processor.
Good now I need to now why a precessor needs time, what are the signals going in and out the precessor, how are this signals being created and why you need them.
In other words, thanks for explaining the 555 chip but this video is mostly useless as a reference, whatever you explained I could easily get out of Wikipedia
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So the crystals are used to time the processor.
Good now I need to now why a precessor needs time, what are the signals going in and out the precessor, how are this signals being created and why you need them.
In other words, thanks for explaining the 555 chip but this video is mostly useless as a reference, whatever you explained I could easily get out of Wikipedia
reply
MartinMartin
frm. 01Hz to 100 khz a Wein Bridge oscillator does not require inductors; it is made with 2 matched resistors and 2 matched capacitors and can use a incandescent bulb to maintain its amplitude with very low distortion. It can even be made using a
variable dual capacitor allowing the frequency to be varied by a factor of 10!
reply
frm. 01Hz to 100 khz a Wein Bridge oscillator does not require inductors; it is made with 2 matched resistors and 2 matched capacitors and can use a incandescent bulb to maintain its amplitude with very low distortion. It can even be made using a
variable dual capacitor allowing the frequency to be varied by a factor of 10!
reply
Med
Dear Scott.
I'm a beginner in electronics, I found in your videos a bunch of informations but the only problem is that you start with professional things and you don't start with rules and theories
Directly you start with the schematics. I hope you slow down the courses and thank you so much
reply
Dear Scott.
I'm a beginner in electronics, I found in your videos a bunch of informations but the only problem is that you start with professional things and you don't start with rules and theories
Directly you start with the schematics. I hope you slow down the courses and thank you so much
reply
Juan
Hi! One query: I have to perform an oscillator to maintain a QCM at its resonant frequency which is 10 [MHz]. I could use the last circuit you showed but I don't understand how to choose the components according to what the resonant frequency is.
Very good video. Greetings from Argentina.
reply
Hi! One query: I have to perform an oscillator to maintain a QCM at its resonant frequency which is 10 [MHz]. I could use the last circuit you showed but I don't understand how to choose the components according to what the resonant frequency is.
Very good video. Greetings from Argentina.
reply
ENFOTEC
friend, how do I include an ANALOG circuit to produce or signal SPWM? because I don't want or use PIC or any other resource for implementation, can you use or know any circuit to use in the creation of the SPWM signal?
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friend, how do I include an ANALOG circuit to produce or signal SPWM? because I don't want or use PIC or any other resource for implementation, can you use or know any circuit to use in the creation of the SPWM signal?
reply
superdivemaster
I have an idea which would revolutionize certain industries, but the idea needs a person like you who understands rf generation can you hook me up superdivemasterhotmail. com
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I have an idea which would revolutionize certain industries, but the idea needs a person like you who understands rf generation can you hook me up superdivemasterhotmail. com
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Jack
Can someone please email me the circuit diagram for the circuit he uses at 2: 23. I am a newbie and would like to work from it. My email is placejack74gmail. com Thank you kindly
reply
Can someone please email me the circuit diagram for the circuit he uses at 2: 23. I am a newbie and would like to work from it. My email is placejack74gmail. com Thank you kindly
reply
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