Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [quartz]

17 questions
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Capacitor for quartz crystal in harmonics

I saw a FM transmitter radio circuit, which was an easy one and had a 20 MHz quartz crystal, on internet. It promised to fix the frequency at 100 MHz. I soldered the components together and tried at home. It worked as expected. As the transmission…
lastime
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Crystal frequencies

the context is that I am working on project which uses a 32 768 Hz quartz oscillator used for a uC. My questions are: I have read that series resistance should be low (25 to 100 Ohm) otherwise it can lead to oscillator startup failure. But there is…
NinjaGreg
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starting material for silicon production

Where does silicon semiconductor manufacturing start from? I mean, what are the principal ores that may be used to start the technological process and what extraction process is used? (And what are the principal countries that extract such ores?) I…
trying
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The piezoelectric effect in natural quartz crystals

Background I have recently started doing a lot of research on the piezoelectric effect with the hopes of gaining a better understanding of the topic. When I can I like to do experiments on top of reading because it helps cement the knowledge I…
CyClone
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How does a crystal oscillator work?

What I already know is that they are used as a frequency generator when they are stimulated at their own resonance frequency. But when I have to tune the applied voltage to that certain frequency, why can't I use this voltage directly. What's the…
Ben
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Quartz Crystal with or without metal lid for EMI suppression?

Is there any reason for choosing a quartz crystal with or without metal lid? Some datasheets (this one for instance: link) claim better EMI performance and other do not write at all about it. So is there a reason I should choose quartz crystals with…
stowoda
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How to make a quartz clock that does not stop

We are an association of French students learning electronics. I'm actually making a circuit to make a quartz clock, I'm looking over the schematic that I found on the net, but I really don't know why these Components were chosen and why these…
Anthox
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Can I safely add an analogue clock in series with an LED light?

I have a voltage regulator outputting 5v to an LED grow light that draws 1A. Can I increase the output to 6.5v, and add an analogue quarts clock in series, intended to run off a 1.5v battery? My concern is that the current draw from the clock is not…
themartin
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STM32L073 VBT6 crystal does not start

I use a STM32L073 VBT6 LQFP100 with a CC7V-T1A 32.768 kHz crystal as input for a timer. The crystal is connected to two 9pf capacitors for ground, as specified in the manual. (See image.) On the board, I use USART for communication with a PC or…
Static
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PC: Which crystal is used for main clock? (X570)

I want to improve intrinsic (hardware) precision of windows/linux (OS) time (specifically, in my case it's AMD X570 platform), without relying on periodic correction via NTP servers. Common approach is to replace simple crystal to TCXO or OCXO. Many…
BarsMonster
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Help with a Colpitts quartz crystal occillator at 1 MHz

I am currently attempting to simulate as well as design a Colpitts oscillator using a quartz crystal operating at 1 MHz. I seem to be struggling with my output which is more of a sawtooth wave than a sinusoid (which is ideally what I am aiming…
Chris
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Load frequency calculation of quartz with its load capacitance

After web researches and a first discussion about general comprehension, I am a bit lost with the load frequency calculation: I see a design which uses two 33pF external capacitors (C1 and C2),with a uC which has two 4pf input capacitors (Cin and…
NinjaGreg
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Output Impedance of a DIP8 Crystal Oscillator

I would like to make a module for OOK transmission using a generic DIP8 Crystal Oscillator, and this is what I currently have. How is the output impedance of a Crystal Oscillator determined?
George
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Negative frequency deviation in crystal oscillator

What is the significance of a negative frequency deviation in the freq deviation vs temperature profile of a typical OXCO (e.g. the diagram seen on this page)? My understanding is that a positive deviation on these sorts of diagrams is ± some window…
Bobcloclimar
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How to flash ATtiny85 with clock quartz (32khz) again?

I flashed ATtiny85 once with simple program blinking for 1 second. F_CPU = 32768. I set low fuse byte to 0xe6 with avrdude. According to datasheet 6 = 0b0110 CKSEL is intended for low frequency quartz oscillator. In my case it is 32khz. Capacitors…
Daniil Iaitskov
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