Piezo-electric device cut at a specific resonance frequency, mostly used in oscillators.

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2
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3answers
36 views

Why are 32.786Khz crystal cans soldered to PCB?

Every development board I have ever used that includes a 32.786Khz crystal has always had its can soldered directly to board. What is the reason for this ? Is this to minimize radiated energy from ...
0
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3answers
48 views

How does oscillator frequency stability affect timing?

If, for example, a crystal oscillator is specified as +/- 100ppm what does that mean? That the exact frequency is uncertain to that degree, or that the frequency varies by that degree over normal ...
3
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1answer
42 views

One crystal oscillator for multiple clock inputs PCB tracks topology

When sharing a crystal oscillator output to multiple clock inputs, what should the oscillator output PCB tracks topology be ? Should they go from the oscillator output to one clock input to the next ...
0
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0answers
35 views

Colpitts vs. Hartley?

What are the pros and cons of using a Colpitts or a Hartley configuration for an oscillator?I know that the difference between them is the form of feedback, but does one or the other perform better ...
3
votes
1answer
78 views

Crystal oscillator problem

Here is the datasheet of the crystal (32 MHz) that I use for a MCU. The right layout is an older version of my board which totally works fine. The left one is the newer version where I placed the ...
0
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0answers
14 views

T/R switch for single element material thickness testing (-200V pulses)

Our non destructing ultrasonic inspection design now has two crystals, one for transmitting and one for receiving. We would like to have only one crystal for transmitting and receiving. This is common ...
1
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2answers
43 views

XMega Get Clock Speed

I'm doing some debugging on my project and I need to check if I'm setting my external crystal correctly. I have the ability to print out to a serial monitor via usb, is it possible to retrieve the ...
0
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2answers
53 views

Understanding a simple crystal oscillator transmitter circuit

I've recently built this circuit: http://makerf.com/posts/mighty_simple_shortwave_transmitter It works on the desired frequency as you can see from this video : ...
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2answers
107 views

What makes a crystal oscillation to begin

I'm trying to understand how the Pierce oscillator works. I started from the very beginning and I'm looking into the crystal resonator. Thanks to this answer How does a Crystal work? I've managed to ...
0
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0answers
27 views

asymmetric oscillator layout

Due to space and redesign time concerns, the crystal I'm using cannot rotate. I'm updating the circuit to hopefully make the clock as robust as possible. I have copper keepout in the dotted area ...
2
votes
4answers
86 views

How do crystal oscillators work with feedback consisting of CMOS inverters?

For a crystal oscillator to work, there must exist a feedback path with properly designed specifications in order for all to work as expected. Broadly, the basic form of this control system is as ...
0
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1answer
29 views

How to select external crystal in atmega162

How to set AVR to select external crystal for clock? A _delay_ms(1000) is producing a quick beep however it should produce 1 sec beep if it is operating on 12Mhz. Could it be done programatically of ...
10
votes
3answers
562 views

Are there crystals that are tolerant of high pressure?

Are there crystals that are tolerant of high pressure? Or do they all have an open space in their case? A customer wants to use our product in a submarine, immersed in high pressure oil. I ...
1
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1answer
72 views

Load capacitance for a microcontroller crystal?

I know there are lots of similar questions on here, but I've read many of them and am still a little confused. I'm a student making a board similar to the Arduino Pro Micro, using a Atmega32U4 ...
0
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2answers
70 views

Can one always drive oscillator inputs with a single-pin oscillator output and bypass the integrated feedback circuitry?

Very little is written in the MCP2211 datasheet regarding the oscillator input configurations. The microcontrollers I have been using lately allow you to use the self-powered, single output ...
4
votes
1answer
378 views

Why don't I need to consider trace width for a high speed oscillator crystals?

I have followed some reference designs that uses crystals like 40 MHz for the MCU, and I have not considered the trace width to do impedance matching. The result is that the boards works fine (I kept ...
0
votes
1answer
71 views

Can I run an ATmega on 3.3V with an external 16 MHz crystal? [duplicate]

I have been told that is overclocking or it just will not work, but I want to be sure. And are there any real differences that would effect from this? Any tips and tricks will help, thanks!
0
votes
3answers
115 views

Can you use your computer to make a radio transmitter? [closed]

I was wondering, is it possible to oscillate the electronic signal emitted from the audio jack on a computer ? Because I would like to somehow create a simple radio transmitter just using my computer. ...
1
vote
3answers
98 views

Unexpected resistor for oscillator

Please see these two part of this board : In your opinion, What's the usage of the R32 resistor? also in the AN2867 aplication note has been mentioned: Then we have to put a resistor to limit ...
3
votes
1answer
356 views

Crystal Oscillator not giving correct frequency

I have a 48MHz Crystal Oscillator (see here) that I am using as a clock for my microcontroller (EFM32GG332F1024). Looking at the datasheet for this crystal it seemed to me that the load capacitance is ...
1
vote
1answer
128 views

Value for feedback resistor in pierce crystal oscillator configuration

This question is partially an "understanding english" question and partially and "understanding the pierce oscillator configuration" question. Backstory I'm currently looking at using a Freescale ...
0
votes
1answer
82 views

Atmega32u4 not detected

I have made a Arduino Leonardo clone and have been trying to burn a bootloader into it. I am still unable to connect to the Atmega32u4. It says "Unable to enter programming mode. "Unable to enter ...
0
votes
1answer
211 views

Choosing between internal oscillator and external crystal- ATXMega32E5

We are working with a modern microcontroller ATXMega32E5, from the ATMEL XMega family. Our aim is to use the UART of the controller for effective communication, with the speed of about 9600 or 4800 ...
0
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0answers
54 views

Can I replace crystal input with mems oscillator

I am designing a device that uses a real time clock (RTC) from ABRACON. AB1805-T3. RTC Datasheet: http://www.mouser.com/ds/2/3/AB18XX-30381.pdf The device has the option to either select an internal ...
2
votes
2answers
148 views

Selecting an external crystal for FPGA

Assuming that the FPGA has a clock multiplier to get much faster frequencies internally, what is good choice for an external crystal? Let's say I've got a Virtex 7 class FPGA, and I plan to run ...
2
votes
1answer
113 views

AVR external crystal not working with UART

So I have an ATmega328P with a 14.7456MHz external crystal, full-swing settings, and I'm trying to talk to my mac via UART and an FTDI friend-type device. If I connect AVR Tx to AVR Rx, then all ...
2
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3answers
62 views

Interpreting Crystal Deviations

I am investigating the accuracy of a crystal mounted on a MCU. The API provided by the MCU manufacturer has a TimeGet48 function that returns a 48-bit number ...
2
votes
1answer
108 views

Understanding the Pierce Oscillator Pi Network

I've been looking at the Pierce oscillator and I think I understand how it operates, but I'm a little unsure of the role played by the series caps to ground (the so-called pi network). I've put ...
0
votes
1answer
60 views

How to connect muRata XRCGB_F_M Series (XRCGB27M120F3M00R0) to microprocessor oscillator

This device as described in the data sheet (Crystal Unit (Crystal Resonator)) shows four pad pins (labeled 1-4) in an arrangement similar to ceramic resonator units. However, as shown in the diagram ...
1
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1answer
204 views

ATmega XTAL input capacitance and crystal load capacitance

I need precise low-ppm crystal for my circuit with 8-bit ATMEGA (AT90USB1286). Currently 18pF TXC HC-49 (11.5x5mm) is used. I need also minimize size to reduce potential EMC and PCB. TXC - 7M/B ...
1
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1answer
121 views

Crystal radio (AM receiver)?

I've made this circuit on a breadboard. It doesn't work properly. I hear the sound of an oscillator (similar to the sound of 555 timer). I changed C6 and L1 to change the frequency but I hear the ...
2
votes
1answer
133 views

A question about resonance and crystal radio?

This is a circuit of crystal radio transmitter. I've tested it, and it works properly. but I can't understand everything in this circuit... L1 and C5 make resonance frequency, Would you tell me if ...
1
vote
2answers
180 views

What are quartz crystal oscillators?

I'm a beginner in electronics and I found two quartz crystal oscillators, each one has two pins. Their numbers are: sjc4.000a ee4.000 Is it possible to know the ...
0
votes
4answers
121 views

How to detect Resonance?

I've made many RC circuits and RLC circuits ( series and parallel resonance). I want to make sure that these circuits work and make resonance, but I don't have CRO device. Is there any way to detect ...
5
votes
3answers
227 views

Does CKDIV8 save battery life when programmed?

On ATmega328P there is a CKDIV8 fuse bit that when programmed divides clock by 8. I'm wondering if the power consumption is equal on these two setups: micro with 8MHz external crystal and CKDIV8 ...
1
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0answers
266 views

Atmega32 can't verify after setting correct fuses for external crystal. HELP

I am having trouble with some Atmega32A's purchased off from eBay. The MCU's does not seem to be fake as they are functioning properly. I am experiencig the following problem: I want to use external ...
2
votes
3answers
97 views

Crystal or Crystal Oscillator for time sensitive device

A device that I'm working on is controlled by ATmega328P microcontroller. This will be some sort of a watch, therefore I want it to be as precise as possible. For instance if left to run for a whole ...
1
vote
1answer
137 views

Crystal clock oscillator giving out sine wave, help?

I am building a 50MHz clock by using ABRACON ACOL-50-EK crystal clock oscillator. I have connected 3.3V supply (with a 0.1uF capacitor to ground) to Vdd (pin 14). GND (pin 7) is grounded and output is ...
0
votes
0answers
49 views

Crystal Oscillator output voltages and power

I have built the crystal oscillator stage to the Pixie 2, a Hartley oscillator, with a 9 volt voltage source. I measured the output with my VOM set to AC 30 volts. It read almost 30 volts. That is ...
7
votes
7answers
1k views

3 Hz from a watch crystal

I have a stepper motor which step angle is 2 degrees. I want to display seconds using a needle attached to this stepper. The watch crystal divides nicely to produce 1Hz pulses, so every second I can ...
4
votes
1answer
478 views

ATtiny External Clock not working

So, I've been wanting to break away from the arduino abstraction for a while now. I made a board that has an ATtiny10 on it with a crystal and an output. I cannot for the life of me understand what ...
1
vote
0answers
253 views

Piezo & RFC Modeling! [closed]

I want to model the circuit in the picture below. It is an ultrasonic humidifier. But I can't model it for two reasons: The inductor on emitter is a RFC (radio frequency choke). There's a crystal ...
4
votes
1answer
250 views

how to select capacitor for a crystal oscillator

Here is a 32 MHz crystal from one of TI's reference design The BOM list defines the crystal as ...
1
vote
2answers
411 views

Is the value of XTAL load capacitors for ATmega328p @ 16MHz critical?

I'm going to try to assemble an MCU-based circuit using an ATmega328P-PU (Arduino UNO stripped down to essential parts as in this tutorial). I've skimmed over a lot of posts on EE.SE about load ...
16
votes
3answers
4k views

How does a Crystal work?

Specifically, a 2pin and 4pin quartz crystal oscillator. What I know: current is applied and the crystal oscillates in order to provide an oscillating signal. What I want to know: How does the ...
-1
votes
1answer
137 views

Improper functioning of Timer1 in pic18

I'm using pic18f controller and i am supposed to get a delay of 1 sec.I'm using an external crystal of 16mhz and this is the configuration bits that i have used in it.I have configured the timer1 and ...
1
vote
2answers
267 views

Can I share a crystal between two AT89S52? Is this method correct?

I have a project which I will need two 8051 microcontroller on a board. I want to reduce its size and cost, so I tried to use one crystal for two microcontroller, but just connect them parallel ...
2
votes
4answers
171 views

Electrostatic charge changes crystal frequency

What are the reasons of this undesired effect: I have a PIC with RTC (Real time clock) connected to an external 32.768kHz crystal for auto-calibration (according to PIC Manual handbook). The crystal ...
0
votes
1answer
70 views

Can you identify immersionRC transmitter crystal?

Please identify this crystal. It's from immersionRC 600mW video transmitter. Labeled S80003H. I have another one labeled S80009F from same brand transmitter 100mW, they are same, whats difference?
1
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1answer
316 views

If I'm using an RTC and ATMega328p (arduino UNO chip), do I need two crystals?

If I'm using an RTC that requires an external crystal, do I need a second external crystal for my ATMega328p? Or can the two share? What is standard practice for this kind of thing? I'm making a ...