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

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47 views

Does the LPC1343 MCU need an external clock for USB operation?

I am trying to design a board using the LPC1343: http://www.nxp.com/documents/data_sheet/LPC1311_13_42_43.pdf I would like to be able to use its on-board USB bootloader to program it. My question is ...
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66 views

How to use a crystal oscillator

I am trying to use a crystal oscillator as a clock signal for the PWMCLK input of a LED driver chip (TC62D723FNG) I have a FOX 1813-0245 8926 25.00000 MHz crystal oscillator I picked up at a local ...
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1answer
92 views

PCB layout for 8-16MHz crystal very near WiFi module AND small DC motor

I'm designing an "Internet of Things" appliance where space and layout are constrained by mechanical and cost requirements. The main processor is a PIC18 and its crystal (probably 8MHz, maybe 16) is ...
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3answers
57 views

Load Resistor across Crystal

What is the purpose of using a 1M Ohm resistor across crystal pins? Please refer to the image for clarity. The crystal serves as the clock source for an USB Hub device(LAN9512). There is nothing ...
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1answer
56 views

Will a 5V crystal oscillator oscillate with a 3.3V supply?

My question is in the title. I was looking for a component, but I can only find it with 5V. There is no data sheet provided so my question is in general: Will a 5V crystal oscillator oscillate with a ...
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40 views

Crystal oscillator output impedance

I want to build a varactor frequency tripler (from 80 to 240 MHz). Can't find XO output impedance for an input matching network. I would appreciate any advice on this matter.
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2answers
156 views

How to test a crystal resonator in board?

I have 2 quartz crystal resonators in my pcb board: 32.768 kHz & 20 MHz. They are connected to a Freescale MC12311 transceiver IC, which has an HCS08 micro-controller embedded in it. I want to ...
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3answers
429 views

How does this wireless transceiver work?

While messing with Arduino I came across this wireless transceiver. As a newbie in all this stuff, it's written that it operates at 2.4 GHz, so the transmitter crystal and receiver crystal must ...
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45 views

Can any one tell me the purpose of those two capacitors at the both end of XTAL1 and XTAL2 connected to crystal oscillator? [duplicate]

How does those two c2 and c1 capacitor affect clock input spectrum? What would happen if those two capacitors were not there? Are they mandatory to have?
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44 views

Difference between 3.3V half-size DIP oscillator and Full size DIP oscillator

I have often heard oscillators with 3.3V half-size DIP oscillator with 4 pins and Full-size DIP oscillator with 8 pins. Why would someone want to use half-size DIP or full size DIP?
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1answer
52 views

Any good suggestions for Basys2 optional oscillator 50 MHz or 100 MHz? [closed]

I want to get the optional stable oscillator for the Basys-2 but don't know which would be the best choice for 50 MHz and 100 MHz? Has anyone bought and used any? If so, what is the part number?
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46 views

Frequency modulation occurs not in an expected way

I've built this oscillator. Then I gave it a DC bias and connected an mp3 player. Result: I have local fm-stations muted at 90MHz, 90.75MHz and 89.25MHz. However, at 90MHz an mp3 music is very ...
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2answers
59 views

How does spread spectrum VCXO (voltage controlled oscillator improve EMI on your board?

I have seen people adding spread spectrum voltage controlled oscillator to EMI on the board, How is EMI affected by single spectrum crystal and with spread spectrum crystal.
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1answer
64 views

Crystals as RLC circuit? How?

What gives the crystal oscillator a property of Inductor? How does energy transformation between electrical field and mechanical stress and strain makes oscillator work like a Inductor? I know how ...
0
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1answer
68 views

ATtiny2313 accidental wrong fuse settings with crystal

I wanted to add external 12.000 MHz crystal to ATtiny2313. I connected it (both crystal pins to ground using 0.1μF capacitor) and flashed fuse bits. ...
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1answer
66 views

PIC:how can we operate PIC24FJ256GB106 controller to 32MHz internal frequency?

I am using below configuration bits for 32MHz internal frequency. _CONFIG2(IESO_OFF & FCKSM_CSECME & OSCIOFNC_ON & POSCMOD_NONE & FNOSC_FRCPLL) I know that FNOSC_FRCPLL give me ...
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1answer
102 views

Designing an Oscillator

I'm tired of having to resort to Google to find every single oscillator design. I would usually just try to search for a circuit using the same frequency crystal, and try to build that. Right now, I ...
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1answer
125 views

Determine polarity of crystal oscillator [closed]

A two-pinned 13.824 MHz crystal oscillator broke away from the pads on a PCB board. One pad is labeled + and the other is GND. Do two-pin crystal oscillators have specific polarity?
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63 views

What's the function the network outside a crystal oscillator connected to an IC?

Take a look at this: Then general network is commonly seen when connecting an oscillator to an IC. What is the purpose of this network? Is there an article I can read on it?
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1answer
122 views

Crystal oscillator in schematics

What the numbers 1 and 2 mean next to Crystal oscillator in hardware schematics? I tried to search online and went through about 20 lists with component symbols, but non had the numbers nor ...
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3answers
345 views

crystal oscillators connected in parallel

why there are two crystal oscillators connected in parallel in the circuit above? i am familiar with the configuration of Q2( look at the schematic) but what is the purpose of Q3? do i really need ...
4
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1answer
201 views

Crystal, PCB Layout

I've completed a few circuit board layouts before, however this is my first time doing a layout with a oscillator/MCU. After doing some reading (via this site and datasheets) I've come up with the ...
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1answer
61 views

Understanding crystal resonator symbols - which one is 24Mhz?

So, I'm in need of a 24MHz crystal to drive an AVR microcontroller. I've got some crystals that I've desoldered off some old, useless equipment. I've found three crystals that have '24' on their ...
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1answer
165 views

Radio Transmitter using Crystal Oscilliator

I am on the mission to control my RC car using arduino. The simplest way I thought of doing this is to add arduino outputs into the transmitter. Long story short I wanted to learn more about how these ...
2
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1answer
108 views

Using UART clock 3.6864 Mhz for a microcontroller

I want to use a 3.6864 MHz external oscillator to clock my ATMEGA328p to ensure 'error free' serial communication. When I looked at this page, I see that 3.68464MHz is also represented as 2*1.8432 ...
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238 views

Run an atmega328 only using an 16Mhz crystal without caps

Can you run an ATmega328 only using an 16Mhz crystal, so without the capacitors?
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2answers
184 views

Can a wrong crystal oscilator capacitor burn the MCU?

Short story: I am using an Atmel AT32UC3C2512C MCU and I selected a 20MHz crystal oscillator for it and two NP0 10pF capacitors. I was in doubt between 10pF, 15pF or 22pF, so I decided to start with ...
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1answer
401 views

What effect does selecting the wrong load capacitance for a crystal have?

I've seen questions such as this one and this one that talk about selecting capacitors that, in series, match up as closely as possible to the load capacitance of the crystal. What effect does ...
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1answer
81 views

4-pin quartz resonators - shall the 2 ground pins be connected to ground plane of the pcb?

I am about to use a 8MHz quartz resonator that has 4 pins (http://datasheet.octopart.com/LF-XTAL026380.-IQD-Frequency-Products-datasheet-6993.pdf): pin 1 and 3 are connected to resonator while pins 2 ...
2
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1answer
132 views

Why do the satellite manufacturing companies themselves make their crystals?

Yesterday, I saw this documentary>How To Build A Satellite(look this intervals->27:29 - 30:16) and after see it, I had a question but I couldn't find any answer for it. my question is this: Why do ...
4
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1answer
102 views

Chosing XTAL Capacitors for Microcontroller

I am trying to chose the parallel capacitors for the crystal on my micro-controller. The crystal is a 9.6MHz quartz crystal (chosen because 9.6MHz is good for UART communication). Going through the ...
2
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2answers
305 views

How is Crystal Oscillator implemented in digital circuit to generate clock frequency. What part of crystal oscillator makes the clock signal?

How is Crystal Oscillator implemented in digital circuit to generate clock frequency? What part of crystal oscillator makes the clock signal? I know the fact that crystals has its resonating ...
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4answers
821 views

How can I measure the frequency of a watch crystal using my oscilloscope?

I am trying to measure the frequency of a 32.768 kHz watch crystal which is connected to my AVR MCU. This is so that I can fine-tune the crystal's capacitor values to get a correct frequency. However, ...
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127 views

NE602 local oscillator

I'm making experiments with simple SA602 (formerly NE602) chip to educate myself build radio circuits. I started with local oscillator circuit. I used a 10 Mhz crystal. It oscillates at that ...
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1answer
164 views

What is crystal, resonator, crystal resonator, crystal oscillator?

After browsing different online electronic stores, I got a little bit confused with crystals... What's the proper name for this: Crystal? Quartz crystal? Resonator? Quartz crystal resonator? ...
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2answers
147 views

Speeding up an analog clock

a friend of mine came to me with a question and I thought I'd ask you guys for some insight. They were wondering if it would be possible to speed up a regular wall clock so that it would cycle twice ...
1
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1answer
111 views

Is a crystal needed for burning firmware on AVR?

I want to program an AVR attiny2313 with my AVR ISP MKII So I built a header that connects to a breadboard where I want to burn the firmware to the ATTiny via ISP, so my question is, I have a ...
5
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2answers
177 views

Standard packages for compact SMT crystals

There is an old and bog standard form factor for SMT crystals - HC49/US. The problem is that HC49/US takes a lot of real estate on the board. It's 12mm long. Another problem with crystals and ...
5
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1answer
202 views

Why crystal capacitors have to be close to each other?

Atmel's AVR186 document shows in page 2 a layout of two capacitors very close to each other and pointing in the same direction, also in page 3 they say: "The load capacitors should be placed close to ...
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3answers
166 views

32kHz crystal does not oscillate

I'm trying to run an ATtiny2313 on this 32KHz crystal. The load capacitors I've used are 22pF. The crystal does not oscillate unless I touch capacitors with a finger or just touch one of the ...
2
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1answer
133 views

AVR strange toggle LED behaviour

I'm following a basic tutorial for AVR. All seems fine but the speed? The problem is that if I leave the speed of the xtal commented the code works, but if I place it in 8 MHz or 16 MHhz [I'm using ...
5
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2answers
167 views

MCU crystal capacitor selection

I will be using the AT32UC3C2512C, the AVR32768 Application note recommends 22pF capacitors for crystals up to 16MHz...I will be using a 20MHz crystal, should I choose a 22pF or a 15pF loading ...
5
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1answer
398 views

Why use capacitors with crystals?

Whenever I come across crystals used in any of MCU or Processor, whether it be 32.768 kHz responsible for Real Time Clock or 25 MHz crystal required for clocking different interfaces connected with ...
2
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1answer
207 views

External crystal not working

I have designed a PCB for a PIC32MX795 chip. (Datasheet) I want to use an external crystal (Link to datasheet in PDF) but when I solder the crystal to the board, I can't get my PLL to lock to 80MHz. ...
2
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1answer
133 views

16MHz Crystal with 2p load capacity: What load capacitors are necessary

I found a nice and cheap crystal on AliExpress which I want to use with my ATMEGA328 microcontroller. Its load capacity is only 2pF. Normally I would say, that the 2 capacitors from the crystal to ...
3
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2answers
281 views

How to Set up an Oscillator For Simple Frequency Generation [duplicate]

I ordered a bunch of these 8mhz crystals: http://www.amazon.com/gp/product/B005PSXEQ4/ (they sent me 13mhz instead though, no big deal...) I just got them to experiment with. I assumed they only ...
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181 views

Impedance matching for monolithic crystal filter

I want to use an MCF model 10M30C. It's not said a lot about impedance matching in its datasheet and also it's not clear to me so I just copy data from the datasheet: Termination Impedance ...
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754 views

How to connect 4MHZ crystal oscillator to get 16MHZ

I've 10 4 MHZ crystal oscillators. I need a 16MHZ clock signal. Can I connect multiple 4MHZ oscillators somehow (serial, parallel) to get 16MHZ?
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2answers
264 views

Will an IC that requires an Oscillator work without one?

I have a PL2303HX and I just etched my board with a USB to Serial IC (PL2303HX). The problem is that it requires a 12 MHZ crystal but I don't currently have. Just a side note, the IC is on the same ...
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4answers
248 views

Troubleshoot Crystal Radio

Alright, I'm totally confused. I have built the following circuit with absolutely no result, not even a click. Even after reading through several other similar questions on the board, I haven't ...