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Crystal Oscillator Circuits
Crystal Oscillator Circuits
HCMOS Crystal Oscillators
With the advent of high speed HCMOS circuits, it is possible to build systems with clock rates of greater than 30 MHz. The familiar gate oscillator circuits used at low frequencies work well at higher frequencies and either LC or crystal resonators maybe used depending on the stability required. Above 20 MHz, it becomes expensive to fabricate...
Pierce-gate oscillator crystal load calculation
The crystal used in the topology of Figure 1 can be either a fundamental AT-CUT or BT-CUT. A BT-CUT crystal has poor frequency stability over temperature compared to an AT-CUT. This topology uses a parallel crystal and not a series crystal.
Specifying Quartz Crystals
This article explains the specifications and characteristics of crystals and crystal oscillators, and aids in specifying crystals and working with crystal vendors. The article covers the significant performance characteristics of crystals, which include resonance frequency, resonance mode, load capacitance, series resistance, holder capacitance,...
n the view of the dramatic drop in the price of crystals used in color TV sets, they now represent an economical way of building an SSB filter. The circuit shown in the diagram is for a filter with a 6 DB band width of roughly 2.2 KHz. By terminating the input and output with a 1 K Ohms resistor in parallel with an 18 pf trimming capacitor,...
Crystal Clock Generators
Here exist a small collection from three generators, what using crystal for basic production of oscillations. Each generator uses different topology of circuit for the production of oscillations.
7 MHz VFO
A 7 MHz oscillator with a variable crystal oscillator (VXO) operates very stably, but it allows only a small frequency variation (approx. 5 kHz). In contrast, a VFO with an LC resonant circuit can be tuned over a range of several hundred kHz, but its frequency stability will depend upon its construction. The use of a ceramic resonator as...
Quartz Crystal Windup Wall Clock
Last year, I found a 31 day pendulum wall clock (dissambled) in a box of parts at a swap meet and decided to try and put it together and regulate it with a quartz crystal oscillator. The escapement part that rocks back and forth and drives the pendulum was missing and had to be made from a couple razor blade pieces and heavy copper wire. The...
Oscillator Circuit Using Watch Crystal
This is a design circuit for a couple circuits that can use to produce a 32. 768 KHz square wave from a common watch crystal. This is a simple form design circuit. This is the figure of the circuit. The output can be fed to a 15 stage binary counter to obtain a 1 second square wave. The circuit on the left using the 4069 inverter is recommended ove
Crystal Oscillator Reference Circuit
This is an illustrate a reference design for a crystal oscillator using the LMK04000 family. This oscillator circuit is implemented on the LMK04000 family evaluation board. This is the figure of the circuit; The tuning diode is a Skyworks model SMV1249-074LF. It is a dual diode package in a common cathode arrangement. This diode configuration has
32.768 KHz Oscillator using Watch Crystal
Welcome to the weblog where we discuss about electronic circuits schematics, PCB design, diy kits and electronic projects diagrams. a 32. 768 KHz square wave from a common watch crystal. The output can be fed to a 15 stage binary counter to obtain a 1 second square wave. The circuit on the left using the 4069 inverter is recommended over the trans
1 Second Time Base From Crystal Oscillator
The schematic below illustrates dividing a crystal oscillator signal by the crystal frequency to obtain an accurate (0. 01%) 1 second time base. Two cascaded 12 stage counters (CD4040) form a 24 stage binary counter and the appropriate bits are gated together to produce the desired division. Using a crystal of some even multiple of 2 is desirable s
Crystal oscillator and regulator circuit
Crystal Oscillator Features Low Current Low Startup Voltage
A Pierce (crystal) oscillator intended to provide a reliable clock signal for at least 1 year when powered by battery voltages as low as 2.4 V
100KHz Crystal Oscillator
There is a great deal of old amateur gear which many amateurs have decided to restore and bring back to life. While much of the early amateur transceivers work just fine they usually lack a digital readout and must rely on analog dials for tuning. The problem of dial calibration is complicated by the non-linear effects of tuning capacitors. This...
High-stability oscillators (non-crystal)
Will LC-based oscillator be able to show performance comparable to crystals in such conditions (probably in wierd variants like LC-opamp. so that any energy loss on each stage is recovered and we are getting narrower bandwidth) Look at some of the amateur radio circuits (ARRL, RSGB, . ), especially from a few decades back, where people valued...
How do I use a quartz crystal in an oscillator
Crystals Oscillators and Resonators. What the difference
op amp Crystal Oscillator with OP AMP or Oscillator circuit built with Crystal and Op Amp
Make a Oscillator circuit with a Op Amp and an crystal (7. 68 MHz) Similar to the one in the schematic below, but for a 7. 68 MHz crystal. I have the crystal, various Capacitors, Resistors and a couple of Op Amps. But no digital Logic chips. "LM111 is not an op-amp", is it even possible I make an oscillator then from just from acrystal,...
How to connect a crystal oscillator to generate Square wave
If you want a 1MHz square wave, I would suggest using a higher frequency crystal and dividing it down, for two reasons: (1) 4MHz crystals are apt to be cheaper and easier to find than 1MHz ones; (2) Getting a 50. 0000% duty cycle from a crystal is a bit tricky; by contrast, if one converts the signal from a crystal into a pulse wave (just pass...
Incorrect frequency from crystal oscillator
Acquired an old Eistar SJ-1 Digital pulser. However the frequency it generates is always 66% of what its supposed to produce. Turns out that the frequency coming out of the frequency stage(at Pin 11)is 66% of the 16MHz crystal or about 10. 6MHz. (The 74LS38 is an open collector quad nand gate) I opened it up and traced out the layout. The...
In crystal oscillators, the usual electrical resonant circuit is replaced by a mechanically vi brating crystal. The crystal (usually quartz) has a high degree of stability in holding con stant at whatever frequency the crystal is originally cut to operate. The crystal oscillators are, therefore, used whenever great stability is needed, for examp
CF5019 High-Frequency 3rd Overtone Crystal Oscillator Module ICs
The CAMD CM8870 CM8870C provides full DTMF receiver capability by integrating both the band-split Filter and digital decoder functions into a single 18-pin DIP, SOIC, or 20-pin PLCC package. The CM8870 70C is manufac- tured using state-of-the-art CMOS process technology for low power consumption (35mW, MAX) and precise data handling. The Filter se
The MS6712 is a 4 stereo inputs/4-channel outputs digital control Audio Processor for the low voltage operation. Volume, Tone (bass and treble), balance (left/right), and fader (front/rear) processor are incorporated into a single chip. The MS6712 also has the loudness function and selectable input gain. These functions CAN be built a Hi-Fi Audio
OCXOW-AR1 OCXOW Oven Controlled Crystal Oscillator
The OPB350 series liquid Sensor is designed to work with 1/16 [1. 6mm] 1/8 [3. 2mm], 3/16 [4. 8 mm] and 1/4 [6. 3 mm] outside diameter clear tubes. When output reference circuitry is added, multiple output states such as fluid present, no fluid present and no tube present CAN be recognized. Clear liquid present causes the Phototransistor to sink...
R1210 CRYSTAL OSCILLATORS
The RF2516 is a monolithic integrated circuit intended for use as a low-cost AM/ASK transmitter. The device is pro- vided in a 16-pin QSOP-16 package and is designed to provide a phased locked frequency source for use in local Oscillator or transmitter applications. By RF Micro Devices
SM5023 Crystal Oscillator Module IC
SEL2411AA is a sub package of SEL2410, If you need see the description, please click SEL2410. If you need SEL2411AA`s datasheet, please download it from below. By Pericom Semiconductor Corporation
SEL2411AA Crystal Clock Oscillator 3.3 & 5V High Frequency ECL
SI2171 is a sub package of SI2170, If you need see the description, please click SI2170. If you need SI2171`s datasheet, please download it from below. By Silicon Laboratories
SM5021 Crystal Oscillator Module IC
The CF8223A is a FSK (Frequency shift keying) decoder and DTMF (Dual Tone multi-frequency) receiver IC. It is fabricated using a CMOS process and features a power-down function for low power dissipation opera- tion. The FSK decoder and DTMF receiver have the same performance characteristics as dedicated ICs that perform the same functions, with th
Ultra Low Voltage Micropower Crystal Oscillator Circuit
Crystal Oscillator Design
HI, i Just wanted to understand this circuit better and discuss with people So here it is a ,crystal oscillator It uses a 3.5Mhz Crystal and..
27MHz crystal oscillator transmitter simulation in PSPICE
I want to simulate 27MHz transmitter circuit in PSPICE. Circuit diagram is given as Figure-1 in following..
Crystal Oscillator Frequency Converter
The circuit was designed to create a frequency convert with the use of a crystal oscillator for the conversion of 10 MHz to 1 MHz. 7404 a hex inverter u..
Astable Oscillator Circuits
Colpitts Oscillator Circuits
Hartley Oscillator Circuits
RF Oscillator Circuits
Sine Wave Oscillator Circuits
Square Wave Oscillator Circuits
Volt Controlled Oscillator Circuits
Wein Bridge Oscillator Circuits
Pierce Oscillator Circuits
Ultrasonic distance finder circuit
The circuit described here uses ultrasonic oscillations and operates based on the propagation velocity of these oscillations in the air. Thus, we can easily determine the distance of two points if the time within which the wave travels this distance is measured. There are three main categories of distance measurement methods in use: a) By...
Simple Metal detector circuit with CD4030
Sometimes the precious metals are hidden too deep and are not detected except with complicated devices. In many cases, however, small pieces of precious metal buried near the surface can be detected by relatively simple means. Everyone is very attractive to find something potentially valuable, hidden a few centimeters below the soil. So many...
Fully automatic watering circuit for flower pots
Many times for various reasons we forget or can not water the plants that we have in our homes. And many humidity sensors units just notify us with a beeping sound or with a flashing light, that the pot needs watering. But what if we are away from home? This circuit comes as a solution to this problem. Depending on humidity of the pot at...
Simple deep searching metal detector circuit
The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the circuit of this metal detector, it is possible to detect a metal coin in depth of 90 to...
Sub-Harmonic Bass Converter for Electric Guitars
The sub-harmonic bass generator is a sound producing unit for guitars. The sound it produces looks very much like that of the bass guitar. The octave generator is sometimes quite unusual since it does not produce any of the usual ways of coloring the sound, such as filtering or distortion. Instead, a frequency division system produces outputs...
Echo Depth Sounding Sonar for Boats
In the past the sounding (sea bottom measurement) was done with the "bullet", that is, with a heavy lead object that the seamen plucked into the sea hung from a calibrated rope. As soon as the "bullet" reached the bottom, the depth appeared directly from the calibration of the rope. This arrangement still exists in some yachts. The big...
100W HiFi Audio Amplifier Circuit
This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power supply must be symmetrical so that no electrolytic capacitors are needed at the outlet....
Plant-Pot Water Level Indicator Circuit
A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower. The circuit of the device is shown in Figure 2. The water detection is made from the bottom...
Analogue Sound Preasure dB-Meter Circuit
The best human ear can capture sounds from 20Hz to 20KHz. These limits are known to be the broadest that can exist. Normally the normal limits range from 100Hz to about 13KHz and depend on the age and health of the individual. We for our measurements and to have a good accuracy we will get the limits of 20Hz to 20KHz. A sound to be heard does...
DIY HV Variable Capacitor
DIY PMA Alternator Plans
Digital Signal Integrity