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Crystal Oscillator Circuits
Crystal Oscillator Circuits
Switchable Output Crystal Oscillator
This oscillator circuit permits crystals to be electronically switched by logic commands. The circuit is best understood by initially ignoring all crystal..
Crystal oscillator using TTL
I like the circuit, because it is good and enjoy. It just the signal status ""1"" and ""0"" only. And frequency generator is..
Oscillator astable multi-vibrator with Crystal controller
An oscillator circuit of this nature. Often used as a clock circuit. This circuit uses a million crystal frequency control with stability. And..
Pulse Generator Oscillator 32.768KHz by watch crystal
My Friend need to like a Pulse Generator Oscillator circuit that stable frequency at 32.768KHz,for digital cmos binary counter, so he tell to me even low..
50Hz 60Hz Frequency Generator Circuit Using Crystal Oscillator
50 Hz 60 Hz frequency generator circuit using crystal oscillator You can generate 50Hz or 60Hz using this frequency generator. This oscillator..
COLPITTS 1 To 20 MHz Crystal Oscillator
Colpitts 1MHz To 20 MHz Crystal Oscillator Circuit This is a simple Colpitts crystal oscillator for 1 to 20 MHz, PARTS..
Crystal Controlled Oscillator Circuit
Crystal Controlled Oscillator Circuit This general purpose signal source serves very well in signal-tracing applications. The output level is..
Advantages and challenges of third-overtone IC crystals
ICs with on-board oscillators requiring low-frequency fundamental crystals are commonplace, but nowG‚IC frequency multipliers require the higher frequencies of third overtone crystals. Compared to its fundamental implementation however, the third-overtone (3OT) crystal oscillator is more complex, with different crystal characteristics plus additio
Quartz Crystal Oscillator and Quartz Crystals
Electronics Tutorial about Quartz Crystal Oscillator including Harmonic, Overtone, Pierce Oscillator and Crystal Quartz Oscillator Circuits..
Colpitts Crystal Oscillator
Hey, Just wondering how to choose my L,C,R variables to achieve a desired frequency. Do I just choose any combination that yields X Mhz = 1 / ( 2pi *..
DIY Crystal Oscillator Circuit
A very simple DIY crystal oscillator circuit which use a quartz for frequency stability and a good rf transistor. Use a 2-nd or 3-rd harmonic crystal, for..
Quartz Crystal Oscillator Circuit
This quartz crystal oscillator circuit has greater stability than a parallel resonance circuit. It generates frequencies up to 30 MHz or even higher if you use BFR91 for T1, T2 transistors and reduce R1 R2 values. The MOSFET buffer insulate the oscillator from any connected circuit.
An oscillator is an amplifier with a feedback loop from output to input. Barkhausen criteria states that for oscillation to occur the product of the gains around a loop must be equal to or greater than unity and that the sum of the phase shifts around the loop must be a multiple of 360 °. Before beginning a design or purchase of an oscillator ther
Low-Frequency Crystal Controlled Oscillator
The RF engineer sometimes has to look for an instrument that will check a low frequency quartz crystal unit reliably and rapidly. This is a difficult piece of equipment to find and the engineer often has to consult an electronic circuits handbook for the schematic of a circuit that will perform the task. Unfortunately, there aren`t many such circu
crystal oscillator circuits
The circuit below is a standard oscillator of the Colpitts variety. Similar circuits have been used in many ham radio homebrew transmitters. This particular circuit should function well at frequencies from 1500 kHz to 8000 kHz. For use on lower frequencies, the values of C1 and C2 might need to be increased. If you`ve never built a circuit from a
The schematic above 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...
Armstrong Oscillator using a crystal
This circuit represents another version of an Armstrong Oscillator. This particular example uses a crystal in addition to the LC tank circuit used by the previous Series-Fed Armstrong Oscillator. By definition the Armstrong Oscillator uses a tickler coil for feedback, from the tuned circuit, as seen in the schematic. This oscillator is the shunt-
The circuit is only suitable for fundamental crystals as there are no mode suppression components. The oscillator transistor Q104 is cutoff most of the time except for a short period at the peak of the crystal current waveform. Q103 regulates the dc collector current of the oscillator transistor Q103. The dc collector current of Q104 and hence the
Crystal Sine Wave Oscillators
Where good frequency stability is required, in applications such radio transmitters, basic LC oscillators cannot guarantee to hold their frequency without some drifting, which can be caused by quite small changes in supply voltage (although stabilised power supplies help avoid this) and changes in temperature. The effects of resistance and stray
Safe Oscillator For Watch Crystals
This circuit was developed to allow watch crystals to be used in an existing CMOS oscillator circuit that was to run from a 12V supply. The problem is that these crystals only work up to a supply voltage of about 6V. Any more than that and the crystal will be over-driven, causing it to shatter. This circuit solves the problem by using LEDs 1 & 2 a
Switchable Output Crystal Oscillator
This oscillator circuit permits crystals to be electronically switched by logic commands. The circuit is best understood by initially ignoring all crystals. Furthermore, assume that all diodes are shorts and their associated 1kO resistors open. The two 1kO resistors at the non-inverting input of IC1 (LT1016) set the output to half the supply, ie,
Using a VCXO (Voltage-Controlled Crystal Oscillator) as a Clock (CLK) Generator
The term VCXO stands for Voltage Control Crystal Oscillator. The frequency of such an oscillator can be adjusted by a small amount through changing the control voltage. VCXO CLK generators have been used in various applications, such as digital T..
Replacing Crystals and Ceramic Resonators with Silicon Oscillators
A short note describing how to replace crystal and ceramic resonator clock circuits with silicon oscillators and highlighting some of the technical advantages offered by these devices in microcontroller clock applications..
Pierce type crystal oscillator circuit
The Tuna Tin 2 was originally designed by Doug DeMaw, W1FB in 1976. It appeared in QST, and was subsequently built by hundreds of QRPers, who were attracted to the project by the relatively easy parts availability. In fact, at the time of publication of the article, you could stop by the local Radio Shack and pick up everything needed except for t
The frequency of a crystal-controlled oscillator is held constant to a high degree of accuracy by the use of a quartz crystal. The frequency depends almost entirely on the dimensions of the crystal (essentially its thickness); other circuit values have comparatively negligible effect. However, the power obtainable is limited by the heat the crysta
I currently have three: a really old optoelectronics Opto-7000 which I don`t use much, a newer Mitronics MIC-1028, and my most recent acquisition, a used Tektronics 2236 `scope purchased at Dayton 2009, which has a very handy frequency counter built-in. I was working on a recent project and found the Tektronics and theMitronics counters were...
Circuit Crystal Oscillator/Amplifier
This oscillator is a variation of the oscillator presented by Ulrich L. Rohde, DJ2LR, in his article "Evaluating Noise Sideband Performance in Oscillators", Ham Radio, October 1978, Page 51. The original circuit is at the bottom of the web page "4 MHz Oscillator" in the Super Receiver section of this web site. The article states the above oscilla
Crystal Doubler Oscillators
27MHz crystal oscillator circuit
The 27MHz crystal oscillator circuit is as shown in the figure. The R1, R2, R3 are the biasing resistor, the C6 is the bypass capacitor, the voltage division circuit is composed of the C1, C3, C4 and C2 to control the oscillation strength. The L1 is the high-frequency choking coil which has the filtering effect. The quartz crystal is in the...
The making circuit of crystal oscillator 80mW F.M. transmitter
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