Varius Circuits
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This circuit is an astable multivibrator, or oscillator. The two transistors are cross-coupled in such a way that the circuit switches back and forth between two states. In one state, the base of Q1 is about one diode drop above ground, allowing a base.... -
When the oscillator starts up, Q2 is conducting; the current comes from the capacitor, charging it until the voltage across it is large enough to get a current across the inductor. As the current across the inductor peaks, the output voltage rises (the.... -
This circuit is an oscillator that generates a square wave. The op-amp starts with its two inputs in an unknown state; let`s say it starts with + slightly higher than. The op-amp greatly amplifies this difference, bringing its output to the op-amp`s positive.... -
This example shows a tunnel diode used to make an oscillator. The two resistors bias the diode in its negative resistance region. As the current begins to flow through the inductor, the voltage across the tunnel diode increases until it hits the negative.... -
This circuit is a voltage-controlled oscillator, which is an oscillator whose frequency is determined by a control voltage. A 10 Hz sawtooth oscillator provides the control voltage in this case; this causes the frequency to rise slowly until it hits a.... -
This article explains the construction and working of feedback oscillators with detailed description of Wien`s bridge oscillator and phase shift oscillator along with their circuit diagram, basic components and practical application Oscillators are those.... -
A complete description is given upon generation of required frequency by using phase shift method along with the advantages and limitation against Wien`s bridge method of oscillations. Complete circuitry of phase shift oscillator is illustrated to describe.... -
Well, I try to follow an instructable for quiet a while now, but I still couldn`t understand its schematic.. its not that I don`t know what the symbo.... -
Above is the schematic of one oscillator circuit. In technical terms the oscillator is a Schmitt trigger relaxation oscillator. Above you`ll also find.... -
A form of relaxation oscillator which comprises two stages that are coupled so that the input of one is derived from the output of the other. Basically two amplifiers cross-coupled with regenerative feedback, in it`s most simplistic form. One of the.... -
An Armstrong Oscillator is a type of oscillator that uses a tickler coil which provides feedback from tank circuit. The Armstrong Oscillator is used to produce a sine-wave output of constant amplitude and of fairly constant frequency within the rf range..... -
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.... -
This circuit is designed to output both a sine wave and cosine wave. This particular design uses an operational amplifier. As shown in the schematic the output frequency is set by the component values as 1Hz. The first operational amplifier outputs a 1Hz.... -
A Hartley Oscillator is a style of oscillator that uses two series connected inductors or an inductor with a center tapped coil, along with a capacitor. The tank circuit is formed by the inductor and the parallel capacitor. An oscillator circuit requires an.... -
A Pierce Oscillator is a type of oscillator that uses a crystal instead of a parallel-resonant circuit [LC circuit]. A pierce oscillator also uses the voltage developed from a tap between two capacitors in the tank circuit, as shown to the right. range. Both.... -
A number of operational amplifier circuits are provided here that are set up to be squarewave oscillators. A squarewave is a Periodic Wave pulse train with a 50 percent duty cycle. The operational amplifier is really just a high-gain amplifier, so.... -
This circuit, using a minimum amount of parts generates a 10Hz sine wave [based on the component values shown]. The active components are generic devices and may be substituted as required. The passive component values set the frequency and should only be.... -
This oscillator circuit is designed to generate both a rectangular wave and a triangle waveform, around 1kHz to 10kHz. The first operational amplifier in the chain generates the square wave, while the second operational amplifier generates the triangle wave..... -
The classic Wien-Bridge oscillator, with incandescent lamp nonlinear stabilization, provides a low distortion sine wave source. A thorough and clear discussion of the Wien-Bridge oscillator is provided in Malvino`s Electronic Principles. Using an inexpensive.... -
Here is the design of an audio oscillator that runs at approximately 1 KHz. I don`t remember where I got this circuit, probably from EMFRD, since Wes`s book is a treasure trove of useful circuits. This handy oscillator can be used as a source of audio for.... -
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The Hartley Oscillator is an L C oscillator that derives its feedback from magnetically coupled energy in a tapped coil. Hartley oscillator are inductively coupled variable frequency oscillators... -
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.... -
The ARMSTRONG OSCILLATOR is used to produce a sine-wave output of constant amplitude and of fairly constant frequency within the rf range. It is generally used as a local oscillator in receivers, as a source in signal generators, and as a radio-frequency.... -
The beat frequency oscillator (bfo) is necessary when you want to receive cw signals. Cw signals are not modulated with an audio component, you remember, so we must provide one. The action of the rf amplifier, mixer, local oscillator, and IF amplifier is the.... -
The HARTLEY OSCILLATOR is an improvement over the Armstrong oscillator. Although its frequency stability is not the best possible of all the oscillators, the Hartley oscillator can generate a wide range of frequencies and is very easy to tune. The Hartley....
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This project fits more for custom made battery casing that can have more space to hide things inside. This switch with few alterations can be used for any other project as well but is designed based on e-bike needs! This project use a clever functionality of.... -
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.... -
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.... -
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.... -
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.... -
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,.... -
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.... -
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.... -
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.....
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