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Data Bus Circuits
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Video Wall circuits
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8051 / 8052
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555 Timer Circuits
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H Bridge Circuit
Interconnection & Timing
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4 Band Resistor
5 Band resistor
6 Band resistor
SINE WAVE OSCILLATOR
Rf = 100 k preset - The slider is set about a quarter of the way round. This is used to control the gain. The gain should be as small as possible consistent with the oscillator starting up reliably. The zener diodes limit the oscillator output by decreasing the amplifier gain if the output rises above their breakdown voltage. They also decrease th
The Clapp oscillator is one of several types of electronic oscillator constructed from a transistor (or vacuum tube) and a positive feedback network, . Meissner (Armstrong) Oscillator The Meissner oscillator circuit is a harmonic (sinusoidal) oscillator consisting of an active electronic element (transistor, elec
Oscillator circuits 5
Audio test oscillator audio test oscillator circuit, This generally results in a square wave if the frequency of oscillation is low enough relative to the amplifier`s bandwidth Crystal Controlled Oscillator schematic of a low frequency sine wave oscillator featuring low distortion, wideband operation and crystal control. The circuit, originally dev
RESISTIVE-CAPACITIVE (RC) FEEDBACK OSCILLATOR
A 440O scillator Version X
LM359 Voltage Controlled Oscillator Circuit
Voltage controlled oscillator (VCO) is similar to a voltage to frequency converter (VFC), an oscillator which its output frequency is determined by a control voltage input. This is the figure of the circuit; Where d is the amplifier input voltage = 0. 6V, h=hysteresis of DM1474 (typically = 1V). R2 must beequal to 2R1 for proper operation. Using th
Checking out the Pierce oscillator
The Pierce oscillator is a very simple circuit and as with the ring oscillator also uses inverters (actually just one inverter will do). The principle of operation, however, is very different. While the ring oscillator exploits the incremental propagation delay through the series of inverters, the Pierce oscillator puts the inverter/gate into the
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
µP-Controlled Oscillator Delivers Rock-Bottom Distortion
Function generators often play a critical role in the design, testing, and operation of encoders, modulators, demodulators, and measurement instruments. Here`s an inexpensive way to build a bus-controlled sinewave oscillator that has downright low distortion. The circuit generates a sinusoidal output with typical second and third harmonics down fr
Swept sine oscillator has quadrature output
Signals with a know frequency but unknown phase may be detected using an in-phase and a 90 ° shifted reference signal, as frequently used in lock-in amplifiers, synchronous detectors, and frequency-response analyzers. The 90 °-shifted signal is called the quadrature signal. By multiplying the received signal with the reference signals, the low-pas
Triangle/Square-Wave Oscillator Serves Dual Purpose
In conventional triangular-wave oscillators, hysteresis from positive feedback in the Schmitt trigger determines the voltage levels and amplitude of the triangular waves. With this topology, it`s difficult to independently vary the voltage levels and amplitude of the output waveforms. To combat this limitation, a more versatile oscillator was...
Low-voltage oscillator features increased spectral purity
A common problem in crystal sinusoidal oscillators is the excitation of unwanted modes of the quartz crystal that degrade the spectral purity of the oscillator. This problem is significant in overtone crystals, particularly if the oscillator is intended for low-voltage applications. In this case, there`s a compromise between the operating point of
Analysis of a Digitally Controlled Wien Bridge Oscillator
It uses standard components, gives a good sine wave and is fairly immune to the type of op ampit is designed around. It can, however, be misunderstood, and over simplifications as to its operation can leave the designer thinking that it is not as well trained as originally thought. In pursuit of gaining an understanding of our trusty friend, it...
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...
Negative Charge Pump with Ring Oscillator
In principle, the square wave oscillator doesn`t have to be a 555 timer, it could be a ring oscillator using inverters as you propose. In practice, using 4000 series CMOS logic for example, the negative output voltage produced would not be able to provide a great deal of current due to the current sourcing limitations of the IC. If the amount of...
oscillator Is this a suitable sine wave osc? how would I control the frequency
As I`m working from a single power supply and I`m trying to keep the design small, I`ve been using the LM386n-1 IC. Also, how would you suggest I control the frequency, which component value should be changed to achieve this - I`ve tried messing with all the resistors to change the pitch, but theyall seem to be interdependent. And this is what...
Using microcontroller as oscillator for high voltage power suppy
Using the 555 timer as an oscillator in the high voltage power supply section. Can the design be changed to use an output from the micro-controller to generate an oscillating signal instead of the 555. The first question is that would such a design work If it works, is there a particular reason why a 555 timer is used in the design
transistors Low power low voltage slow (0.1Hz) oscillator
The power supply varies, and the circuit must operate on under 10uA of current (not counting charging the cap). It triggers an SCR every 10-30 seconds as long as the power supply is above 1. 8VDC, and must operate across a range of 1. 8 and 7. 0 VDC. The timing isn`t critical - around 10-30 second intervals to trigger the SCR is fine (a short...
transistors Problems with Wien Bridge oscillator circuit simulation in Mutisim
Build a Wien bridge oscillator that oscillates at 2. 1kHz and that can be switched on by a transistor. The reason for me placing a transistor switch in the circuit is so that I can turn the oscillator on and off from a PIC MCU. However, when I build the simulation in multisim, I get an DC output voltage of 3. 0mV and an. I want an output voltage...
Op Amp based Hartley oscillator
Build an oscillator that will satisfy a few requirements. The main requirement is to have exactly one capacitor. Another one is to have high Q and sine wave output. I am considering Hartley`s oscillator design. Since it has only one cap. I don`t what to built the biasing network and select a transistor that will suit the oscillator`s needs, so I...
oscillator How to control a speaker
As far as we are concerned we are looking for a function generator or a VCO (voltage-controlled oscillator). We would love to know which specific component we need. EDIT: What we are actually trying to achieve is to make two sine sound waves. One is constant and the other can be changed by hand with a potentiometer or so. For example if the consta
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,...
transformer Low voltage oscillator for joule thief
A transformer with 2 input leads and 3 output leads. I hooked up an LED to 2 of the output and put a dead AA battery on the input and the LED blinked for a second. I have no data on the transformer, but I am wondering if it is possible (and if so what is the schematic or instructions on how to do it) to put a low voltage oscillator before the...
oscillator HEF4060B counter doesnt count
The first problem is with the 16Mhz xtal the thing doesn`t even start to oscillate. But that`s a secondary problem. If I replace 16MHz xtal with a 11MHz one (or less) the oscillator starts. I can see with the `scope that I have a nice 11Mhz sinusoidal waveform on the pin 11, and I see a not-so-nice square-ish waveform on the pin 9 (so, I imagine t
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...
Can a Hartley Oscillator be built using Fixed Inductors
An Hartley Oscillator circuit can be made from a pair of series connected coils. I had a couple of 22mH fixed inductors, which I hooked up on a breadboard with the other needed pieces. When I test the transistor amplifier independently, it seems to be working. However, there is no sign of oscillation in this circuit. So my ignorant question is,...
Astable Oscillator Circuits
Colpitts Oscillator Circuits
Crystal 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...
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