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8051 / 8052
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H Bridge Circuit
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4 Band Resistor
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Reverse Bias Oscillators
There are a number of npn transistors that will oscillate in the audio range when reverse biased. Minimum supply voltage is 7V for low power transistors such as BC109, BC238 and 2N2222A, it becomes 12V for medium power transistors such as BD139 and is 16V for power transistors as BUX22 and 2N6543. Current drain is 4mA at 9V and frequency of oscill
Low-distortion Audio-range Oscillators
Op Amp Wien-Bridge Oscillator
The opamp Wien-bridge oscillator provides a nice view into classic oscillator design using feedback analysis. Feedback analysis reveals if your circuit is stable (well behaved) or unstable (may oscillate). When designing amplifiers (especially high-speed ones), the trick is to avoid the conditions that make the circuit oscillate. When designing os
32768 hz quartz oscillator
hi this my 1st post here. topic is a watch crystal oscillator for PIC (microcontroller). i do not want to use logic gates. here the circuit (a thread..
FET Based Phase Shift Oscillator
Hi I need help with design of a FET based wien bridge oscillator and simulate it using pspice. Any suggestion?..
wein bridge oscillator
hello, i am doing a practical on lm 741. i want to make it to use it as an wein bridge oscillator.the value of c1=c2=0.01uF, R1=R2=3K, Rf=2k, Ra=1k.acc..
hi Im trying to construct a Hartley Oscillator. I am using a bypassed common emiter and i am trying to get a 200kHz 2Vp-p oscilation. With a BC547B..
Ceramic Resonator Oscillator Circuit
I am looking to build a oscillator from a ceramic resonator. I know that a single digital inverter can be used to form a Pierce oscillator (hundreds..
Wein bridge oscillator again
Hi I am testing wein bridge oscillator and I looking to make it work. I have study the page below, but there are some concept i do not understand..
two Colpitts oscillators
Hello, I have queastion about type of the osclator I found on wikipedia here: File:NPN Colpitts oscillator collector coil.png - Wikipedia, the free..
Oscillator configuration in transmitter
Hi Expert, I recently receive some question on an oscillator in some AM transmitter. I searched the web and find this circuit. According to author,..
Colpitts oscillator formula
FET Colpitts Oscillator (Microwave)
Hi there. I`ve building a 430Mhz Transmitter for microwave. And for some strange reason i couldn`t get any output frequency from my circuit. I`ve..
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..
Hartley oscillator design with opamp
Hi! I made an opamp hartley oscillator using a certain electronics simulator and even though simulation takes place I`m unable to get any oscillation..
Questions about colpitts oscillator design
amplifier input and output impedance, load and source resistance are strongly mutually dependent in the CC circuit. That`s a reason, why "impedance matching" doesn`t achieve results representative for the circuit operation. Analyzing the circuit as CB with virtual ground, as suggested by LvW, gives a better decoupling of both amplifier ports. Impe
Injection-lock a Wien-bridge oscillator
A low-distortion Meacham-bulb-stabilized Wien-bridge oscillator is used to acquire the FFT of a pure sinusoid of about 5 kHz..
Oscillator keeps THD below 1 ppm
The Wien-bridge sine-wave oscillator uses a light bulb to stabilize its amplitude. The circuit in Fig 1 doesn`t have a light bulb; it sports several enhancements that lower its distortion and generate a test signal pure enough for testing modern op amps and high-resolution A/D converters. IC1 and associated components form the Wien-bridge and func
Feedback Oscillator Positive feedback is used in oscillators to maintain running or oscillating. An oscillator is basically an amplifier which has a feedb..
1 KHz Frequency Wien Bridge Oscillator
The circuit was designed to create an electronic oscillator known as Wien Bridge Oscillator which can be used for the creation of low frequency sine wave..
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..
Low Frequency Wien Bridge Oscillator
The circuit was created to produce an oscillator operating at low frequency for use in the production of electronic music and experimenting and testing to..
Mini Metronome by 555 Timer/Oscillator IC
This mini metronome gives a linear scaled output and 40 to 208 beats per minute. 1- Q1 and Q2 transistors provide linear frequency variation of IC1 depend..
Op-Amp-Based Wien Bridge Oscillator
The circuit was designed based on the functionality of an op-amp to create a Wien bridge oscillator to generate sine waves in the frequency range of 15 Hz..
Voice Transmitter Via FM Band 2 VHF by Hartley Oscillator
The circuit was designed to operate a frequency modulation voice transmitter over the FM band 2 frequency range of VHF. Transmitter an electronic device..
LED Torch Uses Blocking Oscillator
This simple LED torch is driven by a 2-transistor blocking oscillator which steps up the voltage from a 1.5V cell. It relies on the inherent current limit..
Simple Oscillator / Pipe Locator
Sometimes the need arises to construct a really simple oscillator. This could hardly be simpler than the circuit shown here, which uses just three compone..
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..
Very Low Power 32kHz Oscillator
The 32-kHz low-power clock oscillator offers numerous advantages over conventional oscillator circuits based on a CMOS inverter. Such inverter circuits present problems, for example, supply currents fluctuate widely over a 3V to 6V supply range, while current consumption below 250 µA is difficult to attain. Also, operation can be unreliable with
100Khz sine oscillator
All you really need is a decent opamp, three resistors, three caps. Make one of the resistors adjustable, otherwise all components same value. It`s called a phase shifted oscillator and it has very good, very low distortion. The gain of the amplifier is set by two additional resistors. That`s one way. Another is a simple 555 square wave oscillator
oscillator circuit with opamp and zener diode
Looks like a schmitt trigger oscillator. By the way the resistors and capacitor are used it is probably a saw-tooth wave generator with R2 & R3 determining the slope of the rising and trailing edges. The zener helps control the amplitude between 0 to 3V OR maybe it chops off the tops of the sawtooth wave thereby creating an output that has a...
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...
Digital Signal Integrity
Interconnection and Timing of Digital Circuits
CMOS Circuits Tutorial