Questions tagged [oscillator]

A device or circuit that generates an AC signal at a certain frequency.

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How do the capacitor & resistor actually introduce a delay in the following oscillating circuit in terms of electron flow?

simulate this circuit – Schematic created using CircuitLab How, in terms of electrons, do the capacitor and resistor actually create the delay and still permit the oscillation given that ...
J R's user avatar
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555 Circuit for Spark Gap Lighter Not Functioning Correctly

I have a circuit designed and fabricated with the following schematic: The specific 555 timer I'm using is a NE555DR. However, when under power the circuit doesn't appear to oscillate and no spark ...
Charles Dean Modrich's user avatar
2 votes
2 answers
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Importance of load capacitance in 32.765 kHz crystals

I am designing a very low power portable device that has an RTC and I cannot choose a crystal for it. Most crystals on the market have 12.5pF load capacitance, however there are also 6 or 4pF crystals ...
Archimedes's user avatar
2 votes
1 answer
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How should I test an oscillator on a PCB?

How does one go about testing an oscillator that is designed on a PCB? I have worked with breadboards before, but never a PCB. On breadboards, I usually test a lead connected to an output. On a PCB ...
help_me_learn's user avatar
1 vote
4 answers
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LTspice: triangle wave circuit not producing any waveform

I've implemented this circuit in LTspice from this Triangle Wave Generator tutorial. Unfortunately, when I run the simulation, it doesn't produce a wave at all, just a flat VDC output. Any help would ...
Abstract's user avatar
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Converting a standard oscillator to a low-power square wave oscillator [closed]

I'm working on a project using a backscatter tag for soil sensing that is using an 5-18 GHz antenna, and a low power oscillator operating at 5-18 GHz toggling an RF switch. The oscillator option has ...
adarbonne's user avatar
4 votes
2 answers
196 views

For this particular Ring oscillator topology, will the circuit prefer to latch up or oscillate?

This circuit is chosen from Razavi's textbook Design of CMOS Phase-Locked loops In this circuit, where the outer inverters are weaker than the inner ones, does the circuit prefer to latch up or ...
Tong Su's user avatar
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3 answers
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How to connect oscillator to MCU for power saving operation

I have to connect an oscillator (RTV-104EF13P-S-10.000-TR) to an MCU (STM32G051F8P6) in order to have a more precise clock. The datasheet provides very little information about the ...
Harry's user avatar
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What are the necessary conditions to prevent latch-up problem for Oscillators?

In his chapter on oscillator design, Razavi discusses the issue of latch-up and proposes several methods to eliminate it. However, he doesn't provide explanations for these methods. Could anyone ...
Tong Su's user avatar
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3 answers
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If many radio waves can generate currents in the antenna ground circuit **simultaneously** I am wondering do they all get carried over to the tuner?

If many radio waves can generate currents in the antenna ground circuit simultaneously, I am wondering do they all get carried over to the tuner circuit?, but only the current whose frequency matches ...
Jack's user avatar
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How do I achieve the desired frequency with a Colpitts oscillator?

I would like to build an oscillator with frequency variation from 50MHz to 100MHz. I decided to use a Colpitts oscillator because I read that it is stable and easy to build. I built the circuit as ...
Jareeczek's user avatar
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1 answer
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Problem with LR oscillator

I am trying to make a self oscillating fluxgate transformer using an LR oscillator with an op-amp. I replaced the op amp with a square wave generator and the h bridge worked fine but when using op amp ...
Saso's user avatar
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Inverter Oscillator Ground Return

I have a PCB design for a guitar pedal with a DSP chip processing some audio signals that would normally run off a 32768 Hz crystal, but part of the guitar effect allows the user to change the clock ...
longlivetheDee's user avatar
-1 votes
5 answers
338 views

Sine oscillator at extremely high frequencies

I would like to make a "good" (doesn't need to be perfect) sine wave oscillator from 50 GHz to 1 THz, if possible with two outputs: one is \$\sin(2 \pi f t)\$, the other one would be \$\cos(...
mabeco's user avatar
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LM318 strange oscillations

I want to make a 100~200 kHz square wave signal. I tried with a Schmitt trigger oscillator . The circuit below worked well with another op amp but the slew rate was too low so a tried with the LM318 ...
sta's user avatar
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Do we need to provide same voltage for microcontroller I/O and oscillator?

I am using a PIC32CZ8110CA90208-I8MX-SL3 in my design. I am providing a supply of 1.8 V to VDDIO. The oscillator used is a DSC6011JI2B-012.0000. Can I supply 3.3 V to oscillator VDD and 1.8 V to ...
Hari's user avatar
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Equivalent impedance for R-C configuration in op-amp input

If I have a circuit like this, how can I obtain the loop gain, since the capacitors and resistors are not either in series or parallel? If the feedback resistance is \$R_f\$, then I have something ...
ludicrous's user avatar
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14 votes
13 answers
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Simplest practically buildable oscillator

What could be simplest practically buildable oscillator circuit? The meaning of "practically buildable" here is that it can be built without handpicked parts. For example, a reverse ...
hotmultimedia's user avatar
1 vote
1 answer
65 views

Modified astable multivibrator with sharp edges

I am designing an astable multivibrator that would avoid rounded output edges and also has a totem pole output, so it is able to drive a small charge pump. So I decided to replace a collector ...
Michal Podmanický's user avatar
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3 answers
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What happens to output of a crystal oscillator if the input it's given is an AC waveform instead of stable DC?

Some things I've read say the crystal acts as a filter and you still get its resonant frequency as the output and something else I read says feeding the crystal oscillator with a sine wave of the ...
Deoxal's user avatar
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3 votes
2 answers
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How is a resonant bandpass filter similar/different from a damped mass-spring oscillator? They seem to behave different in testing

Background I am using resonant bandpass filters as musical oscillators. One can excite an array of them at harmonic frequencies and given Q values for a note by, for example, running a burst of noise ...
mike's user avatar
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1 answer
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433 MHz crystal 3 feet pinout?

What are the pins A, B, C of this 433 MHz crystal oscillator? https://nexelectronics.in/wp-content/uploads/2023/01/433-MHZ-CRYSTAL-OSCILLATOR-1.jpg I suppose these are input, output, ground. Could ...
lastime's user avatar
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Sawtooth peak detector

I am trying to create a circuit for converting a variable frequency clock signal (with unknown duty cycle) to a pulse wave with an adjustable frequency-independent duty cycle. My approach is to create ...
kalj's user avatar
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4 votes
2 answers
324 views

How can I drive an LC tank with a transistor?

I've been exploring the idea of making an induction heater. Mostly I see people using the ZVS circuit to do it, but I would like to get an understanding as to how you would do it if you had an ADC and ...
TrisT's user avatar
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Why does voltage spike when resonance frequency is matched with crystal oscillator?

I am learning to test the accuracy of specific frequencies of crystal oscillators using a function generator and oscilloscope. When you get closer the the actual frequency of the crystal the voltage ...
Qubit's user avatar
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2 answers
144 views

555 timer producing 3x expected frequency in astable mode [closed]

I’ve just started experimenting with electronics, and for my first project I made an oscillator with a 555 in astable mode. I used two 56k resistors and a 0.1 uF capacitor for the C1. I also included ...
Chickenguy5's user avatar
1 vote
0 answers
98 views

How does this type E oscillator work?

I recently watched this video (link below) that showed me a simplified circuit diagram for a "type E oscillator". I tried researching this, but I couldn't find much information on this. ...
EskimoJones's user avatar
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2 answers
110 views

How does a capacitor in an astable multivibrator turn off a BJT?

I've recently started learning about astable multivibrators. I understand that the capacitors in a circuit like the one below create the alternating current by charging up one at a time, and once they ...
EskimoJones's user avatar
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1 answer
88 views

Simple Collpits oscillator not working

I'm trying to make a Collpits oscillator. I've made a design that fits my resources and works in a simulation but does not work when assembled. I've checked every element and have no idea what to do ...
Jan Szwyngel's user avatar
1 vote
2 answers
63 views

Why is the inverting gain of this phase shift oscillator 8?

In this oscillator configuration, which I got from the textbook "Operational Amplifiers & Linear Integrated Circuits" by James Fiore (page 354, 3rd edition), since the gain of the ladder ...
lee_dong-eun's user avatar
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3 answers
138 views

Variable frequency sine generator

What is an simple option to generate a low freq. sine in range 10Hz to 200Hz? I tried to make a triangle and integrate it but I obtained a huge difference in amplitude as I change the triangle ...
Michal Podmanický's user avatar
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1 answer
71 views

How do I derive the frequency of an LFO circuit?

I'm attempting to solve why the frequency of an LFO, which is a Schmitt Trigger - Integrator LFO, seems to be about 7.13 Hz even when the reverse logarithmic potentiometer is set to its lowest setting....
Thxforhelping's user avatar
1 vote
2 answers
174 views

Oscillator's frequency way off LC prediction

I tried to make the simple Robinson oscillator given in the pictures below using cross-coupled NPN transitors attached to an LC tank circuit. The part that I have used is M2N4401. The issues I find ...
luiz_iniciante's user avatar
2 votes
1 answer
225 views

MOSFET ring oscillator LT SPICE

I am designing a ring oscillator using MOSFETS to create the inverters however, I am encountering problems with the output. Please check my understanding. Here is what I understand: the oscillating ...
help_me_learn's user avatar
1 vote
0 answers
24 views

How can I get a differential output as an input for another circuit on ADS?

I'm currently making a project on ADS for a differential pair oscilator: The desired output for this circuit is Vout2-Vout1.Now, I want to plug a buffer on this circuit, but I don't know how to ...
Gevezo's user avatar
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3 votes
4 answers
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BJT ring oscillator

I would like to build a ring oscillator with a BJT but the waveforms do not look correct. currently, I am using the following circuit: My question is how do I control the frequency while at the same ...
help_me_learn's user avatar
0 votes
2 answers
296 views

Astable Multivibrator Not Oscillating

I've been trying to get the Astable Multivibrator Circuit to work for a long time now, and I think I lack the knowledge to understand what's going on here. The situation is as follows: I've checked ...
Elektroney's user avatar
2 votes
0 answers
65 views

How many LC oscillators can you easily fit on a single chip?

I recently read this interesting blog post about 'thermodynamic computing' that tickled my fancy. The TLDR version is that the authors designed and built a circuit that can perform matrix inversion ...
Martin C.'s user avatar
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1 vote
2 answers
101 views

How to generate a sine wave that is in phase with a generated square wave at 1MHz for lock-in amplifier?

I am building a lock in amplifier (LIA) for fluorescence lifetime measurement using off the shelf components, after going through literature, I have decided to use square wave for excitation of the ...
Pranav Agumbe's user avatar
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1 answer
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How can I attenuate noise from synchronous divider and OCXO?

I am experimenting with a square OCXO, dividing its output frequency to 1kHz using a 4017 synchronous counter and feeding the output to a sound card using Spectrum Lab software. I can then record it ...
Ken90's user avatar
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0 votes
1 answer
56 views

Power supply coupling of inductive resonant sensors

I'm working on an array of sensors based on Peltz Oscillators connected to a micro to detect objects based on shifts in resonant frequency when a target object gets close to the inductor. In isolation,...
learnvst's user avatar
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3 votes
0 answers
83 views

What exactly is a "silicon oscillator"?

LT and Maxim (both now part of Analog Devices) have product lines of what they call "silicon oscillators", which are for the most part tunable oscillators with a very wide tuning range, but ...
Hearth's user avatar
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17 votes
9 answers
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Why not put a crystal oscillator inside the microcontroller?

Why not put the crystal oscillator inside the MCU itself, rather than using an RC internal oscillator? I could think of the following possibilities but not sure if they are valid: MCU manufacturer ...
Whiskeyjack's user avatar
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3 votes
1 answer
262 views

Unable to get my astable multi-vibrator working in LTspice

I'm trying to build a basic square wave oscillator using an astable vibrator made with an op-amp for my Intro to Circuits class. Unfortunately, I cannot get LTspice to simulate the oscillations. I've ...
Jgely's user avatar
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1 answer
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I am repairing an automotive board. I want to know about the manufacturer of a crystal oscillator

I want a datasheet for the below attached image crystal oscillator. It will be helpful if someone find it. I want to use same manufacturer crystal.
Resist Cap's user avatar
1 vote
2 answers
113 views

How does this oscillator circuit work? Inductor phase

I simulated in it LTspice software. The voltage waveform across capacitor C4 was sinusoidal. I know its some kind of oscillator but don't know how it's operating? I think the reason behind center ...
nitin shrestha's user avatar
0 votes
1 answer
486 views

Why are the second and the sixth pin of 555 timer named as they are?

Why is pin 2 of the 555 timer named trigger? Why is pin 6 of the 555 timer named threshold?
Adrish Chatterjee's user avatar
2 votes
1 answer
154 views

Why is my crystal oscillator (4 pin DIP 4 MHz unbranded from ebay) producing unusable clock signal waves?

I posted this on retrocomputing but they told me it would be better for me to post it here. I was trying to make a Z80 computer. I tried with Intel 8088 and failed because I am inexperienced, so I ...
Dragonite Brian 1024's user avatar
1 vote
1 answer
81 views

High voltage DC to AC oscillator circuit [closed]

I am trying to design a oscillator circuit that will convert ~10 kV DC at 60 hz to ~9-10 kV AC at 60 hz, and all the information I'm seeing is circuits that step up voltage. I wonder if making this ...
Bruce Smith 's user avatar
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1 answer
83 views

What is a slow clock oscillator embedded microprocessor (MPU)

I am using SAMA5D27C-D1G-CU in my design. In the signal description I can see that it has two oscillators. Main oscillator and slow clock oscillator. Please see the image below. I have couple of ...
Hari's user avatar
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