Questions tagged [oscillator]

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

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Ethernet port as a signal generator

I was wondering if it's possible to turn a PC into a signal generator through the ethernet port (or at least an amplitude-modulated sine generator). I specifically care about the ethernet port since ...
KKZiomek's user avatar
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Generating a clear sinusoidal wave through the oscillator to generate the "Ding Dong" sound

I am working on a project to try to recreate a close replica of the "Ding Dong" doorbell sound. I have yet to make the decay. (I would definitely appreciate if you have tips for that.) I am ...
user369928's user avatar
6 votes
2 answers
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Why is the frequency and voltage of my Colpitts oscillator lower on breadboard than LTSpice?

My colpitts oscillator I made on LTSpice oscillated at 5 MHz at a peak-to-peak voltage of 260V. When I put all the components down on my breadboard and measured it with a real oscilloscope, the ...
george_2roz's user avatar
2 votes
2 answers
116 views

Why do the diodes make a huge difference in an RC sinewave generator circuit?

In the following LTspice simulation of a sine wave generator circuit, it cannot oscillate without D1 and D2, but as long as D1 and D2 are added, (1+R5/R6)=1.5 can also oscillate (as shown in the ...
谢一鸣's user avatar
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The effect of input and output impedance

This picture shows the classical feedback system and this assumption about this system. "the input impedances of both the amplifier and the feedback network are infinite and their output ...
Serkan Kaya's user avatar
1 vote
2 answers
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Comparator Using Common Gate CMOS

I am currently in the process of designing and testing a CMOS Comparator based of a Common Gate Topology. Below is an extract of the ref circuit I am using: The authors in the paper mention "...
soccernismo's user avatar
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1 answer
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Subthreshold Operation for Beta Multiplier Circuit

I am currently in the process of designing a Beta Multiplier Circuit using 120 nm technology, and want to run the circuit in subthreshold operation with (Vgs < 4*Vthermal). Below are some captures ...
soccernismo's user avatar
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1 answer
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What is the rule for continuous oscillation of an RF circuit with integrated LC?

Circuit simulation software helps out many times from hard mathematical formulas. I designed most of the RF circuits with the help of LTS and Proteus. I have seen that they are good equally, but have ...
lastime's user avatar
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PIC MCU wont accept external oscillator

I have been trying to use a PIC16F684 with an external oscillator. I tried a few, changed capacitors, added series resistor - nothing. Right now I have a 10 MHz crystal connected with 30 pF capacitors ...
Ri Di's user avatar
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4 answers
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How do the capacitor & resistor actually introduce a delay in the following oscillating circuit in terms of direct current?

simulate this circuit – Schematic created using CircuitLab How, in terms of direct current, do the capacitor and resistor actually create the delay and still permit the oscillation given that DC ...
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
116 views

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
81 views

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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4 votes
2 answers
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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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2 votes
2 answers
217 views

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
-1 votes
1 answer
78 views

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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1 answer
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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
343 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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2 answers
105 views

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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1 vote
1 answer
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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
3k views

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
66 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
0 votes
3 answers
84 views

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
133 views

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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0 votes
1 answer
107 views

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
360 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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0 answers
44 views

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
146 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
104 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
0 votes
2 answers
116 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
0 votes
1 answer
90 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
64 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
0 votes
3 answers
145 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
0 votes
1 answer
75 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
180 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
257 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
25 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
1k views

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
306 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
105 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
0 votes
1 answer
58 views

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
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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
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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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