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

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45 views

Can I use a series crystal in an parallel crystal optimized oscillator?

Based on this application note from Maxim Integrated in section "Resonance Mode": "Crystals have two modes of resonance, parallel and series, and all crystals exhibit both resonance modes. The ...
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1answer
36 views

Transistor saw-tooth oscillator. Saturation issue using LTSpice

I'm currently designing a saw-tooth oscillator that should be frequency adjustable, I don't want to use potentiometers, so it has to be voltage controlled. The frequency is controllable in the circuit ...
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1answer
72 views

Colpitts Oscillator Current and Frequency

Apologies if this has been asked before, but I couldn't find answers to my specific questions. I built a transistor based Colpitts Oscillator and I've been confused by the difference between the ...
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2answers
38 views

VCTCXO control voltage circuit recommendations?

I'm building a frequency calibration rig. Right now, I've got a fixed TCXO and it has an uncalibrated drift versus GPS of around 0.185 ppm ±50 ppb. I'm prepared to simply subtract 0.2 ppm from the ...
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1answer
93 views

Make: Electronics (Experiment 11) LED blinks only once

There is one more question about Experiment 11 from "Make: Electronics" by Charles Platt. The trouble is that my LED blinks only once, when I connect circuit to power source. (I tried 6V, 9V and ...
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2answers
99 views

NEED HELP: Oscillator Error and PIC24F stopped working

I have a 30MHz Crystal Oscillator to clock a PIC24FJ128GC010 Controller. I am programming in MPLAB X. My idea is to generate a pulse on one of the I/O pin toggling. But unfortunately, I cannot do so. ...
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1answer
62 views

help related to frequency of schmitt oscillator

I have seen the CMOS Schmitt waveform generator circuit (i.e. figure 2nd) from the following link http://www.electronics-tutorials.ws/waveforms/generators.html I tried to simulate the circuit in ...
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1answer
61 views

Crystal oscillator frequency Vs size?

What is the relationship between crystal oscillator frequency Vs Die size? Why it is smaller Die size over the high frequency ranges and bigger Die size in lower frequency ranges?
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4answers
5k views

Why do we use 32.768 kHz crystals in most circuits?

Why do we use 32.768 kHz crystals in most circuits, for example in RTC circuits? What will happen if I use a 35 or 25 kHz crystal? I assume because the IC internal Xin, Xout pin circuitry should be ...
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1answer
48 views

How does this step up oscillator actually work?

I watched a Dave jones video on an energy harvester but I'm trying to figure out how the front end of this circuit actually resonates and how that steps up some small input voltage. Is it a function ...
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1answer
55 views

Can someone verify my EL wire oscillator?

I'm pretty new to electronics, but my latest project is a circuit with two "frames" of animation that I make out of EL wire, and I want to build a circuit to switch between them every 2-3 seconds or ...
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1answer
25 views

Astable oscillator with voltage dividers as source voltage?

This is a part of a larger circuit, which will eventually become an SMPS. I can't even seem to get the oscillator to work. The output of the transformer is 12V The idea here is to supply each ...
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1answer
55 views

Is there any relation of ADC's conversion rate with its current/power requirement?

I'm working on a ADC-AD9266 which gives output at a reference of Data Clock Output (DCO) whose frequency is same as that of ADC conversion rate which also the frequency of Clock. f(clock) = f(DCO) = ...
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0answers
35 views

Buck Converter power supply based on astable oscillator and zener diode feedback?

simulate this circuit – Schematic created using CircuitLab I've asked several theoretical questions about this before, but I've assigned values and changed my circuit quite a bit. The ...
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1answer
118 views

Understanding Royer oscillator (for wireless power transfer), (specially mosfet gate driver circuit)

I need to understand how exactly this circuit works, there is not much references and books on those circuits, they're used as "power" oscillator for DC AC conversion for wireless. i finally found ...
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2answers
36 views

Unexpected output from astable multivibrator?

After following an answer to a question I asked here I created this circuit... simulate this circuit – Schematic created using CircuitLab This is the output on either of the ...
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3answers
238 views

Why isn't this astable multivibrator oscillating?

This is the schematic for a modified astable multivibrator I've built. I incorporated the diodes in order to get a sharper rise time, and therefore produce actual square waves. Principle of ...
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2answers
103 views

Linear Oscillator Frequency Problem

I was doing one of the problem sets when I stumbled upon this gem. I know that for oscillation to occur, the gain has to be greater than 1. The loop gain I computed is Could anyone suggest any ...
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3answers
72 views

Series LCR experiment

i am doing a series LCR experiment for measuring the resonant frequency taking, R= 100 ohm; L= 40mH; C=0.1uF. I am using a 10KHz audio oscillator having 10V p-p as the input. I have fixed the input ...
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1answer
73 views

stm32f4 HSE crystal

I'm trying to set up an HSE for my STM32f4, using this crystal. but there are 2 pins : OSC_IN and OSC_OUT, but my crystal only has one output. So what do I link OSC_IN and OUT to ?
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3answers
108 views

An alternative way to make a VCO?

from what I am able to understand, a voltage controlled oscillator is "controlled by a voltage" when this voltage is applied to vary the value of the tank circuit: eg this could happen by applying ...
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3answers
113 views

Can we use use an oscillator as a low power source?

Is it possible to make an oscillator (or buy an oscillator IC) that can give directly (without using a power amp) up to 2W (or even 1W) of power? And if not, then what stops oscillators from getting ...
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1answer
49 views

Issues with RF transmitter project

I've constructed a RF transmitter circuit and have been getting numerous problems. after modelling the circuit on a breadboard and testing it we got unexpected readings. these include 411.5hz ...
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1answer
77 views

Buck converter controlled by a BJT based astable multi-vibrator with zener-based feedback?

simulate this circuit – Schematic created using CircuitLab This is my rough sketch for a buck converter controlled by a BJT based astable multi-vibrator with zener-based feedback. Before ...
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1answer
60 views

Calculating RC oscillator frequency

I'm working through an old Popular Electronics article, trying to apply and learn some of the math behind the project. Math for the clock pulse generator frequency has me stumped; wondering if anyone ...
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2answers
46 views

Can rms voltage change when peak to peak remains constant?

Can the rms AC voltage change with frequency? I have connected a DSO to the audio oscillator(having 10V p-p). Peak to peak voltage remains constant on changing frequency(10 Hz to 100KHz) but on ...
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3answers
92 views

Sawtooth generator adjustable from 100MHz-500MHz

I need an easy circuit that will generate sawtooth waves at adjustable 100MHz-500MHz (preferably set by a resistor) from 0V going up to 5V. The waves themselves does not have to be perfectly linear, ...
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2answers
228 views

Understanding a 2 transistor oscillator?

I asked a question here about why I was getting a sawtooth wave from a two transistor oscillator. While that question is answered, I don't understand how the circuit produces oscillation in the first ...
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1answer
135 views

2 NPN Transistor Square Wave Oscillator?

I have built the circuit found here. I substituted with 22K resistors at R2 and R3, and substituted C1 and C2 with .022uF capacitors. These are all the components I have lying around. Everything ...
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1answer
43 views

How can I objectively compare TCXO performance?

I would like to evaluate an alternate TCXO used in a GPS receiver circuit. Our current TCXO works good but I'm looking to test a lower cost alternate. The alternate part is Epson TG - 5035CJ / CG / ...
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1answer
104 views

PIC18F4520 failed using internal oscillator at 1MHz , please help thank you

I am wishing to use the internal oscillator of the pic18f4520 at a frequency of 1Mhz , what i wish to achieve in the end is to use to control a servo. ...
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0answers
39 views

Variable frequency oscillator

How can I design a Variable frequency oscillator, in the range of 2-40 MHz? It must output a square or pulse wave (0-5V) and the frequency adjustable by a potentiometer. I tried this with a 555, ...
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2answers
63 views

Measuring the dampening sinusoidal wave of a simple LC Tank circuit?

I've been trying to do the simplest of things...measure the decaying sinusoidal wave of a LC Tank circuit on a breadboard. I've created an "inductor" out of a coil of copper wire I wrapped around a ...
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1answer
75 views

Wireless Power Transfer Circuit Theory

I made this circuit, and it is working fine. But didn't understood the theory in it. How is it putting a frequency in the coil? It did not match with any of the oscillator circuits. And also it is not ...
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3answers
165 views

external crystal not working but internal clock worked normaly in PIC18F45K22

I have designed a PCB based on the PIC18F45K22 microcontroller. I want to use an external crystal (4Mhz crystal with two 22pF capacitors). I can successfully program the code but the PIC won't run. ...
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1answer
126 views

Why does this Relay not oscillate

I have built the above circuit. The relay switches once, but then stops. Why does this not oscillate, as the current is broken every time it connects?
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1answer
168 views

LEDs driver circuit

I was wondering what is the role of this type of circuit connected to LEDs. I found it in a LED torch supplied by 2xAA batteries. Is it an oscillator? Is it only an energy trick? What are the ...
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1answer
29 views

Limited Wien-Bridge Oscillator Amplitude

I've already seen a similar question but the circuit was a little bit different. My question is simple: how do I calculate the maximum amplitude of the oscillation at Vo, as a function of the ...
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1answer
125 views

PWM with Oscillator does not dim LED display as expected

I have a fairly successful attempt so far at driving an LED display with an Arduino Mega 2560. The Display sequences work well on their own and the Arduino seems to be doing its job sending the ...
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0answers
61 views

RF VCO not O-ing [duplicate]

I am trying to set up this VCO: http://www.crystek.com/microwave/admin/webapps/welcome/files/vco/CVCO55CL-0600-0880.pdf I've set it up as follows: I'm trying to get between 400 and 800 MHz. There ...
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1answer
109 views

Why does a Colpitts oscillator oscillate at a particular frequency?

The feedback network used in the Colpitts oscillator is an LC circuit is shown below. I understand that the phase difference between the terminals 1 and 3 is 180 degrees. Also the amplifier output ...
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0answers
62 views

Problem with crystal oscillator based RF circuit

As a little experiment, a friend and I are trying to get a crystal oscillator based transmitter and receiver to work. So far we're having no luck. Here are the wiring diagrams: We once got the ...
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1answer
108 views

Need help understanding oscillator circuit

simulate this circuit – Schematic created using CircuitLab Does anyone know what type of oscillator is this and how this works?
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1answer
89 views

Oscillator and output load

For the Ethernet application in my design using RMII interface, I need to drive two CMOS loads (two reference clock pins, one of a Freescale Kinetis K60 Microcontroller and one of a TI's PHY chip) ...
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2answers
149 views

My Chua's Circuit is flatlining (i.e., malfunctioning)

I tried to build a Chua Circuit, but it doesn't appear to be working as expected. The problem is that, while it's supposed to be an oscillatory circuit, I see no oscillations. Refering to the diagram ...
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1answer
38 views

Microwave oscillator conditions

The conditions for a negative resistance microwave oscillator are (2-port): \$K < 1\$ (unstable device) \$Γ_{in} \cdot Γ_g = 1\$ (condition for oscillating input port)(generator side) \$Γ_{out} ...
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0answers
29 views

Are there any sound design guidelines for high-loudness piezoelectric sirens?

This is a somewhat tricky question so if the title is not clear please correct it. I have disassembled a siren used for auto and home alarm. It was originally driven by a digital circuit with lots of ...
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22 views

How Q-factor scales with MEMS Oscillator size

MEMS oscillators typically have lower quality factors that quartz crystal resonators, so I'm guessing the scaling law is reducing the size reduces the quality factor. But what is the exact ...
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1answer
51 views

Sustaining amp circuit for MEMS oscillator

A MEMS oscillator can be modelled as a lumped mass-spring-damper with a high resonant frequency and Q factor. According to Wikipedia "All commercial MEMS oscillators use electrostatic transduction". ...
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58 views

Can a crystal oscillator be used instead of a ceramic filter?

For my FM radio circuit i require a 10.7 MHz ceramic filter. When i asked for it in a shop he gave me a crystal oscillator of 10 MHz value. Can i use the oscillator instead of the filter in my ...