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

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34 views

Starship noise generator for Arduino

For one of my projects (pimped scale model of Battlestar Galactica) I'm looking for a sound generator, that simulates the noise of a starship engine. Something like this here: ...
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3answers
103 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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31 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
45 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
53 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
37 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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2answers
63 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
177 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
80 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
36 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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36 views

What is/How to find the default internal clock speed of a pic? (Specifically the PIC18f26K22 [closed]

I have a PIC18f26k22 and I am using the internal oscillator without changing any of its settings. Because I want to use PWM in my device, I need to know the clock speed. How do I find the default ...
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1answer
70 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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28 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
58 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
52 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
114 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
90 views

Why does this Relay not oscilate

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
129 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
23 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
109 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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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
77 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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51 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
94 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
85 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
129 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
35 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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21 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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18 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
36 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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1answer
50 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 ...
2
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1answer
102 views

npn-pnp oscillator questions?

for a couple of years I have been trying to make this one oscillator circuit. 10/10 times it does not work. The best result I can get is the led being constantly on and dimmable with the pot resistor. ...
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1answer
74 views

Esaki effect implementation on simple oscillator circuit

Hello guys I am trying to learn basic oscillator circuit with the help of this link. But when I connected components My lead is not blinking rather it is giving bright light.If Components I have ...
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1answer
69 views

Damped RLC Circuit Equation

I'm trying to measure the inductance of a toroid with the use of a 555 in astable mode. Hopefully, by putting the toroid in parallel with a known capacitor and driving the circuit with a low duty ...
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26 views

Square wave oscillator (up to 5kHz) from -40V to -10V (approximately)

I want to test a depletion mode TFT which has a turn on gate voltage of about -35V and consequently I want to show that this TFT can be used as an inverter and find the maximum frequency at which it ...
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2answers
73 views

bubba oscillator

i am trying to make a sine wave generator. the Bubba oscillator circuit given below should produce 53 Hz. according to the text book " Op-AMP for every one", the circuit should have gain = 4, and the ...
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0answers
45 views

PIC12F simulator: Why isn't the oscillator running?

I have written firmware for a PIC12LF1572 that I am testing in the MPLAB X simulator. The program runs and correctly responds to stimuli, except when it needs to wait for a timer interrupt. After a ...
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0answers
28 views

How to use external clock on STM32F205VC?

I'm using VisualGDB for stm32F205VC programming. I have an external clock on my board connected to OSC_IN and OSC_OUT that I have to use. How to switch to it?
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1answer
65 views

When we need external crystal for atmega?

I created microcontroller circuit, refers to most of circuit in internet. Which is it is using external crystal. As i know now, that atmega16 has internal oscillator by default 1MHz. So, ...
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2answers
104 views

Numerically Controlled Oscillator (NCO) Sample quantity

Ive been doing some research on NCOs and some initial information (or lack of information) is bugging me. Ive read a few articles on this topic: FPGA based NCO Blog on NCOs But i still don't ...
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56 views

Lc tank resonator vs. quartz crystal?

For Colpitts and Hartley oscillators, which is preferable to use: an lc tank resonator, or a quartz crystal? I've built Colpitts oscillators with both an lc tank circuit resonator, and with a quartz ...
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1answer
93 views

Operating frequency of microcontroller PIC18f4550

I am new to PIC Programming, and thought of blinking LEDs as my first project. Now I copied a code from net which blinks two LEDs and its working, the LEDs are blinking. My settings:- I haven't ...
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88 views

tunable oscillator circuit: get rid of the variable capacitor

In these days I'm doing some experiments with oscillators circuits; I've built an oscillator circuit which is tunable using a variable capacitor (the range in picofarad of this variable capacitor is ...
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1answer
78 views

How to convert this FM transmitter to receiver?

I made this circuit and it works properly but I need to make an FM receiver using the same idea of this circuit (common base). Would you tell me what changes should I make so that the circuit is able ...
2
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1answer
77 views

Calculating the gain and phase shift of a phase shifting circuit

I want to calculate the gain and the phase shift of the phase shifting circuit below. My approach is to derive equations to different meshes using Kirchoff's law, and then calculate the ratio between ...
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0answers
28 views

Clipped sine input for HSE clock input on STM32F303?

I am using a STM32F303 and need a very high stability clock ie around 1ppm over temperature. One of the modules I am looking at outputs what is described as "clipped sine". Can this drive the ...
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1answer
72 views

Why are shorter leads preferred over longer leads?

I'm building oscillator circuits on a copper plate for an RF design class using the dead-bug method. I know that short leads between components is preferred over long leads, but why is this? I heard ...
3
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1answer
81 views

How do I find spectral purity?

How is spectral purity measured? or evaluated? I have this signal coming from a 10 MHz crystal oscillator. I know how to calculate the SNR, but how do I calculate the spectral purity? Is it also a ...
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3answers
63 views

How does oscillator frequency stability affect timing? [duplicate]

If, for example, a crystal oscillator is specified as +/- 100ppm what does that mean? That the exact frequency is uncertain to that degree, or that the frequency varies by that degree over normal ...
3
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1answer
71 views

One crystal oscillator for multiple clock inputs PCB tracks topology

When sharing a crystal oscillator output to multiple clock inputs, what should the oscillator output PCB tracks topology be ? Should they go from the oscillator output to one clock input to the next ...