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

learn more… | top users | synonyms (1)

1
vote
0answers
41 views

how do i analyse my circuit for total impedance and phase shift?

i am new to circuit design and am trying to build an analog FM modulator -> demodulator in the UHF range. i have acquired components that claim to operate at 2.4 - 2.5GHz. basically im very confused ...
0
votes
2answers
61 views

Colpitts Oscillator- Extract Signal with emitter follower

I designed a circuit as shown in wikipedia:colpitts which runs at about 500kHz, L=680uH and C_1=C_2=100pF (+ some tuning caps in parallel to L). When looking at it with an oscilloscope it works just ...
3
votes
0answers
47 views

Can Two Or More ATTinys Share One External Crystal? [duplicate]

I've got two I2C Slave ATTiny85 chips both running at 16MHz with external crystals. Can they both share a single crystal with the 22pf caps? Is there anything wrong with this? I don't have any free ...
1
vote
2answers
48 views

Can I use electrolytic capacitor in a schmidt trigger oscillator

I want to build this cricket chirping circuit that I found on Happy Lab. The values are specified as follows ...
0
votes
2answers
49 views

Make an RF transmitter: classic transistor oscillator or VCO module?

This question is about pros and cons of making an RF transmitter (eg in the FM band) in the classical way (eg. with a "transistor based" oscillator circuit, like this one which is very classic and ...
6
votes
2answers
234 views

How to switch an AC signal on and off with a BJT?

I built a phase shift oscillator and now I want to turn the output of the oscillator on and off using a pulse, generated with the NE555 IC. I am trying to do this using a BJT. I connected the ...
0
votes
1answer
41 views

Can this colpitt get more efficient?

I am testing many solutions for wireless power transfer, among the solutions i am evalutating all of them (but one) are based on switching FETs (serie resonant halfbridge, class E, push pull..) so ...
0
votes
0answers
42 views

Making an oscillator for a boost converter

I want to make a boost converter to boos around 1.5 V to 5 V and i read that if the switch in the middle is switched on and off quickly, i can get a continuous increased voltage. simulate this ...
2
votes
0answers
68 views

increasing metal detector range

I am working on my senior project. As part of my project I need to use a metal detector. I am using the following circuit schematic. The principle is based on the properties of inductor coil: ...
-1
votes
2answers
55 views

Role of a resonator in oscillator

Is the resonator a frequency sensitive device or is it a signal source? I believe its the former but why does a transistor need a resonator to operate as an oscillator (A resonator is just selecting a ...
0
votes
0answers
25 views

Oscillator power

I have a HEMT oscillator and it is biased at a drain voltage of 1.5V and this DC voltage at drain is converted into AC because of negative resistance at the output.What value of output signal should ...
0
votes
1answer
56 views

Filter behaving as oscillator

I've built a state-variable filter, to this schematic: R6 and R7 are a dual gang potentiometer (with the 3rd terminal unconnected, so variable resistor), and R2 is a single gang potentiometer ...
0
votes
0answers
51 views

Can someone explain this Arduino theremin circuit to me?

I'm going to try building an Arduino theremin via the instructions here, but I'm a bit nervous because there's a lot I don't understand about the circuit. For reference, I have a degree in CS and am a ...
0
votes
3answers
85 views

How LC oscillators work with a continous DC power supply

I am having serious trouble understanding oscillators. I read a lot of articles and books but no one explained it simply and intuitively. From what I know, LC circuits oscillate for a small amount ...
-1
votes
1answer
77 views

Where does the oscillator frequency come from?

In case of a power amplifier I know the power comes from dc supply so it wouldn't be too strange to question where does the frequency in an oscillator comes from? This question actually came to my ...
0
votes
1answer
42 views

How to use mikroC oscillator frequency in my code?

I am using mikroC pro for PIC. In the "Edit Project" window there is an option for setting oscillator frequency. I want to use that value in my code. I think it can be used like something that is ...
1
vote
1answer
50 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 ...
2
votes
1answer
43 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 ...
1
vote
1answer
92 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 ...
0
votes
2answers
45 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 ...
1
vote
2answers
115 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 ...
1
vote
2answers
107 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. ...
1
vote
1answer
65 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 ...
1
vote
1answer
69 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?
24
votes
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 ...
0
votes
1answer
49 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 ...
0
votes
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 ...
0
votes
1answer
35 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 ...
1
vote
1answer
58 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) = ...
0
votes
0answers
43 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 ...
0
votes
1answer
283 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 ...
0
votes
2answers
44 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 ...
1
vote
3answers
257 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 ...
0
votes
2answers
104 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 ...
0
votes
3answers
78 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 ...
0
votes
1answer
98 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 ?
1
vote
3answers
115 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 ...
-1
votes
3answers
116 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 ...
1
vote
1answer
55 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 ...
0
votes
1answer
113 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 ...
1
vote
1answer
76 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 ...
0
votes
2answers
48 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 ...
-2
votes
3answers
108 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, ...
3
votes
2answers
289 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 ...
1
vote
1answer
167 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 ...
0
votes
1answer
46 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 / ...
0
votes
1answer
120 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. ...
0
votes
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, ...
0
votes
2answers
65 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 ...
0
votes
1answer
97 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 ...