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

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2
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2answers
50 views

Atmega8 - Max output frequency seems to be devide by 4

I'm a little bit confuse, and hope that someone here can point me out what I'm missing... I'm using an Atmega8-16PU, Flashed the fuse with : ...
0
votes
2answers
79 views

Setting up Internal Oscillator with PIC16F1829

I just started working with PIC microcontrollers and I am currently using MPLAB X IDE with a PIC KIT 3. I've been trying to get a simple LED blink code to run on a PIC16F1829 using the internal ...
3
votes
1answer
79 views

Does thhis crystal circuit works?

I need a tiny oscillator circuit for testing an application. Now I haven't much experience in creating oscillators so I would like to use this Collpits-circuit: I only need the carrier wave so I ...
4
votes
5answers
581 views

Is this phase shift oscillator design correct?

I found this design on the internet. It's a 180 degree phase shift oscillator. Actually, it is a 203 degree phase shift oscillator. Because the frequency is 6.5 kHz and the capacitive impedance is ...
3
votes
3answers
99 views

How to overcome transistor heat in slayer exciter?

I build this circuit and it works but I have two problems. The major problem is that the transistor becomes very hot quickly. I burnt my transistor due to excessive heat. How can I get rid of the very ...
1
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1answer
63 views

Need Help In Creating and Debugging a 8Mhz CLK Circuit

I want to create a CLK generator circuit that will work at 8Mhz. I'm following this design (from http://www.electronics-tutorials.ws/oscillator/crystal.html): My crystal is 8Mhz HC49/US, with 20pF ...
0
votes
1answer
27 views

tunable Wave form generator design with op-amps Multisim

I need to simulate a waveform generator using Multisim. I used the design in this Link. the frequency is 1KHz. It works fine but I need some modifications: 1. I need the peak to peak voltage(Vpp) to ...
0
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1answer
66 views

Splitting AC voltage based on phase

Is it possible to separate the positive and negative portions of an AC voltage wave into two separate lines, where one line has the positive voltage portion (and is neutral when the source is ...
1
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2answers
59 views

Royer Oscillator

Hello everyone and thanks for your time reading this. I recently switch my oscillator circuit over to a digital based version. With this topology I can monitor source currents on each RF MOSFETs ...
0
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2answers
97 views

What are the differences between function generator and oscillator? (Specific design)

I design the attached circuit: 75 MHz Sine wave that connected to R and C in parallel: In the output, the amplitude of the sine wave is changing according to the C, more capacitance smaller ...
0
votes
1answer
60 views

Testing voltage continuity using a beeper?

I have a 48v rail and i wish to plug it into an audible oscillator to check for continuity when i am rattling the system under duress. What is the simplest circuit that i can plug into 48v to hear the ...
3
votes
0answers
45 views

Using crystal in LTspice (where to get values for RCL)?

I'd like to simulate a schematic in LTspice driven by a crystal. An capacitor representing the crytal (as a resonant circuit) however it needs some specific values. Is there a table of common values ...
-1
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1answer
46 views

Switching mechnism

I am designing a power supply which has two output port. Only one should be selected at any time and given power (depend on if any one is connected to a load). I intend to use a current sense at the ...
0
votes
1answer
40 views

How to connect current circuit?

First of all, sorry for trivial question. While googling came across the current circuit, but I'm puzzled how to connect this circuits: There is 4.5V out put where to connect this, and the whole ...
3
votes
0answers
76 views

pic32 maximum external frequency while running from internal 8MHz RC oscillator

I am completely new to PICs and I have never worked with a part as complex as this. In particular, I'm wondering if it is possible to generate a reference clock (REFCLKO in the datasheet) at 11.2896 ...
0
votes
0answers
31 views

Amount of AC produced in high frequency oscillator/ Slayer Exciter?

Can someone please tell the formula /function for calculating the no. Of oscillations and the amount of AC produced in the circuit This circuit is inspired by Tesla coil
5
votes
1answer
105 views

JFET - Ceramic Resonator - Oscillator Phenomonom going in and out of oscillation

An oscillator using a ceramic resonator is going in and out of oscillation. I have an oscillator circuit with a peculiar phenomonon. The oscillator does work (mostly). The “crystal” I am ...
2
votes
1answer
80 views

How to build 200 Khz oscillator using Wien bridge?

I've the following circuit for generating sine wave. As I'm supposed to make sine wave within 1 kHZ - 200 kHz, I chose wein bridge oscillator circuit. However, I'm not able to increase the ...
0
votes
0answers
30 views

How to reach this frequency while simulating this Colpitts oscillator?

I have designed the circuit with the values that are given in (figur1) and it works fine , the frequency is similar to the theoretical value.. However, the question is to redesign the circuit ...
4
votes
1answer
94 views

Transistor Based Wien Bridge Oscillator

I've been studying the schematic for this RLC Bridge from Heathkit (IB-5281). The full pdf can be found here (search for the part number): http://www.vintage-radio.info/heathkit. The circuit ...
0
votes
4answers
53 views

Barkhausen condition on a Wien oscillator

Consider the Wien oscillator: We can determinate the operational amplifier gain defined as: $$A(s)=\frac{\bar{V_o}}{\bar{V_a}}$$ and the gain from the feedback network: ...
2
votes
1answer
35 views

Questions about FM Mic Kit Schematic

I'm currently building an FM Microphone kit and I'd like to understand its operation before physically putting it together. The documentation only provides an overview of some aspects and provides no ...
0
votes
2answers
76 views

10 USB Hub ICs from 1 Crystal Oscillator?

I am designing a PCB with 10 individual USB hub ICs onboard. They all require a clock input and I am wondering if it is possible to drive all the clocks from a single crystal oscillator? The hub IC ...
3
votes
2answers
62 views

Additional Resistor For Pierce Oscillator

I want to build SIM Card Reader by following a schematic from here as follow: I realized that the clock generator (upper center) form a Pierce oscillator but with an additional resistor (R2 symbol ...
0
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0answers
26 views

Colpitts dimensioning for high leakage sensitivity

I've got the following problem: having a coil with inductance L=22uH with equivalent series resistance R, how would you design this Colpitts oscillator in order to make its oscillation amplitude ...
0
votes
1answer
107 views

How a Joule thief works?

I think this website explains a Joule thief in a wrong way: http://buju357.blogspot.com.eg/2013/06/joule-thief-theory-of-opperation.html The website says: "The increasing collector currentflowing ...
0
votes
3answers
120 views

Sine wave generator not working?

Can't get sine wave out of this circuit in Proteus. Can you help me, please? I'm suppose to have sine wave generator with range 1 kHz - 200 kHz. While googling came ...
0
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1answer
58 views

problem : find the coefficients of linear system used to build a digital oscillator ..?

Please can one explain to me I having difficulty on how to start Thank you all *** can anyone correct me if anything is wrong !
0
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1answer
49 views

Inverter using Wien Oscillator

Here is Wien Oscillator circuit: Amplitude of oscillations, Vout, is about 10V. If I put step up transformer on output with appropriate primary/secondary ratio, I can get 220V AC voltage, and it ...
2
votes
1answer
59 views

What is going on in this VCXO circuit?

Here's a schematic of the VCXO oscillator section from a Siemens S55 mobile phone. AFC signal coming from the processor tunes the crystal via a varicap. There's also a thermistor going back to the ...
3
votes
1answer
80 views

Wien bridge sinusoidal oscillator

simulate this circuit – Schematic created using CircuitLab I would check that in the Wien bridge sinusoidal oscillator the gain A_V=1+(R5+R4)/R3) is actually A_V=3 as the Barkhausen ...
0
votes
2answers
70 views

Will this short range AM transmitter constructed using crystal work? [closed]

I have designed a circuit as follows: simulate this circuit – Schematic created using CircuitLab There are a few corrections in the circuit. I couldn't do it in the editor because I ...
0
votes
1answer
45 views

how to detect the changes in capacitor?

I have capacitor in the picofarad range , that capacitor will change slightly ±5 picofarad ,how can i detect that change ..any circuit or idea the capacitor is not normal capacitor, i used two ...
0
votes
0answers
45 views

How to set oscillator fuse settings for PIC32

I have PIC32MX795F512L MCU and I am doing a I2C program in it. I am using MplabIDEv8.92. During debugging, PicKit3 gives an error: ...
0
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2answers
48 views

Feedback resistance condition (Rf > 29R) in Phase-shift oscillators

In an equal resistance , equal capacitance CR phase-shift oscillator, the feedback resistor has to be slightly larger than 29*R When I am attempting to simulate the circuit at 29*R, there's ...
3
votes
2answers
287 views

Does a carrier wave need to be sinusoidal?

I am trying to AM modulate a song and I have an idea of how I am going to do it, but I need a carrier wave to start with and I've been having trouble creating one with a ceramic resonator because I ...
0
votes
1answer
60 views

Wien oscillator with amplitude stabilization

Here is Wien oscillator with amplitude stabilization: I know how this oscillator works in theory, but I'm interested how it would behave in practice. Voltage at Vout node would be sine wave. If we ...
0
votes
1answer
51 views

Fm reciever local VFO sa615

I'm building a FM receiver based on a SA615. But when I test the VFO (variable frequency oscillator) with a spectrum analyzer and a sniffer probe I don't see any frequency showing up. So the ...
0
votes
1answer
68 views

Multivibrator max frequency

It is a basic Multivibrator circuit that I am testing. The problem is that I can only get about 160khz with the left circuit; using smaller cap or larger resistor will give me 0hz. Second problem is ...
0
votes
1answer
47 views

RC oscillator and active bandpass Opamp filter

Here is my task: Here is solution: Although solution is there, I'm stuck. Firstly, how did they find transfer function? How did they treat diodes?
0
votes
1answer
49 views

Oscillator circuit - Opamp

Oscillator circuit is shown. a) Calculate frequency of oscillations, b) Calculate minimum value R1 for which circuit still oscillates, c) Calculate amplitude of voltage VB, for which voltage VA ...
2
votes
3answers
330 views

What is the role of capacitor C3?

Here you can see the schematic of an LC oscillator. When I change the value of C3 it changes whether I have oscillations or not. For example if C3=10u there are not stable oscillations, and if ...
0
votes
3answers
140 views

Opamp filter - oscillator

Here is my task: How to solve this? I'm confused because of only one input in opamp. Edit: Here is solution: But I'm still confused why is there only one input to opamp
2
votes
1answer
62 views

Is the Garmin GPS 12 on board 16.368 MHz oscillator GPS controlled?

My plan is to use my old Garmin GPS 12 as a frequency standard. As it has no pps (pulse per second) output I am thinking about using the on board oscillator as the clock source. So my question: Is the ...
2
votes
1answer
60 views

Oscillating Amplifier

I am attempting to build the following amplifier The amps used are MAR-8A+'s from minicircuits C1, C2, C3, L1 - while these are available on the board they have not been placed The filters are epcos ...
0
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0answers
49 views

Adding Multiple Signals to a DC line

Basically, I want to add multiple sine wave signals to a DC line one by one. Details - 24V DC line powers the Oscillator circuit.Its output is to be added back to the power line as shown. The output ...
0
votes
0answers
83 views

Opamp oscillator with amplitude stabilization

It is known R4=R5=1.2k. My task is to calculate amplitude of oscillations at v0: Opamp and diodes are ideal. I did analysis of circuit without amplitude stabilization and I got oscillation ...
0
votes
0answers
26 views

direct feedback from drain to source oscillator

I am reading about one transistor LC tank oscillator. Here is a picture of that circuit: The tutorial file says "direct feedback from drain to source". I don't see why. It seems to me that there is ...
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3answers
91 views

Can you switch between 2 tank circuits using a relay?

Say I have an oscillator that needs to span between 1 GHz and 1 Mhz. Ill be controlling it with a microcontroller, probably an arduino. According to this, ...
1
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2answers
107 views

Opamp oscillator

Here is my task: In oscillator circuit ideal opamps are used, it is known R=10K, C=10nF. a) Calculate frequency of oscillations, b) If Vcc=Vee=15V, calculate amplitude of voltages in points A, B ...