Tagged Questions

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

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-1
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1answer
38 views

analysis square waves oscillator: how do I calculate the values?

Which are the Vc (V+) and V-, I's and Vout values in these circuits? The node i's and the Vc and Ic?
0
votes
1answer
29 views

Error: Model in Pspice is undefined

When I simulate the circuit below in Pspice, the output info says: model J2n5485 used by Q2N5485 is undefined. But I have defined the model in the code. I need to ...
0
votes
2answers
70 views

Why does the tank circuit of Coplitts oscillator produce 180 phase shift?

http://www.circuitstoday.com/colpitts-oscillator I would like to understand how Coplitts oscillator works. This link says that the tank circuit of Coplitts oscillator produces 180 degrees phase ...
2
votes
1answer
77 views

PIC18 not working when wiring 30pf capacitors of cristal resonator to ground

I'm using pic18 with external oscillator 16MHZ 16M HZ HC-49S Crystal Oscillator with two 30PF capacitors configuration OSC = HS using breadboard, when wiring the ...
1
vote
2answers
123 views

Need help understanding simple oscillator circuit

I know this seems like a really basic question, but bear with me. The following circuit diagram is given by one of my old electronics kits: simulate this circuit – Schematic created using ...
0
votes
1answer
86 views

Transistor amplifier circuit for triangular wave

I've made triangular wave oscilator as shown in Fig. 1 and it works perfectly at frequancy 10 kHz with peak voltage +3 Volt to -3 Volt. I intend to generate SPWM. But when I feed this circuit to ...
1
vote
1answer
75 views

Value for feedback resistor in pierce crystal oscillator configuration

This question is partially an "understanding english" question and partially and "understanding the pierce oscillator configuration" question. Backstory I'm currently looking at using a Freescale ...
-1
votes
1answer
93 views

How to design a 500 khz sine wave generator? [closed]

I need to design a 500 khz sine wave generator. Could anyone help?
0
votes
1answer
57 views

How could this GPIO-controlled LED status blinker be improved?

I'm building a simple circuit to drive an LED status indicator in a project built around a RPi. The circuit takes its power from the same source as the RPi and is connected to one of the RPi GPIO ...
-1
votes
2answers
60 views

can LC tank circuit alone produce oscillations? [closed]

Circuit below is the hartely oscillator circuit, I simulated it in multisim to know how exactly oscillations occurs, while doing so I just seperated tank circuit (from tansistor base and collector ...
1
vote
0answers
67 views

Oscilllator model in multisim

What's wrong with this schematic? Multisim doesn't generate oscillation. Also I changed R3=1000, R3=500 but all the same.
1
vote
1answer
67 views

Why does this circuit oscillate and produce sound?

I've connected an 8-ohm speaker in series with coil. When I apply 5 volts / 500 mA to the combination (coil and speaker), I heard a very high frequency sound (something like whistling). The coil is ...
0
votes
0answers
25 views

Can I replace crystal input with mems oscillator

I am designing a device that uses a real time clock (RTC) from ABRACON. AB1805-T3. RTC Datasheet: http://www.mouser.com/ds/2/3/AB18XX-30381.pdf The device has the option to either select an internal ...
3
votes
1answer
107 views

PIC16F628A Blinking LED

I was setting up a PIC16F628A for a simple Hello World program (blinking LED) and somewhere in the process, I have failed. The LED stays lit at the specified pin and does not "blink". I am using the ...
0
votes
1answer
49 views

CMOS vs LVDS oscillator

I am trying to select a 160MHz clock oscillator for my FPGA. The least expensive I found was either LVDS or LVPECL type for this frequency. I used a CMOS type before, so the output of the oscillator ...
0
votes
2answers
165 views

Use 555 for additional 40KHz PWM in Arduino

I need to transmit infra red signals using IR LED from my Arduino device. The IR signals consist of PWM 40 kHz periods and "silence" periods of various length (typical IR remote signals). I know ...
0
votes
0answers
42 views

Why Inverter with feedback oscillates ? [duplicate]

Phase difference between input and output for this circuit is 180 degree. That means Barkhausen criteria is not satisfied,still circuit generates a oscillating signal. Why ?
0
votes
2answers
60 views

Question about CMOS Inverter Oscillator

Using CMOS inverter with crystal and cpacitors, we can make a oscillator. And i find many docs mention the method 'negative resistance'. But, they are not all the same. The method from TI's doc: Use ...
0
votes
0answers
49 views

How can I use the OSC2 pin as normal IO on a pic32mx150f128b?

Everything else works well, the CPU runs at 40 MHz, UART works, GPIO works; the OSC1 pin works as GPIO as well. But I cannot use OSC2 as GPIO. I am using the Fast RC oscillator with divide-by-N and ...
0
votes
0answers
36 views

Fixed Frequency Synthesis with PLL

I'd like to design a downconverter with a fixed local oscillator frequency ~2GHz with fairly good stability. I understand that the best way to do this is a PLL with a fixed crystal oscillator and a ...
0
votes
0answers
42 views

Feed Raspberry Pi camera module with external clock signal

I want to frame synchronize multiple Raspberry Pi camera modules - I guess I can do this by feeding all the modules with a single external clock signal. The thing is being discussed in this post. The ...
0
votes
3answers
52 views

Working of RC Phase shift Oscillator?

Figure show a RC phase shift oscillator using Op-Amp with gain 5(Vo/Vi). My assumption : Circuit is generating a sine wave with a peak to peak voltage of 10v. Consider positive maximum point (+5V) ...
-1
votes
2answers
124 views

Problem in wien bridge oscillator

I have put up a circuit for Wien bridge oscillator using 741 op amp, with R= 390 ohm and C = 2.2nF, for operation around 200 khz ( gain is 4). However, it did not work so I switched the resistor in ...
0
votes
1answer
55 views

LC comparator based oscillator

I am trying to build a LC oscillator based on LM393 open-collector comparator, but am having some difficulties. This is the current circuit: I was expecting to get a nice square wave with one ...
0
votes
0answers
65 views

Would my project be affected by lack of a filter?

I have chosen to do a final project, I will be transmitting bits using a wien bridge oscilator, I want a 160 MHZ sine wave and I have chosen values for it. I have chosen the AD8041 op amp because it ...
-1
votes
1answer
109 views

How can i send bits using a wien bridge oscilator?

so i have a string of bits that my shift register will be outputting one after another, i wanna use a wien bridge to send them into air. if a bit is a "1", i want the wien bridge to send a wave, and ...
2
votes
1answer
78 views

Understanding the Pierce Oscillator Pi Network

I've been looking at the Pierce oscillator and I think I understand how it operates, but I'm a little unsure of the role played by the series caps to ground (the so-called pi network). I've put ...
0
votes
1answer
37 views

How to connect muRata XRCGB_F_M Series (XRCGB27M120F3M00R0) to microprocessor oscillator

This device as described in the data sheet (Crystal Unit (Crystal Resonator)) shows four pad pins (labeled 1-4) in an arrangement similar to ceramic resonator units. However, as shown in the diagram ...
1
vote
1answer
132 views

I want to make an oscillator with 160 MHz

I want this for my project. So I have decided to make a basic Wien bridge oscillator. $$f = \frac{1}{2\pi R C}$$ So if I choose a capacitor of 0.1 nano farads and a resistor of 10 ohms, I should ...
1
vote
1answer
95 views

Help with a RF reciever circuit

Recently I have been working on a basic RF receiver, but my efforts so far have proved fruitless. I designed the following circuit based of of previous research into the topic. According to what I ...
1
vote
1answer
60 views

Problem in Clapp oscillator

I've set up this circuit on breadboard ( C1 being electrolytic and others disk) with Q1 as 2n3904. The simulation is perfectly fine and the oscillator works in the simulator as expected. However, ...
1
vote
2answers
96 views

What are quartz crystal oscillators?

I'm a beginner in electronics and I found two quartz crystal oscillators, each one has two pins. Their numbers are: sjc4.000a ee4.000 Is it possible to know the ...
2
votes
1answer
105 views

How to configure PIC24F oscillator?

I'm coding on PIC24F and I'm still fighting with oscillator configuration. Between configuration bits and SFRs such as CLKDIV and OSCCON I am a 'bit' lost... I've been making things work by trial and ...
0
votes
2answers
116 views

How to make an easy oscillator?

I want to make a very simple oscillator that produces the sound of telephone ringing (I want to make a ringer). I will not connect it to a telephone so the quality of the sound is not important. I ...
2
votes
3answers
78 views

Crystal or Crystal Oscillator for time sensitive device

A device that I'm working on is controlled by ATmega328P microcontroller. This will be some sort of a watch, therefore I want it to be as precise as possible. For instance if left to run for a whole ...
0
votes
1answer
27 views

Input / output voltage standards for modular analogue synthesizer

I'm investigating building a modular analogue synthesizer, and learning electronics along the way. I want to get a firm understanding of the supply voltage, inputs and outputs specification that is ...
1
vote
1answer
98 views

Crystal clock oscillator giving out sine wave, help?

I am building a 50MHz clock by using ABRACON ACOL-50-EK crystal clock oscillator. I have connected 3.3V supply (with a 0.1uF capacitor to ground) to Vdd (pin 14). GND (pin 7) is grounded and output is ...
1
vote
3answers
138 views

External oscillator problem

I have this sample program to blink LED with PIC18F4550 using external oscillator. I'm using a 20.000 MHz crystal oscillator with 30pF capacitors. The problem is when I wire the capacitors the the ...
0
votes
0answers
43 views

Crystal Oscillator output voltages and power

I have built the crystal oscillator stage to the Pixie 2, a Hartley oscillator, with a 9 volt voltage source. I measured the output with my VOM set to AC 30 volts. It read almost 30 volts. That is ...
7
votes
2answers
277 views

Common Emitter not amplifying

I am trying to make a 27 MHz carrier wave transmitter from a crystal oscillator and a secondary amplifier. Thi is the complete circuit: simulate this circuit – Schematic created using ...
-2
votes
2answers
86 views

Simplest possible oscillator (with some constraints) [closed]

I'm interested in finding an oscillator circuit that meets the following constraints: Runs on 9 volts or less Periodicity 100-1000 Hz or so Non-sinusoidal oscillation No inductors 1 transistor or ...
1
vote
1answer
36 views

Analyzing/designing positive feedback amplifier

I've been searching all around to find a tutorial on analyzing/designing a positive feedback amplifier, especially a single transistor in common collector mode, but with no luck... So, lets say I ...
1
vote
1answer
51 views

Colpitts VCO by varying base voltage

I've noticed that if I build a Colpitts oscillator (audio range) using a transistor in the common base configuration (similar to the circuit here) I can vary the voltage on the base and get a wide ...
5
votes
2answers
227 views

What type of oscillator is this? (Theremin Project. Variable Pitch / LC Oscillator)

I found this oscillator at a Theremin project pdf. I simulated the circuit, and found that the output (left wire) oscillates at 236.5 kHz. This circuit is referred to as "Variable Pitch ...
-1
votes
1answer
53 views

Wien Bridge Frequency Selective Network Frequency Response Proof Exam Question

So this is part of the solution to the proof of what the frequency response on the frequency select section of the Wien Bridge oscillator. What I don't understand is how the answer are equal to ...
3
votes
4answers
417 views

Why don't infinitely many sinusoidals exist in an oscillator circuit?

A sinusoidal oscillator, takes the ambient thermal noise or any imbalance in the circuit as input and gives out an oscillation. This kind of oscillators are called to be linear. By the nature of a ...
0
votes
2answers
72 views

Keeping output of a phase shift oscillator in-phase with another sinusoidal signal

I have a sine wave source and a phase shift oscillator which gives out sine wave. The sine wave source is not always enabled. It may be turned of in arbitrarily time periods. I want the phase shift ...
8
votes
1answer
417 views

Why doesn't my opamp relaxation oscillator oscillate?

I have designed a relaxation oscillator with an opamp. It is supposed to oscillated at 50Hz, but it doesn't. I haven't built a physical circuit, I'm trying to simulate it in CircuitLab. I calculated ...
0
votes
1answer
99 views

How to tune a radio receiver using a crystal oscillator?

I'm building my first radio receiver (a simple Ramsey HR-40 kit). The "Alignment" section of the instructions requires that I have some other device which I tune my receiver to. Since I have no such ...
1
vote
3answers
161 views

Getting the right frequency from an oscillator circuit

I have constructed an oscillator circuit using the resistor and capacitor values shown in the diagram above (from the Proteus ISIS simulator). I run the circuit and use a switch to trigger the ...