A device or circuit that generates an AC signal at a certain frequency.
0
votes
1answer
72 views
variable frequency generator using op-amp [on hold]
Hello, I'm trying to use the circuit above to obtain an output of ±10V, with variable frequency with a range of 100 Hz to 100 kHz. The output of the op-amps can swing between ±15V. Unfortunately, my ...
-4
votes
0answers
27 views
12 volt DC to 12 volt hf ac inverter [on hold]
I went to develope high frequency 12 volt ac with the help of crystal oscillator KD4. 000. So please suggest me hardware required and their connection. Please help me because I am new to electronics ...
1
vote
2answers
32 views
Best circuit to get an array of signals with the same frequency and edge-synchronizable to a reference but individually controllable duty-cycles?
I am looking to build a circuit to control five different FET drivers individually. The input signal would be a single shot from a function generator, which should produce five output signals, with ...
0
votes
2answers
37 views
Application of LC circuit(tank circuit)
I have read that tank circuit is used for radio tuning. When we tune a radio we change the variable capacitor, hence the value of LC changes. This would result in a change in the resonance frequency. ...
0
votes
0answers
50 views
high frequency and resonable high power oscillator needed [closed]
anyone know how to design a 110kHz oscillator with reasonable high power, which I can use as a transmitter for my wireless power transmission.
I want to have 5V 1A maximum power in the receiver.
how ...
0
votes
1answer
66 views
How to drive power MOSFET at 1 MHz
As part of a radio transmitter design, a square wave oscillator has to drive a power mosfet. Given the gate capacitance and the frequency, the maximum current should be around 50mA.
The power mosfet ...
0
votes
0answers
56 views
clock frequency too high
I have wired up the clock generator below.
However, when I attempt to measure the frequency with an oscilloscope, it is far too high and quite unstable. The measured frequency ranges from 12-50 ...
1
vote
1answer
55 views
555 VCO Circuit - Speaker to VCC?
Hello!
I have a simple question concerning this circuit I have built:
It is a 555 Voltage Controlled Oscillator I have built as a foundation for my signal generator circuit. The circuit works ...
0
votes
1answer
46 views
Can I use a Quarz Oszilator instead of a Standard quartz?
I want to complete this tutorial on burning a bootloader onto a atmega328. There a Standard quartz is used, but called a Quarz oszilator. Now I bought this Oszilator. Can I use the oszilator as well ...
0
votes
2answers
71 views
Need approval of transformer driver design
I designed a circuit from several ideas I saw before and I'm a bit too impatient to build the thing myself.
(http://imgur.com/KD97NuJ)
Basically, it's a two-transistor oscillator combined with an ...
0
votes
1answer
52 views
hse external oscilator on stm32f030
According to ST AN2867 Oscillator design guide for STM32, the oscillator circuit requires a Rext resistor
There are minimal boards with stm32f030f4p6 on ebay, aliexpress...
It looks that rext is ...
1
vote
1answer
92 views
Oscillator will not start up reliably
I have designed a PCB using a PIC18F6520 and a 32MHz crystal. Using a breadboard with a PIC16F877A, my code works great. But when I load a simple LED blinking program onto my PCB, the LED flickers ...
3
votes
2answers
70 views
LC Oscillator Circuit Analysis
I've found this schematic of a LC sine wave producing circuit online, and I was trying to figure out how it works (particuarly the feedback cycle).
Can someone tell me if this is right? I think I've ...
0
votes
1answer
79 views
Effect of Small and Large Signal Transconductance on the Colpitts Oscillator
I've been following Ron Quan's book: Build Your Own Transistor Radios and I've come to the section where Ron is analyzing the oscillator circuits used in his designs. In particular, he discusses the ...
1
vote
1answer
84 views
Long lived LED indicator
I want to have an extremely long-lived (at least one year) blinking LED with a single battery, like one 9V. Think like the battery indicator light in a smoke detector.
The LED doesn't matter to me. ...
3
votes
1answer
129 views
How does this oscillator work?
I am trying to understand the following oscillator from a Cyclone 40 transceiver (http://www.4sqrp.com/cyclone.php).
Here the the VFO (in the actual device, the inductor has a bolt through it to tune ...
3
votes
1answer
50 views
What kind of oscillator is used for CMOS CPU clocks?
Do they usually have a mono/bi-stable multivibrator that is activated a schmidt trigger when the computer is powered up? Or do they use ring oscillators? Or perhaps crystal oscillators.
0
votes
0answers
71 views
Colpitt's Oscillator: How do I set the output peak to peak voltage of the oscillations?
Good day, we are currently working on a VCO project that uses a transistor based Colpitt's Oscillator. We were asked to select a frequency of operation where we selected 89.1MHz as its center ...
5
votes
2answers
394 views
Using CMOS Schmitt trigger inverters in quartz crystal oscillator circuit
In all sources I've seen about quartz crystal oscillators using CMOS inverters there's a note like this:
But why Schmitt inverter is needed? Won't classic 74HC04 work?
2
votes
2answers
120 views
Common Emitter Colpitts oscillator
Good day, we were tasked to design a transistor based RF oscillator to be used as a VCO for our design experiment. In the picture shown below I have seen many tutorials on how to set the L1, C2, C3 ...
8
votes
1answer
265 views
Does this oscillator have a name?
I found this oscillator schematic and I hope to find more information about it.
0
votes
3answers
59 views
Where are the external oscillator pins on PIC12LF1572
I have searched the whole datasheet, but couldn't find where are the OSC1 and OSC2 pins are. I've found the CLKOUT (which is CMOS output) on RA4 and CLKIN (which is TTL input) on RA5. But I need the ...
3
votes
2answers
69 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
125 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
84 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
640 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
202 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
vote
1answer
102 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
82 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
votes
1answer
73 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
vote
2answers
103 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
votes
2answers
112 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
64 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 ...
5
votes
1answer
97 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 ...
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
113 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 ...
6
votes
1answer
123 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
107 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 ...
4
votes
1answer
103 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
56 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
44 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
81 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
89 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
votes
1answer
126 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
131 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
votes
1answer
60 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
votes
1answer
52 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
81 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
85 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
73 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 ...
