oscillator

I'm trying to make a VCO from this schematic but I can't get it to work. My oscilloscope broke so I can't use it but when I plug in my headphones I only hear a slight DC voltage. (The circuit runs on a single supply)

Hi, Maybe this is a silly question but I didn't find the answer on the forum... I simulate an oscilator with LTSpice. The FFT simulation gives me a curve, but I would like to know if I can get a clear table with the resonance frequency, the noise... without guessing with cursor position on the...

Hello everyone, I’m building my first microwave oscillator and I’m trying to enforce the reflection-coefficient condition—namely, that the product of the two reflection coefficients has a real part greater than 1 and a zero imaginary part. To achieve this, I generated a negative resistance...

Could someone suggest a theoretical approach to designing a Colpitts oscillator for microwave frequency applications?

I have this circuit where I will use as a DCO called common source Colpitts Oscillator the problem is i try to connect two capacitors in parallel to the C1 capacitors then put a switch in between them something like this. where if the switch is on then it turns into parallel then it varies...

Hi, I'm trying to make an simple oscillator with cd40105 chip and 9v battery. I'm using a 0.1uf capacitor and one 10k ohm resister, but It doesn't make any sound. I tried with the 100k ohm, but still doesn't work. When I turned on the battery, It first sounded like a lower beep, but very few...

HI! I am new to electronics .planning to do fm bug for college project can someone explain this circuit in detail

I made this oscillator and the output voltage is 1V, and I need another amplifier to go to 5V and some mv ideally to 10mV, but that is harder. I made this but it doesn't work very well and I don't understand why. I can't work with OpAmps, with only transistors. I put a common emitter with a...

Hi, I need to create a square wave oscillator with variable frequency upto 200 MHz and (optionally) variable duty cycle. I've got several components for this: a comparator AD8611, an operational amplifiers AD8009 and AD8055. I tried mutiple circuits, but it didn't help. Could someone please...

I'm working on a project for school where we must generate a square and triangle wave from fixed supplies in a lab using only RC components as well as a specific list of active components: We are also NOT allowed to use variable capacitors or ganged potentiometers. The circuit must have...

Hello, I have to design a single op amp circuit that has only +15v, -15v and GND as input and outputs a symmetrical PWM signal (+V and -V) with adjustable frequency and duty cycle. I have something that works partly but not completely, I can adjust the duty cycle from ±60% to ±100% but af that...

Hi everyone, I'm new in this forum and this is my first post. I'm a software developer but electronics has always been one of my favourite hobbies. I don't have experience in RF circuit design, and for this reason I'm here trying to find someone that can help me in this project. I'll try to be...

Hi All, like many the Oscillator died in my Huntron 1005B. as you know they are no where to be found. I came across the old kit schematic and figured I would try and build one. My 1st problem was IC1 and IC2 as they are not identified in the original schematic. I was told by some members to try...

Hi, I found an oscillator circuit and there are two parts not identified. IC1 and IC2. The symbol looks to be Zener diodes but There is no value .Would anyone have an idea what they could be? Please see The schematic ,bottom left corner Best regards to all, Stay safe.

I know that total impedance is Zp/(Zp+Zs) where Zp is parallel impedance and Zs is series impedance that can be calculated easily. Is total current equal to Vin/total impedance?

This is my running circuit and its waveform. I have met the requirements set by my instructor in which Vrms=2.5 and is operating at <100Hz. My only problem is now making a sinusoidal waveform. I have tried a bunch of things like removing the C2 capacitor and adjusting some of the values but...

Hi, I need the simplest circuit to run 250 crystal oscillators at once. The circuit must give a sharp pulse to all the crystals at 1Hz. The idea is the get them all "ring" and resonate with each other. They are regular 32khz cylinder oscillators used in watches. Any ideas?

I decided to design a Colpitts oscillator with an output frequency of 1,2 MHz followed by a buffer stage. No other specs for the moment. I would prefer to keep unchanged the coil (I got it salvaged from old radio gear) and the transistors while using a +9V PSU. Once having it working I would...

Hi everyone, I am a newbie in electronic field. Now I am trying to design a circuit to drive QCM (Quartz crystal microbalance). In some literature I have seen some comparator-based designs like this: In fact, some similar designs can also be found in the datasheets of high-speed comparators...

hello, I need to generate 2 signals: a square wave of a pretty low frequency, say 10hz. Right now I'm using a 555 timer to generate the square wave. I also need another square wave 90 degrees out of phase. How can I do this? I've attached a picture of the signals I need. Thank you in advance.