Oscillator with AND and NOT gates? Answered

Hi, I've been recently working with logic gates and that's when this struck me.If an AND gate and an inverter are hooked up as per the attached schematic, can point A function as an oscillator?Assume that the gate inputs float high. If so 1)What would be the frequencies of the oscillations if the gates used are a)CMOS b)TTL ? 2)Would the frequency change with the input voltage ? 3)Is this implemented elsewhere? Thank you for reading my question.

Question by Adarsh_tronix   |  last reply


555 oscillator?

How can I make a simple variable oscillator out of a 555 timer, loudspeaker, capacitors, transistor, potentiometer, and resistors? (and anything else I may need). I would ideally like it to go from about 10Hz-20KHz.

Topic by andy70707   |  last reply


Oscillator Help

Hello, I was wandering if you guys would like to help me out with a quite simple little project. I am looking at making a simple oscillator that could be pumped through a normal musical instrument amplifier. I'm not looking at using any IC's (555, PIC etc...), simply some resisitors and capacitors connected to a audio output and a Rheostat. So my question is this. An oscillator (in terms of electronics) is simply a electronic current that goes from one very high frequency to a very low one, right? So could a just use a fairly big capacitor and a very big resistor and would it be listenable through a speaker?

Topic by dipseydoodle   |  last reply


How oscillators work?

Why oscillators like wien bridge oscillator or RC phase shift oscillator gives only sinusoidal waves instead of triangle waves or square waves of particular frequency. Please dont explain about multi-vibrators . Also please say how to differentiate between low frequency oscillator and high frequency oscillator. By using any value of R(resistance) and C(capacitance) i will be able to get any frequency(high or low) by substituting in respective formula. But what makes one to judge a oscillator as high frequency or low frequency.

Question by deepakmurali   |  last reply


Hartley or Colpitts oscillator

I need Hartley oscillator or Colpitts oscillator. I tried a lot but failed. I am simulating circuits on multisim but not been able to get sine wave. Can anybody help me with that?? I am using these oscillators because I want high power oscillator in high frequency range.

Topic by m_uamir72001   |  last reply


Oscillator Trouble/Math ?

I have a "step-up" transformer from a DVD player that I really want to experiment with, but I know I need some form of alternating current to use it. I just finished taking a 3-week summer camp at which I learned about electronics, and there I encountered the 555 circuit. It's simple to build; I can just connect all the pieces on a small breadboard, considering I have several 555 chips. But what makes me a little miffed is that anything over 6V could burn out the chip's components. So I gave up on the 555 oscillator, and turned to the simple(-er) LC circuit. I want to have around 60 Hz to simulate the mains frequency, but I have no idea what capacitance or inductance I should use. Furthermore, I don't quite understand how to achieve a specific inductance based on coil turns, coil diameter, coil length, etc. If anybody could clear me up on these concepts, I'd greatly appreciate it.

Question by Umniscient 


Repairing a oscillating fan

Help repairing a fan. Does anyone know how to fix a oscillating fan? it has some power, as in it will start a little when i turn it on, but then stops. Help, please.

Topic by erin b   |  last reply



I need help setting up a 2Mhz oscillator circuit

So here's the backstory : Last night I was poking around in our shed looking for ..... when I came across a box of old electronics. Inside was a lot of old parts, from about the 1970's, a few 555's and 741's and a big 28 pin chip I didn't recognize. After plugging the numbers on the chip into google (AY-3-8500) I found out that it was freaking pong on a chip. Apparently my dad had bought it as a kit in the 70's but never got around to make it.So I took a look around the net for schematics and foundhttp://www.electronixandmore.com/project/pongman/http://www.datasheetarchive.com/pdf-datasheets/DataBooks/Book241-59.pdfHere's the problem, I don't have easy access to the 90uH inductor in the schematics or a 2Mhz crystal.So how can I create the 2Mhz I need to run the chip? It's the only thing between me and pong X(

Topic by greendude   |  last reply


How to make a single frequency am radio receiver?

I know how to make a 1 mhz am radio transmitter, so now I want to make a 1 mhz radio receiver to receive audio. I would prefer to not have to wind any coils and just make solid state with few components. Do I need to have a coil to receive the radio waves? Also can someone link me to an explanation or explain how I can demodulate with a 1 mhz crystal oscillator. I don't want a link to 'how to make an am radio' I can do that myself. I just want to know A. how to receive the radio signals hopefully without a coil (only using a variable cap?) and B. How I can demodulate using a crystal oscillator. Can I somehow receive the signal using an oscillator like was done with a 555 timer here https://www.instructables.com/id/555-timer-radio/ Links to schematics / pictures of schematics must appreciated? Thank you

Question by sk8aseth   |  last reply


Measuring oscillation of a multi tool

I have a harbor freight oscillating multitool that is advertised as oscillating between 10k and 20k oscillations per minute. In reality to speed control goes from 0 opm to an unknown value. I’m trying to set the tool to oscillate at 35 Hz. What is the best way to measure the frequency of the tool and set it to 35 Hz?

Topic by rednax718   |  last reply



What are capacitors for in oscillator circuit for pic?

I've been learning to program pic18f1320 with led blinker program and using 10Mhz oscillator. I don't have right capacitors but circuit works without them just fine... 

Question by bratan   |  last reply


inverter circuit

I have several BD139 transistors, several types of transformers, blocker diodes and 40pf 50v capacitors. can anyone show me a simple schematic to convert low voltage to high voltage?

Topic by buddybro   |  last reply


Uploading something made using an instructable as a guide? Answered

Basically, I am currently working on a project using an instructable as a guide. I'd like to share what I've got afterwards, but I'm not sure if the "Photos"-submit-function is supposed to be originals only, or not.

Question by Skelpolu   |  last reply


Is it possible to replace a 40Mhz crystal with a 49.860Mhz?

I bought a RC submarine that was running at 40Mhz. Submarine broke, seller shipped a replacement, but replacement could not be remotely controlled by original remote. In fact, while looking under the submarine, there was a sticker written "49Mhz - 3". I guess it is referring to Channel 3 - 49.860Mhz.  So could I buy a 49.860 crystal, remove the 40Mhz crystal from remote controller, and get my submarine to run again? Is there anything else to consider???

Question by donstereo   |  last reply


Waveform Generator

Hi guys! So actually i wanted to make a circuit that can turn on and off an LED array at a particular rate (say 10 seconds time period). I want the LEDs to gradually brighten and dim. At first i thought i can implement it using a multi vibrator, but it it turning off and on too fast, since the output of the MV is a square wave. I want to design a simple circuit that can generate more slowly rising waveform (like sine or triangular) and can also drive a load of at least 100 mA and have a time period of 10 seconds or so. Any suggestions? 

Topic by charmquark   |  last reply


How can I make a simple oscillator to power a transformer? Answered

For the longest time, I've wanted to screw around with high voltage stuff but I didn't know how to make an oscillator. So can someone help me with this?

Question by Shagglepuff   |  last reply


Help with making a triangle wave sequencer with pitch relative to tempo, please? Answered

I'd like to make a low frequency triangle wave oscillator/sequencer, but the oscillator and sequencer have to somehow be synchronized with each other, so that if the tempo gets doubled, for example, the pitch also goes up one octave. How can I do this? I've already made a circuit based on this oscillator and the 4017 decade counter as a sequencer. (Ignore all capacitor, resistor and pot values; I haven't defined them yet)

Question by aelias36   |  last reply


7MHz transmitter for ham radio? Answered

I'm fairly new to ham radio but I saw this and thought maybe I could use a 7MHz oscillator and a large antenna to use as a ham radio transmitter. Is this possible? If not, what could I do/use on the cheap as a ham radio transmitter/transceiver? Thanks, fusorx

Question by fusorx   |  last reply


Quantum superposition, big enough to see!

In today's Nature online, there's a report of an experimental group who have put a naked-eye visible oscillator (an aluminum-nitride paddle about 30 microns wide) into a quantum superposition of moving and not moving simultaneously.  They cooled the paddle to a few tens of millikelvins, and connected it to a superconducting circuit that could drive the paddle to osciilate.  After confirming that the paddle was in its quantum ground state (no vibrational energy), they put the superconducting circuit into a superposition of on- and off states, and directly measured that the paddle was in the corresponding superposition of vibrating and not vibrating. In the words of J.B.S. Haldane, "Life is not only queerer than we imagine, it is queerer than we can imagine." Update #1:  Science News also has a report on this result, with some slightly different details.  The paper itself is a pay-per-view Nature article. Update #2:  Science magazine now also has a report on this result, with a better and more detailed explanation of the superconducting phase circuit.

Topic by kelseymh   |  last reply


is ther any device that has an oscillator?

I cant get an oscillator in the shops

Question by dcpatel94   |  last reply


How to make an oscilating relay circut? Answered

Can anybody tell me in detail, how you would go about making a relay oscilate? Please explain and give directions.

Question by tesla man   |  last reply


Simple transistor oscillator required - suggestions? Answered

I'm after a simple transistor-based oscillator for the basis of a 1-octave organ. I want to use recycled bits, which I have a lot of, and I reckon someone knows what's good as opposed to going looking for something. Crude, basic, simple, nothing sophisticated. L

Question by lemonie   |  last reply


cardboard music through mechanic oscillation ?

Hi everyone, i'm planning to build a big cardboard instrument. if you look at the attached .png you will find a very simple drawing of what i have in mind. i have some experience in programming dc motors with an arduino, but im not that well learned in physically building things. the motor should be fairly strong, the cardboard size will range from 2 meters to half a meter. any tips in the right direction are welcome! greetings, Rogier

Topic by rjupijn   |  last reply


Wein-Bridge Oscillator help needed

I've been searching google for about an hour now, and I need help with making a Wein-Bridge Oscillator. What I need help on:- Can I use any op-amp? I want to just go buy one at radioshack (don't feel like paying 7 bucks for a tiny IC online)- What kind of incandescent bulb should I use/is there a more modern substitute?solved by killerjackalope- Is there a way of controlling the frequency with only 1 potentiometer (I found this website but I still have the same questions as above and I don't know if it'll apply).-how much power does it consume assuming there's only a light load on the output?

Topic by guyfrom7up   |  last reply


How does a spindle sander oscillate? Answered

I'm wanting to cobble together a spindle sander using the guts of a hand drill. Mounting it is pretty trivial, but it would be very cool if I could make it oscillate vertically as well. Unfortunately, I don't have a spindle sander to take apart so I can see how it operates. Can anyone tell me what mechanism moves the spindle up and down? Does it use the same motor that rotates the spindle, or is there a secondary actuator involved?

Question by yoyology   |  last reply


crystal oscillator TCXO VCXO OCXO

Guangzhou zgc electronic co.ltdZGC Electroric co.,ltd. is an incustrial entity that is involved in developing and manufacturing quartz crystal resonator of various models and specifications.tel:86-20-32068136fax:86-20-32068201ZGC Electronic CO.,LtdZGC Electronic CO.,Ltd

Topic by zhenggong 


4017 low frequency Digital clock generator / Oscillator Answered

Hi to all! I need to "feed" a digital clock pulses to a CD4017 decade counter. It should be possibly with only 1 active component and very, VERY few passives components around. It should give 1 to 30 pulse/second rate. FIxed frequency oscillator. It needs to be simplest, for the space constraints I have. Do anybody knows if it is possible? ;-) 

Question by mario59   |  last reply


Controlling a servo with a Micro-controller?

So I decided to spend some time to make a "gimbal" in a very loose sense. Basically I was experimenting using a square wave oscillator to generate the correct PWM to have a servo rotate between 0 and 180 degrees when a tilt sensor is tripped. After some research multiple sites said having a 1ms pulse every 20ms would have it move to the 0 degree position. Great so I will make a oscillator pulses ~1ms on one side and 19ms on the other. However this does not seem to be working. I am curious if it is a fault in my math or if the tolerance on the parts I am using are just too wide to be any good. Here is a diagram of my set-up with the values a came up with. One spot that may be weak is that I just notice someone somewhere mentioned using 50Hz for the timing I just used that number when I calc my figures. Any feedback?  Also a side note is that I have been able to move the servo in one direction only and by accident ( in fact it's what inspired this project) when C1 & C2 were 2.2nF and the R1 & R2 were 10k potentiometers that I turned until something happened. Now that I am trying on purpose no results. 

Question by Jayccob   |  last reply


stepper motor question

Ok, i am trying to make a chain clock, its just a clock with a gear instead of a minute hand that turns a chain with 12 numbers on it. my problem  is; the chain i am using is too heavy for a conventional quarts movement. i would like to use a stepper motor but all the drive circuits i find need an arduino. are there any simple circuits i can make, to use a stepper motor for a clock? i do have some circuitry skills so i can work around some stuff. thanks for the help :)

Topic by golddigger1559   |  last reply


turn cable connections into wireless internet

Hey everybodyi just got this idea of making a wireless internet using ADSL (from cable form to wireless). There should be some cat5 cable connections. There are 8 pins in a cable, 4 of them are used: 1 pair for transmit (+ and -) and another for receive (+ ad -). I haven't experiment with this yet, but by connecting a crystal to the adsl, like transmitting music using AM radio, and connect a receiver, like most cd players that have abilities to receive am radio (perhaps solder the 2 wires from the speaker), this probably should work? Connect the same things to the computer, like the images below shown. So 2 crystals and 2 radio receivers are needed. Also, there should be 2 different frequencies, one for transmit and another for receive.Hope this would work. Any thoughts and comments are very welcome =]

Topic by J50Nunlimited   |  last reply


Design for a 25 MHz oscillator/inverter that can operate at 110 volts.?

Can anyone help me find a design for or creating a design for a 25 MHz oscillator/inverter... I also could use a design for or a compact inverter that can have the same voltage rating but bring the frequency of a dc current to 60 Hz.

Question by amelius   |  last reply


Simple radio transmitter question Answered

I am interested in building a small low powered radio transmitter. Searching the Instructables website I found some Instructables that have some with oscillators: Build a very simple AM Transmitter Make Your Own Low-Power AM Radio Transmitter Some other projects are built with timer chips and transistors: 555 AM Transmitter Easy AM Transmitter! Would someone please explain the theory or science, and advantages or disadvantages of the components involved when building each project? Thank you very much.

Question by blkhawk   |  last reply


Variable frequency generator? Answered

I'm looking for a way to build a simple frequency generator that generates high and low frequencies. I was thinking of using a POT to control the frequency range. I looked for it all around but the search didn't help much.

Question by matokage   |  last reply


in seconds as worth a mhs?

I really wanted to know to use a 555 timer instead of a crystal oscillator 16 mhs

Question by ualbuquerque   |  last reply


Schematic-reading problems ( Square wave oscillator )? Answered

Well, I try to follow an instructable for quiet a while now, but I still couldn't understand its schematic .. its not that I don't know what the symboles mean, but I dont understand the connections - Those arent physical-connections, but still ... The instructable: www.instructables.com/id/Build-a-Square-Wave-Oscillator-Part-1-of-DIY-Mod/ The Schematic: https://www.instructables.com/files/orig/FG9/MG8C/GFRWMNFA/FG9MG8CGFRWMNFA.png It's all over the place! There are 10k resistors appearently and 1 more resistor ( I can see 3x 1m resistors ), but he didnt mentioned those in the instructable. I'd contact the instructable-author, but he's a student and has thus no time at all. If somebody has time to explain this to me, or yet better, just mentioning the connections in english, I'd appreciate it very much. This is driving me insane. ._.

Question by Skelpolu   |  last reply


Op Amp Distorion oscillates when on high distortion?

I'm making an op amp distortion pedal, but as I turn up the gain, its starts squealing just when the crunchiness starts sounding good! Is there any way I can stop the oscillation?

Question by 8bit   |  last reply


I want to replace or alter the crystal oscillator on my UNO as part of a electronics suicide workshop

I want to replace or alter the crystal oscillator on my UNO as part of a electronics suicide workshop, look at it as circuit bending i guess. I want to know approximately what could happen- is it going to run a simple standalone program, I think serial and flashing will not be possible  post-lobotomy but i can load the program before i bend it. The processing speed will be the same but any Millis() or clock functions will be way out? Will it just trip over its own feet and crash? I have heard interesting things about using your finger over the solder spots to make it run at 60Hz etc...Anyway i will experiment but i wanted to get some predictions from people who know this stuff at a more fundamental level! Cheers!!

Question by oliverkellow   |  last reply


If I hook up a webcam to a walky talky (two way radio) or a wireless router could it be used as a wireless camera?

If I hook up a webcam to the microphone part of walky talky and attach a screen to the speaker part of the other one will it send video like an rc cam? Also if i hook webcam up to a wireless router could i watch it on my computer?Anothe idea of mine is athe bottom could you tell me if it would work

Question by woken   |  last reply


can we make a radio receiver using a cystal oscillator ?

Making radio using capacitor and inductor takes a lot.....can we try  make a radio receiver using a crystal oscillator??

Question by arihant   |  last reply


How to get an ATtiny to run an accurate clock? Answered

I'm making a clock with an ATtiny and I would like to know how to make it tell accurate time. I'm already pretty sure it would require an external crystal or resonator, but I just don't know the frequency or if there are any code requirements. I'll be programming the chip with an Arduino, if that helps with code. Thanks!

Question by GenAap   |  last reply


Where can i get an oscillator for cheap or salvage?

Anything that would work for this instructable:https://www.instructables.com/id/Radio-Jammer/?ALLSTEPS

Question by XOIIO   |  last reply


Laser beam oscillating from low to high power?

Hello, i have a green laser pointer, that i love to use. I put new batteries in it, but the beam was oscillating, mean when i pressed the switch and holding it, the dot was high-low-low-high etc.. and now its not tuning on!! when i watch trough the hole, while pressing the button, a tiny red square is in the centre of it, but no green beam. what could it be?

Question by dsirotic   |  last reply


how to design a crystal oscillator for a particular frequency using quartz crystal

Can anyone please provide a link which speaks about this...for a beginner  thank you in advance

Question by sandiri   |  last reply


how the crystal connected across the collector and base of a bjt pierce oscillator provide 180degree phase shift?

A normal oscillator will provide 360degree phase shift. of this 180degree is by the transistor amplifier and the remaining 180 is by the feedback circuit or tank circuit. but in the case of a pierce crystal oscillator ,it is the crystal which connected across the collector(output) and base provides 180degree phase shift the crystal provide 180degree phase ?

Question by mishal.abe 


Help! Building an optical pickup for a bass guitar.

I am building a bass guitar and would love to have an optical pickup on it. I am a experienced with building circuits but i need help. This is what i know so far. There will be an ir led on one side of the string and a photo diode on the other. This will cast a shadow on the photo diode to make an analog signal. One led and one sensor for each individual string. Then I am lost, all I know is that it has to go though an oscillator of some sort to produce the sound. If anyone could give me a good schematic that would  be great.

Question by kyrisroy   |  last reply


Arduino ADC & Decoupling capacitors.

Hello, I have a sample Analogue to Digital Converter from Microchip.  (MCP3901). Now I want to use this ADC together with an Arduino (Uno) on a breadboard  in order to connect it to my laptop.  This works all very smoothly and all by all I am fairly happy with the result up till now. But, there is a small problem.  There is a small oscillation in the data when measuring over something with a large resistance (first 3 graphs).  The oscillation is absent (or greatly diminished) over things with small resistance. (last 2 graphs). I have only a basic knowledge about electronics and cannot get rid of (or even diminish) the oscillation. My guess is that I don't get the decoupling capacitors right. These are the symptoms: Voltage measured across the solar panel of a calculator during ~2s  (while lifting my hand). Look at the oscillation in the data . (the oscillation is about 50Hz ) And zoomed in: Secondly, in the case of a 100 kOhm potentiometer in series with a 2.2 MOhm          (There is no Omega in the special characters list?) I can see that the oscillation is scaled with the measured voltage. This means that the oscillation is probably internal.  (My guess is that the source is from the power lines which are probably not decoupled very good. And the oscillation manifests itself in the internal reference voltage) So, this goes from 0 to ≃0.2 V  (because it is a 100kOhm in series with 2.2 MOhm between 5V and ground.) increased in small steps (small turns on the potentiometer) Green = without decoupling Caps. Red = with decoupling caps (0.1µC ceramic in series with 47µf electrolytic, but it's pretty much the same with all caps.) (the oscillations here are more sinusoidal than the ones with the solar cell) And finally, there is no problem when measuring over something with a low internal resistance. Look at this graph of a (bad) potentiometer or about 100 Ohm.  And look at the near absence of noise and oscillations in the data. I can't immediately see why the ADC gives such clear data in this case. But this is definitely what I want. And a detail; Has anyone some Ideas on how to kill that oscillation? (I don't mean with fourier transforms and such)  If the decoupling capacitors are the problem, I have a limited choice in themc can you please say which ones I should search for? Thank you very much.  

Topic by Sparticles   |  last reply


Why my quadcopter is oscillating and crashing after taking off?

Hi guys, I am new to this multirotor domain. We are strugling with our first F450 quad. Below are the specs: 1. F450 quadcopter chassis 2. KK2.1 Flight controller. 3. FLYSKY CT6B --- 6 channel radio transmitter 4. 1400 KV Brushless motor 5. 30 amps ESC 6. Lipo battery Firstly the quad was not taking off properly. More over, after activating self level mode also, the quad is not at all stable. If we max up the throttle, then it flips in one side and crashes. Otherwise, it takes off from the ground upto 1-2 feet if we slowly increase the throttle and then oscillates and to avoid crash, we then decrease the throttle. Please see the video HERE for more reference. Please guys, really need your help in this matter. We are not able to understand exactly what is wrong with our quad. We have already calibrated our ESC's and the Accelarometer but no luck. Please help guys.

Question by RohitR66   |  last reply


NPN BJT strange behavior? Answered

My linear power supply design has been using a PNP MJE2955 pass transistor wired to a 2N4401 as a complementary darlington configuration, but this was not an inherently stable design, and would oscillate when adding output smoothing capacitors, particularly MLCC types (with very low ESR). So I decided to try the far more common darlington arrangement, although I am not fond of the higher voltage drop. However the output was oscillating at approximately 3KHz with 1uF output capacitance, with NO input to darlington. I removed the 2N4401 so all I had left was just a 2N3055 transistor with the emitter connected to the output and the collector connected to a 20V supply. The output was ringing like crazy. The oscillation frequency could be changed by adding/removing output capacitance. Why is this happening? How should I go about stopping this oscillation? I originally had a 4.7k resistive load on the output but it did not significantly affect the output oscillation.

Question by -max-   |  last reply