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 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


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


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


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


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


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


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 


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


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


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



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


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


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


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 



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


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


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


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


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


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


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


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


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


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 


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


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


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


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


can laser be used as a frequency source for a photodiode which can act as a transmitter/oscillator? Answered

Photodiode induce current when a light of paricular wavelenth/frequency  strikes on them..laser have a high frequency and low wavelenth......instead of light but electromagnetic waves,can it act as a source of frequency on photodiode hence making a oscillator????

Question by arihant   |  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


my RTL memory circuit is an oscillator? please help! Answered

Today I soldered together a "D-latch" one bit memory circuit comprised entirely of resistors and transistors. If someone asks me about the schematic, I'll post it. The weird thing about my RTL (resistor transistor logic) memory circuit is that it also works as an oscillator that short circuits my power supply. There is also a slight delay between when i try to set my D-latch's memory state, and when it actually happens.  I have an educated guess that the delay in state change is caused by whatever bizarre mistake caused the oscillation within the circuit. does anyone know of any resistor transistor timer circuits on the web? that may help quite a bit. (lol. EPIC memory pun) the picture above is my device. the oscillation is around 1.2 Hertz. it occurs when the D (data) input of my memory circuit is high. as you can see, this is really confounding me. please help with a comment!

Question by jensenr30   |  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


Why is my oscillator circuit providing electricity only when electricity is removed?

So I built an oscillator using JFET transistor J310, an audio transformer 1:100 ratio, and this lights up a 3 volt led at 1.5 volts to even .3 Volts!!  But the problem is that, it lights up the led for a second only when the battery is removed. Is there a way to fix it? I really like how the circuit can use power from small power sources, only if I can get it to work while the battery is connected. It would be great if you could help me fix this circuit!     

Question by argha halder   |  last reply


Is it possible to change a remote controller's signal frequency by switching out the crystal oscillator? Answered

        I have several old remote controllers for vehicles and I need to switch the frequency from 49MHz to 75 MHz. I think that I should be able just to switch out the crystal oscillator and replace it with a 75 MHz crystal. Does anyone have any suggestions on if this will work or not?                                                                                                                                                                                                                  Thanks!

Question by transistorguy   |  last reply


how to calculate this FM Oscillators ?is the ceramic capacitor (beside 2nd transistor) in series ? ?

I can calculate it is by http://electronics-diy.com/calculators.php but, is the 4.7pf take effect with the frequency ? how frequency is it, if i change the trimmer capacitor with 20pf (i don't have the trimmer capacitor) ? please help me : )

Question by Rendydevara   |  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


Reciprocating motion? Answered

Dear All I would like to imitate for to build a bar go up and down in angle 90 degrees  at website:   - http://www.alivola.it/00-CLOHE-EN-oscillating-lever-1.htm   ( oscillating lever 1 : animation ) So please help me to know  how  calculator  to find point C  ( CRANK 15mm) for the rod go up and down in angle 90 degrees .Many thank you                                                      Best regards                                                            lam

Question by lam   |  last reply


Microcontroller help!

So I'm working on a project to build a binary clock style watch, though I have very limited experience and knowledge about circuitry and microcontrollers. As of right now I have found a relatively simple project on this site I wish to replicate and downsize to fit in the size of a watch. The design of the circuit is based off the layout in this project:https://www.instructables.com/id/Simple-Binary-Clo...Now I have read up on microcontrollers and microprocessors. I also read some stuff about oscillators and how they can work to essentially synchronize the internal clocks of microcontrollers making them more accurate for clock uses. First is this true that a crystal oscillator can improve the accuracy of a microcontroller? And if so, how could I add a 16.000 Mhz crystal oscillator to the circuit presented above? (I want to use a 16.000 Mhz oscillator because the code written for the microcontroller is based on the 16 Mhz internal clock, so this should line up fine)Thanks if you can answer these questions!

Topic by Tman179 


I have 2 rough-running, four-point, orbital, oscillating buffers that need to run smooth again.

These are heavy duty, 2-handled, 2 Amp, 3240 rpm, four-point, orbital, oscillators that were converted to professional massagers. Both of them now run really rough and I can't keep buying new ones nor can I afford to ship them back to the company for refurbishing. I assume they only need lubrication, but I can't figure out how to open them up nor does there appear to be any one around here who repairs power tools. (Rock and a hard place, eh?) Can anyone help? I have a photo, although those two black knobs do not exist on my units.

Question by NYCtherapist   |  last reply


what is the inductance of a coil which is 3mm in diam having 5 turns? Answered

I'm testing FM transmitter using multisim software.I don't know the value of the inductor to be used in the oscillator ( the oscill. has a variable cap.).I got this ckt. from a site, it is mentioned that the coil should be about 3mm in diameter and 5 turns. The wire is tinned copper wire, 0.61 mm in diameter.Since I'm testing it using multisim so i need a specific value.anyone knows it PLZ... let me know........THANKS.....

Question by manpreet singh   |  last reply


in order to make ir rays travel longer distances from an ir led which circuit is appropriate

Either a multivibrator or an oscillator circuit input which will be to an ir led

Question by sandiri   |  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


How to create linear motion from non-sinusoidal angular rotation? Answered

Sorry, I coudln't think of an intelligent way of snap-shotting my question. Here's the deal, I have this lab test tube rocker, which oscillates the platform back and forth like a see-saw. It works just like a piston engine, with an electric motor that has something like a crank, and something like a connecting rod, such that it converts angular motion to linear. You probably know what I'm talking about, but I've attached a photo. Because it oscillates on a sine wave the platform spends an equal amount of time at every phase of the wave. But I want it to spend more time at each end of the oscillation, the peak and the trough, more like a sigmoidal curve. What do you think would be the best (easiest) way to do this? Mechanical or electrical? Mechanical seems cumbersome. Have the pin on the crank "float" (so that it has a variable radius) and then have it follow an elliptical (or sigmoid) track? Or have the crank be toothed gear that turns a track that could be shaped over an elliptical or sigmoidal shape, and have the pin come off the track? That seems unnecessarily complex. The easier option (I think), would be to create a timer/switch so that every 180 degrees of rotation, at the ends of the oscillation, the timer turns the motor off for a second. But I have no idea how to do that.

Question by marozie   |  last reply


Vdc to Vac

Hi there hope someone will have some info....anyway what I'm after is a schematic or similar for an inverter 13.8Vdc to 2000Vac with a variable square wave oscillator so i can adjust the frequency possibly incorporating a 555 will be @ 50% duty

Topic by Narnies   |  last reply