Hi,
I was playing around with the NE555 (commercial piece) and while testing the output signal out of pin three I noticed that my signal was distorted as you can see in the below/or attached image. Kindly, any thoughts why this happens?

https://imgur.com/a/QNrZ7

 

hi n,
Could you please post a circuit so that we can check it out.?
E

 

hi n,
Could you please post a circuit so that we can check it out.?
E

Thanks ericgibbs, the below circuit is a circuit that I found online and gave me the distorted waveform.

 

hi ,
Sorry about delay in getting back to you.
Do you have the component values for that circuit, so that I can check the calculations.
E

 

Resistors are all 1k, and capasitors are 0.1uf.
Thanks!

hi ,
Sorry about delay in getting back to you.
Do you have the component values for that circuit, so that I can check the calculations.
E

 

The "apparent" distortion of the signal could result from many reasons.
The first thing to do is disconnect any connections to pin-3 of the 555-timer.

Now, check the following:

1) What kind of oscilloscope probe are you using? For best performance you ought to be using a x10 probe. Make sure that the probe is properly adjusted for frequency compensation. If you do not know how to do this, then ask.

2) Make sure that you use the grounding clip that is attached on the end of the probe. Again, ask if you are uncertain.

3) Make sure that the scope input is set for DC input.

4) Put a 10μF-100μF electrolytic capacitor across the power rails (pin-8 and pin-1).

 

hi j,
Using only 1k's and 100nF, I cannot get that circuit to run.
Do you have a web link to circuit source.?
E

 

hi j,
Using only 1k's and 100nF, I cannot get that circuit to run.
Do you have a web link to circuit source.?
E

Hi ericgibbs,

Here is the link:

 

The "apparent" distortion of the signal could result from many reasons.
The first thing to do is disconnect any connections to pin-3 of the 555-timer.

Now, check the following:

1) What kind of oscilloscope probe are you using? For best performance you ought to be using a x10 probe. Make sure that the probe is properly adjusted for frequency compensation. If you do not know how to do this, then ask.

2) Make sure that you use the grounding clip that is attached on the end of the probe. Again, ask if you are uncertain.

3) Make sure that the scope input is set for DC input.

4) Put a 10μF-100μF electrolytic capacitor across the power rails (pin-8 and pin-1).

Thanks MrChips, I will go through your instructions within the next 30 minutes and will let you know about results right after.

 

Where is the 330 ohm resistor?
And the 10 uf cap?

 

Where is the 330 ohm resistor?
And the 10 uf cap?

The 330 Ω supposed to be used for the LED at the output at pin 3.

 

Where is the 330 ohm resistor?
And the 10 uf cap?

I apologize to forget about the 330Ω R, I was driving when you were asking about the components values. Sorry!

 

Did the video show a scope of output?

One usually doesn't care about distortion for a indicator light.

 

Did the video show a scope of output?

One usually doesn't care about distortion for a indicator light.

Thats a good note, actually am getting the distortion while connecting the audio buzzer (3-24V). Does it matter what is your load, BR-549?

 

A little bit. There are tons of information on almost any function in the universe, about/with 555 timers online. There are 555 experts here too. You need to explain exactly what you want to do.

 

A little bit. There are tons of information on almost any function in the universe, about/with 555 timers online. There are 555 experts here too. You need to explain exactly what you want to do.

Actually, I put the circuit together and it works perfectly, then am thinking now, since I have a Good working circuit then my output signal should look Good too without distortion!!! that's all the story!

 

The buzzer probably needs a different signal than the light does. The audio buzzer has what they call specifications. These specs tell you what the buzzer needs to work.
The 555 has specs too...called a data sheet. This tells you what you can put in and what you can get out of the device.

This is why all the details are important. It's more complicated than building blocks.

 

hi n,
You did post that all the resistors are 1k and the cap 0.1uF.
No wonder the circuit I tried did not work, its important you give your helpers the correct information, else they are wasting their time.

E

 

hi n,
You did post that all the resistors are 1k and the cap 0.1uF.
No wonder the circuit I tried did not work, its important you give your helpers the correct information, else they are wasting their time.

E

Again am sorry, YET still the circuit should work even based on the information that I provided earlier!!!

 

The "apparent" distortion of the signal could result from many reasons.
The first thing to do is disconnect any connections to pin-3 of the 555-timer.

Now, check the following:

1) What kind of oscilloscope probe are you using? For best performance you ought to be using a x10 probe. Make sure that the probe is properly adjusted for frequency compensation. If you do not know how to do this, then ask.

2) Make sure that you use the grounding clip that is attached on the end of the probe. Again, ask if you are uncertain.

3) Make sure that the scope input is set for DC input.

4) Put a 10μF-100μF electrolytic capacitor across the power rails (pin-8 and pin-1).

Hi MrChips,

Sorry for the delay, I am using the Rigol DS1052E that I just purchased last week, new one. I did set the probe to X10. Also, I tried a couple different capacitors and still nothing changed.