# Phase shift

Discussion in 'General Electronics Discussion' started by Ricperes, Jul 20, 2015.

1. ### Ricperes

29
0
Jul 20, 2015
Hello, I want to make a phase shift but I am not able, I put Vin as one sinudoidal wave, Freq = 50Hz and Amp = 10 V and Vout as having the same wave but offset 120 degrees. So how i can do it? thank you

2. ### Arouse1973Adam

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Dec 18, 2013
Which way do you want the phase shift lead or lag?
Adam

3. ### Ricperes

29
0
Jul 20, 2015
hello, i just want receive a wave and generate another wave with 120 degrres offset and same amplitude. how? i don't now...

4. ### Arouse1973Adam

5,164
1,087
Dec 18, 2013
Yes but do you want the new wave to be in front or behind the input? Google lead and lag phase shift for examples of what I mean.
Adam

5. ### Ricperes

29
0
Jul 20, 2015
I want the new wave to be in front th input +120º degrees. Can post a exemple please?

6. ### Arouse1973Adam

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Dec 18, 2013
Here you go. Waveform 120 degrees apart.
Thanks
Adam

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7. ### Ricperes

29
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Jul 20, 2015
its exacty this what i want. How i can do it with a circuit?

8. ### Arouse1973Adam

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Dec 18, 2013
Give me a moment
Adam

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9. ### Martaine2005

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May 12, 2015
You have to CLICK on LIKE....
He will then post it for you..

10. ### Martaine2005

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May 12, 2015
Lol, and post a £20 note too.

29
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Jul 20, 2015
lol

12. ### Arouse1973Adam

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Dec 18, 2013
Thank-you. Here is a simple way to do it. It would be best to make R1, R2 and R4 variable. You may get quite a bit of variation over temperature so choose good quality capacitors and resistors.
Adam

13. ### Ricperes

29
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Jul 20, 2015
Thank you very much , i will test this and after i report!

14. ### Martaine2005

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May 12, 2015
Uh Hah
You forgot to like!!!!
And please subscribe too

15. ### Arouse1973Adam

5,164
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Dec 18, 2013
Remember this is an example, you would be able to use other op-amps, depends what you have lying around. Linear op-amp can be quite expensive.
Adam

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16. ### Ricperes

29
0
Jul 20, 2015
I have test this circuit, and it's ok! Just another question please, you can give me or say where are the equations to scale the circuit? Like C ou R!

Thank you again

17. ### Arouse1973Adam

5,164
1,087
Dec 18, 2013
Phi = tan^-1(XC/R) or Phi = 360*fo*dt. But this will only get you close, you will have to adjust the resistor values to get it right. When I did the calculations the circuit didn't produce the desired phase shift so I had to manually change them to get it right, you will need to adjust the values yourself.
Adam

18. ### Ricperes

29
0
Jul 20, 2015
Yes, i understant. I made a test, that is I want to offster another wave 240ºdegrees or -120º degrees, so i use as Vin the Vout of this circuit and it's ok!

19. ### Arouse1973Adam

5,164
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Dec 18, 2013
The circuit I gave you is for 120º. You can add more RC and buffer stages for greater phase difference.
Adam

Ricperes likes this.
20. ### Ricperes

29
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Jul 20, 2015
I can substitute LT1006 by which opamp? for exemple?

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