This was the single best explained solution to a problem i had in electronics i had for a while. Short, concise, and working. I am astounded and i thank you very much.
I used to make these simple phase shifters over 20 years ago. The author's o-scope shows the output signal level staying constant, which is not possible with the circuit shown, so I believe the o-scope signals are in actuality taken from a phase shifter constructed of op-amps. As one can see in the schematic, the reactance of the capacitor and the resistance of the resistor are in series across two signals 180 degrees out of phase. When the reactance and resistance are equal, a null point is reached where the signal is minimum. Not zero, because there is always a phase difference between the current in the resistance and that in the reactance of the capacitor. So, in reality, the output signal level will vary as you move through the resistance range - peak voltage decreasing to a (not quite) null point and then back to peak voltage of the opposite phase. This effect is lessened to a great extent with a higher resistance load on the circuit, but can never quite be eliminated (again, when using the circuit shown). The multi-megohm impedance of his 'scope is definitely helping here. Op amps are used in most production phase shifters because the inherent balancing nature of the differential input of the op amp coupled with it's high gain can be used to automatically correct for the above-mentioned null effect. Also, the high impedance inputs of today's op-amps reduce the loading on the previous stage. There are several videos here on You tube related to design of op-amp based phase shifters. One more point: the simple circuit shown here can never quite attain 180 degrees of phase shift. That is because while you can have zero resistance for one end of the phase range, you cannot (practically speaking) have infinite resistance for the other end of the range, which would allow for the full 180 degrees. The input impedance of the following stage has an effect as well. The result is that there will always be a small amount of phase shift remaining at that end of the range. You can get close, 178 degrees or more, and with op-amps you can get even closer, so close it is not worth worrying about.
Useful simple circuit. The simplicity and elegance as well as the hand drawn schematic on graph paper reminds me of Forrest Mims engineers mini notebook circuits.
Yes .. I grew up following guys like Don Lancaster and Forrest Mims. I collected all his mini notebooks he wrote for Radio Shack. Hats off to all those guys who made electronics interesting and easier to learn.
This is great! I've been looking for a simple circuit. I thought I'd have to go AC to DAC back shift, then through MOSFET to AC. I'd like to have two signals that automatically end up being 180 degrees phase shift from each other.
Best one....dude... I just thought of it...and searched for it on RUclips and after searching for a few minutes...boom ..I got your video.... That was really helpful 🤗 You are doing a great job!!!
Thank you. I will attempt to use this as part of a circuit I'm going to be building to control a 2 phase induction motor that needs a 120 degree offset. It normally uses a capacitor but the capacitor only works for certain frequency ranges and does very little at low frequencies.
This is great! I actually made one with what I had, a BC547, 1K resistors 10 nF and 22uF capacitors. It turned out fine. Now excuse my ignorance: it does not reach 180deg, only about 160deg. Is there any way of making it shift 180 deg?
It is technically impossible for this circuit to reach full 180 degrees phase shift, because that would mean you have zero resistance for one end of the potentiometer range, and infinite resistance for the other end. You can however get pretty close by increasing the resistance as much as possible on the high resistance end. Maybe you can get to 175 degrees but that's just guessing.
well my project is phase shifting the gm 4 pin ignition module I ques that thing runs around 33-333 hz in stages I ques so how do I determine what values shuld I use for the rc network? Wuld It by posibel to use darlington transistor alone with out the limitations that the ignition module offers ? I have terribel cold start problems in winter coil saturation is terribel I need amplifier ignition and that deam module simpli does not work at lowr engine rpms I think it was marked around 700rpm I do lot engine conversions like hot bulb or hit and miss engines so I kinde of surche for circuet that can control well the pick up coil signal or kinde of if posibel to phase shift it from 0 to 360 ° by demand . So hoppe some one has some advice about that topic . Any way I manuali control my engine any way by mechanical levers and programabel jetts so tehnicali speaking I was wondering culd I simpli use some power darlington transistor with out that shiti 4 pin gm ignition module? Again that thing is terribel .I culd not finde exact data for my pick up coil volts and frequency ratings some peopel say it makes around 3 volts minimum suposedly that shuld by enough to trigger the ignition module and the module it self has stages of operation like(start,run ,stall mode)depending on the actual voltage aplied to the input pins of course also depending on the frequency range it operates . So Im literali confused how to deal with that thing I hoppe some one finde the time and checks the 4 pin ignition module circuet diagram who uses the mc 3334 ic chip from motorola . I honestli dont know how to apply calculation for rc network for that thing .
Great video thank you so much! I'm a physicist so my electronics skills are really lacking but this video is a godsend for what I need to accomplish. Quick question, you mentioned I would need to change the components depending on the frequency band I was using. How would I calculate the values of components I would require?
@@0033mer Ok thank you! I need an easy controllable way to control the phase for a set of signals I'm sending to an electromagnetic coil. This set up is beyond ideal for me, especially if I incorporate digital potentiometers. I had one more question while thinking about how I was going to implement this. How would using a different voltage range effect this set up, if I wanted to use a AC signal at +/- 140V how would I need to change the circuit? Thanks again for taking the time to reply to my first question and making the video in the first place
Yes, that's the great part about it. Its make sense and give us newbies creative freedom. It's basically a comparitor. Plus and minus voltage and output the remainder
I don't see a reduction in amplitude of output with respect to input on the emitter side due to the BE diode drop. Is that because the collector output is helping to cancel that effect?
It has a bug. It uses voltage divider biasing which is sensitive to biasing resistors and power supply ripples. I found an opamp circuit which gives much stable output.
hi 0033mer: i have a sine wave signal which is 50Hz. i wanted to make a phase shift for it and i did your circuit but it didnt work. only i got 145 degrees of shifting phase and also unfortunately i cant change the freq of phase . may it cause by capacitor which i used at very left and very right on your scheme.there are two polered capacitor and i used polered electrolytic capacitor with 10uF, 25V ranges. do you have any advise for me??
The component values used in the schematic will not work with a frequency that low. Change the values of the 5k pot and .022 cap (RC circuit) to make it respond to 50 Hz.
@@0033mer thanks a lot for quick respons :) i made it with 1mohm pot and 0.01uf capacitor. i can change phase about 130 degrees now,and its ok for me. but there is an another problem. when i prob the output of the phase shifter , there are 2-3dB noise happining. do you have any advice of me for that situation ??
This is simply stunning and I love this project. But forgive my ignorance, is it theoretically possible to adjust the phase of 500khz or even 10ghz sound waves by adjusting the resistance value?
I want to shift my microphone's signal phase.Can ı use this circuit as a micpreamplifier and also as a phase shifter by changing the gain of the transistor?
I built this circuit, and it does not work as stated. It is not unity gain. It changes in amplitude as you adjust the potentiometer. It does phase shift though.
As stated in this video this circuit is frequency dependent. At the intended frequency (around 1-5kHz) it has unity gain throughout the range of phase shift. At high frequency it attenuates quite a lot as you shift it.
Thanks for the vid. Very helpful content. How would you go about making such a device to handle 20-25 amps at 120V? For example: I'd like to run a single(split) phase oven, but only available source is 3 phase. Could a device be created to split the 120V leg 180 degrees and still be able to handle the high load? Seeking a simple circuit rather than a massive split phase transformer, of course...
The circuit is for small signals only and a redesign for heavy AC loads would be a big undertaking. If your 3 phase power is 208 volts you can run your 120 volt circuits from one phase to neutral and your main 208 volt heater elements from phase to phase. I am doing that with a proffer.
@@0033mer Thanks for the response. Wouldn't it require 180deg phase shift on the connected phases to be balanced? What are the consequences of an unbalanced power source?
The 3 phase power would be unbalanced but they never are if you are running other single phase devices also. Consult an electrician and he can look at your overall setup. www.quora.com/Can-I-run-single-phase-equipment-on-three-phase-power
There is a reason why your on top of the search results. You have the best tutorial
I was actually thinking... wow... for a rather low polish low flash video... THIS IS AWESOME.
This was the single best explained solution to a problem i had in electronics i had for a while. Short, concise, and working. I am astounded and i thank you very much.
You're welcome.
This is awesome.. I was using a DDS to create 3 sine waves, problem is it becomes expensive this is perfect cheap solution. Thanks a heap
Critical to my thesis. Thank you for this
I used to make these simple phase shifters over 20 years ago. The author's o-scope shows the output signal level staying constant, which is not possible with the circuit shown, so I believe the o-scope signals are in actuality taken from a phase shifter constructed of op-amps.
As one can see in the schematic, the reactance of the capacitor and the resistance of the resistor are in series across two signals 180 degrees out of phase. When the reactance and resistance are equal, a null point is reached where the signal is minimum. Not zero, because there is always a phase difference between the current in the resistance and that in the reactance of the capacitor. So, in reality, the output signal level will vary as you move through the resistance range - peak voltage decreasing to a (not quite) null point and then back to peak voltage of the opposite phase. This effect is lessened to a great extent with a higher resistance load on the circuit, but can never quite be eliminated (again, when using the circuit shown). The multi-megohm impedance of his 'scope is definitely helping here.
Op amps are used in most production phase shifters because the inherent balancing nature of the differential input of the op amp coupled with it's high gain can be used to automatically correct for the above-mentioned null effect. Also, the high impedance inputs of today's op-amps reduce the loading on the previous stage. There are several videos here on You tube related to design of op-amp based phase shifters.
One more point: the simple circuit shown here can never quite attain 180 degrees of phase shift. That is because while you can have zero resistance for one end of the phase range, you cannot (practically speaking) have infinite resistance for the other end of the range, which would allow for the full 180 degrees. The input impedance of the following stage has an effect as well. The result is that there will always be a small amount of phase shift remaining at that end of the range. You can get close, 178 degrees or more, and with op-amps you can get even closer, so close it is not worth worrying about.
Useful simple circuit. The simplicity and elegance as well as the hand drawn schematic on graph paper reminds me of Forrest Mims engineers mini notebook circuits.
Yes .. I grew up following guys like Don Lancaster and Forrest Mims. I collected all his mini notebooks he wrote for Radio Shack.
Hats off to all those guys who made electronics interesting and easier to learn.
Excellent publication
This is great! I've been looking for a simple circuit. I thought I'd have to go AC to DAC back shift, then through MOSFET to AC. I'd like to have two signals that automatically end up being 180 degrees phase shift from each other.
Best one....dude...
I just thought of it...and searched for it on RUclips and after searching for a few minutes...boom ..I got your video....
That was really helpful 🤗
You are doing a great job!!!
Nice work! Thanks for putting this video out there. people like you really add something the electronics engineering / hobbyist community
Glad it was helpful!
is it stable 20Hz-20Khz ?
Thank you. I will attempt to use this as part of a circuit I'm going to be building to control a 2 phase induction motor that needs a 120 degree offset. It normally uses a capacitor but the capacitor only works for certain frequency ranges and does very little at low frequencies.
I liked this video, good, solid , info. Thanks
What is the frequency did you put ?
And what frequency can it handle from start to end?
I need a 180 deg phase shift ckt for the given input signal any suggestion with ckt diagram
Very instructive video. Thanks for sharing.
Glad it was helpful!
This is great! I actually made one with what I had, a BC547, 1K resistors 10 nF and 22uF capacitors. It turned out fine. Now excuse my ignorance: it does not reach 180deg, only about 160deg. Is there any way of making it shift 180 deg?
It is technically impossible for this circuit to reach full 180 degrees phase shift, because that would mean you have zero resistance for one end of the potentiometer range, and infinite resistance for the other end. You can however get pretty close by increasing the resistance as much as possible on the high resistance end. Maybe you can get to 175 degrees but that's just guessing.
Good video.
Really nice! What is the frequency band of this setup?
how do u get the value of each component?
Can you not combine collecter and emitter outputs via decoupling caps to a common pot ?? outputto next stage from slider ?? H6UK
Excellent !!!!!
well my project is phase shifting the gm 4 pin ignition module I ques that thing runs around 33-333 hz in stages I ques so how do I determine what values shuld I use for the rc network? Wuld It by posibel to use darlington transistor alone with out the limitations that the ignition module offers ? I have terribel cold start problems in winter coil saturation is terribel I need amplifier ignition and that deam module simpli does not work at lowr engine rpms I think it was marked around 700rpm I do lot engine conversions like hot bulb or hit and miss engines so I kinde of surche for circuet that can control well the pick up coil signal or kinde of if posibel to phase shift it from 0 to 360 ° by demand . So hoppe some one has some advice about that topic . Any way I manuali control my engine any way by mechanical levers and programabel jetts so tehnicali speaking I was wondering culd I simpli use some power darlington transistor with out that shiti 4 pin gm ignition module? Again that thing is terribel .I culd not finde exact data for my pick up coil volts and frequency ratings some peopel say it makes around 3 volts minimum suposedly that shuld by enough to trigger the ignition module and the module it self has stages of operation like(start,run ,stall mode)depending on the actual voltage aplied to the input pins of course also depending on the frequency range it operates . So Im literali confused how to deal with that thing I hoppe some one finde the time and checks the 4 pin ignition module circuet diagram who uses the mc 3334 ic chip from motorola . I honestli dont know how to apply calculation for rc network for that thing .
What would the circuit look like to phase shift a PWM signal?
Great video thank you so much! I'm a physicist so my electronics skills are really lacking but this video is a godsend for what I need to accomplish. Quick question, you mentioned I would need to change the components depending on the frequency band I was using. How would I calculate the values of components I would require?
The quickest way would be trial and error with different values until the desired results are obtained.
@@0033mer Ok thank you!
I need an easy controllable way to control the phase for a set of signals I'm sending to an electromagnetic coil. This set up is beyond ideal for me, especially if I incorporate digital potentiometers.
I had one more question while thinking about how I was going to implement this. How would using a different voltage range effect this set up, if I wanted to use a AC signal at +/- 140V how would I need to change the circuit?
Thanks again for taking the time to reply to my first question and making the video in the first place
You would have to attenuate the +/- 140v down to to a safe level.
You've read the signal from collector and emitter. What is at the output. Is it the difference between the two signals as pwm.
This is basically reducer of voltage and current between capacitors which by themselves create a phase shift.
Yes, that's the great part about it. Its make sense and give us newbies creative freedom. It's basically a comparitor. Plus and minus voltage and output the remainder
GREAT JOB
Hi, im trying to build a phase shifting circuit which can handle enough current to power a 3 phase ac syncronous motor
I don't see a reduction in amplitude of output with respect to input on the emitter side due to the BE diode drop. Is that because the collector output is helping to cancel that effect?
Will this work on a 0.5Volt signal sent between a USB function generator and a 200* power amplifier?
This is what i need, but i have noob question here
V
V
Is this circuit work at frequency 30khz up to 400khz ?
Up! I want to know too!
Is this circuit independent of frequency? Does it provide required phase shift for any input frequency?
It is frequency dependent, he said so in the video
@@larsenmb Sorry, I missed it.
@@Debraj1978 np:)
what frequencies does this operate at
If we cascade the circuit, will it achieve 360 degree?
I am wondering if is usible to square.. probably not coz RC coupler on output.. shame i need it xD
Went to search you on patreon. Did not find you.
Not monetized, no patreon .. my channel is just too small.
what if I want to phase shift a high voltage in the range 100 to 250 volts AC?
What would the circuit look like?
Please help.
Run the output into a power transistor.
@@jjhack3r How do I connect the power transistor to control High voltage?
Thanks for your reply
OPAMP based shifter possible?
It has a bug. It uses voltage divider biasing which is sensitive to biasing resistors and power supply ripples. I found an opamp circuit which gives much stable output.
cycle the phase shift, say one shift every 5 seconds
hi 0033mer:
i have a sine wave signal which is 50Hz. i wanted to make a phase shift for it and i did your circuit but it didnt work. only i got 145 degrees of shifting phase and also unfortunately i cant change the freq of phase . may it cause by capacitor which i used at very left and very right on your scheme.there are two polered capacitor and i used polered electrolytic capacitor with 10uF, 25V ranges.
do you have any advise for me??
The component values used in the schematic will not work with a frequency that low. Change the values of the 5k pot and .022 cap (RC circuit) to make it respond to 50 Hz.
@@0033mer thanks a lot for quick respons :)
i made it with 1mohm pot and 0.01uf capacitor. i can change phase about 130 degrees now,and its ok for me. but there is an another problem. when i prob the output of the phase shifter , there are 2-3dB noise happining. do you have any advice of me for that situation ??
Make sure your power supply is clean.
do you have another social media?? :)
No ... no social media footprint.
how can I contact you via email?
Check the "About" tab.
Could you tell me how to calculate the values of the potentiometer and the .022 uf capacitor to work in the 10 MHz to 20 MHz frequency band?
If I'm making a batch of circuits where I need to have 120 degrees phase shift, should I use a PLL circuit to reach the desired phase shift?
Kun je dit ook doen met 230 volt, 16 ampere installaties? En wat zou je daar dan voor nodig hebben?
hi..works with any kinf of freq?
This is simply stunning and I love this project. But forgive my ignorance, is it theoretically possible to adjust the phase of 500khz or even 10ghz sound waves by adjusting the resistance value?
is you input ac?
I want to shift my microphone's signal phase.Can ı use this circuit as a micpreamplifier and also as a phase shifter by changing the gain of the transistor?
Thanks so much. What would you use as phase shifter if the power is in kilowatt range?
is "8V signal input and process" possible?
This circuit can work with high power rating like 50 watt
I built this circuit, and it does not work as stated. It is not unity gain. It changes in amplitude as you adjust the potentiometer. It does phase shift though.
As stated in this video this circuit is frequency dependent. At the intended frequency (around 1-5kHz) it has unity gain throughout the range of phase shift. At high frequency it attenuates quite a lot as you shift it.
Nicely done.
10 microF capasitors? Is it error?
No.
20 / 5 = 5?
Yes ... it was a late night. Correction was addressed in the description box.
EXAMPLE OF USING THIS CIRCUIT?
Thanks for the vid. Very helpful content. How would you go about making such a device to handle 20-25 amps at 120V? For example: I'd like to run a single(split) phase oven, but only available source is 3 phase. Could a device be created to split the 120V leg 180 degrees and still be able to handle the high load? Seeking a simple circuit rather than a massive split phase transformer, of course...
The circuit is for small signals only and a redesign for heavy AC loads would be a big undertaking.
If your 3 phase power is 208 volts you can run your 120 volt circuits from one phase to neutral and your main 208 volt heater elements from phase to phase. I am doing that with a proffer.
@@0033mer Thanks for the response. Wouldn't it require 180deg phase shift on the connected phases to be balanced? What are the consequences of an unbalanced power source?
The 3 phase power would be unbalanced but they never are if you are running other single phase devices also.
Consult an electrician and he can look at your overall setup.
www.quora.com/Can-I-run-single-phase-equipment-on-three-phase-power