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# Questions tagged [phase]

For questions about AC phases (e.g. three-phase systems) or phase in the context of waves, transfer functions, etc. Consider using in conjunction with related tags such as "three-phase", "transfer-function", etc., as applicable.

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### How is phase recovered from wireless signals?

I've wondered for a long time how phase information is captured for wireless signals. It's used in applications like QAM for decoding symbols and radar beam forming to to locate targets, but I've ...
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165 views

### Circuit or Equipment to delay high speed square clock signal?

Hi I have a ttl clock signal that id like to change the phase of to see if it changes effects the unit under test (not relevant but its a digital transmitter and an automated testing setup) this way I ...
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1 vote
164 views

### Can overhead ground wire of major transmission lines prevent induction through solar storms?

As I understand it the overhead ground wire found on major transmission lines is placed there in the event of a lightning strike which prevents a surge in the phase conductors. My question is, could ...
142 views

### Compare the phase of the voltages across components of a series RLC circuit

Suppose we have a series RLC circuit with equal impedances connected to a 50Hz 240Vrms AC. We use an oscilloscope to measure and compare the voltages across each component. 1) Are their "VOLTAGES" ...
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201 views

### How to utilize three-phase electrical in residential garage for antique shop equipment [closed]

I hope this message finds you well. Please explain how to utilize three-phase electrical in residential garage for antique shop equipment. The power company will NOT dig new lines for true 3-phase. ...
651 views

### Is it true that frequency deviation over 2*pi is the phase deviation of an FM/PM signal?

for ∆f frequency deviation if for FM only and PM has Phase deviation. and Kf= ∆f (Hz) of FM? Kf = ∆f (rad/s) for PM? and for th rules: ∆f=(kfmp)/(2p) for FM where mp = mp max-mp min ∆f=(kfmp)/(2p) ...
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1 vote
2k views

### Phase shift at very high frequencies

I was given a transfer function: $$H(s)= \frac{5 \cdot 10^8}{s^2+6\cdot10^4\cdot s+5\cdot10^8}$$ The question I was asked was , what was the phase relationship between input and output voltage at ...
168 views

### 240 V split-phase to power 12 VDC fans and lights

Im re-powering an model-81 Powermatic bandsaw with a 3 HP Leeson DC motor (14 A max. draw) and a KBCC-255 motor drive (fused @ 15 A). I want to put some fans to cool the DC drive heatsink and LED ...
3k views

### How do you calculate the voltage between two phases?

If I have two hot wires at given voltages and phases (for example 120v 0deg and 120v 120deg), how do I calculate the voltage between the two wires?
69 views

### Phase lag of an ISO124 isolation amplifier?

I want to use an ISO124 isolation amplifier. The input frequency will be about 100Hz. I'm trying to figure out what the phase delay will be from the input to the output and i'm not having any luck. I ...
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1 vote
918 views

### 6 phase forked star transformer

I have a problem i'm trying to get to the bottom of. I am basically trying to find the secondary line voltages of a three phase delta primary, with a six phase forked star connected secondary ...
6k views

### Staying in Phase On The Grid

I have been an EE for over forty years and never did find out the right answer to this one.... How do power-stations and transformer switching stations ensure that the power they are feeding into the ...
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1 vote
3k views

### Capacitive current leads, inductive lags, but how does this translate to voltage on an output?

I'm really confused about the capacitive current leads the voltage, inductive current lags the voltage. The reason for this confusion is the graphs I've seen in different sources trying to explain ...
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3k views

### Comparator: Noisy sine to square wave, how much phase noise?

In a circuit a comparator is used to convert a sinusoidal signal to a square wave. The input signal however is not a clean sine wave, but has some noise added to it. The comparator is supposed to be ...
• 432
1 vote
582 views

### Phase difference of voltages at one side of a transformer

Consider the circuit in picture simulate this circuit – Schematic created using CircuitLab Suppose that I measure VA and VB with respect to GND using an oscilloscope. Will VA and VB be in ...
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2k views

### Amplitude noise vs Phase noise

I've been reading that Phase Noise dominates in frequencies close to the carrier, while Amplitude Noise is more dominant in higher offsets. Could someone explain this?
839 views

### How can I create two ac signals with a voltage controlled phase offset?

Is there a fairly straightforward analog circuit (resistors, capacitors, transistors, etc) to generate two sine waves of the same frequency and introduce a relative phase offset between them? So I'm ...
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1k views

### Microstepping methods for stepper motors: PWM? Phase? Frequency?

I want to know what methods are used for microstepping stepper motors, and their pro's and cons For example, I presume, to hold the motor between two steps, PWM would be most efficient; simple ...
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1 vote
2k views

### Can I use a Triac dimmer circuit to control the brightness of an AC powered LED light strip? [closed]

I am using this Triac circuit to control the brightness of several incandescent lights. The circuit monitors the phase of the 120 volt wall current, then signals an Arduino when the phase crossed ...
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