A transformer couples two or more AC signals through a magnetic field. Often used as galvanic isolation and to transform one AC voltage to another.

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32 views

Strange behavior on transformer driver

I'm trying to make a circuit to drive a transformer from a PWM signal produced by an AVR MCU. Here's the schematic: The MCU output in fact has 2 complimentary PWMs feeding two transistor pairs. For ...
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1answer
25 views

Signal Transformer Characterization for SPICE

I would like to capture the dynamics of a signal transformer (make a good model of it for spice) . I can characterize the transformer as a band pass filter with a gain, or use the built in ...
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0answers
33 views

Fixed ratio dc to dc converter with isolation [on hold]

I am relatively new to electronics.I need to have a fixed ratio DC to DC converter with isolation in my design.(The ratio is approximately 6. For eg, 24 V input must output 4v). Is there a way to ...
0
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2answers
58 views

Transformer tolerances?

How much can a transformer go without a failure? For example, let's say that a transformer is designed to work with 500mA. (obviously you should avoid exceeding this limit) But as I learned with ...
3
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2answers
78 views

How to properly wind a high frequency / high voltage transformer?

Please, is there any practical tip / caveat I should be aware, when winding a high-frequency transformer? I'm used to wind 50/60Hz transformers and they do work ok, but now I'm trying to make a high ...
6
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4answers
233 views

What is a flyback?

Trying to find this answer is so difficult that I can't even tell whether What is the difference between a transformer and a coupled inductor? is asking the same thing. Some reading suggests that a ...
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1answer
66 views

Magnets in Transformers Desgin

What is the advantages, and disadvantages of using neodymium magnets instead of ferrite cores in transformers? How would the magnetic flux density vary of such a transformer utilizing a neodymium ...
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0answers
49 views

How to measure a transformer [on hold]

So, I got a sound mixer from a friend saying it's not working. I opened it up and plugged in. First time, the whole mixer just wasn't working. Next time, something in transformer made a huge BOOM. The ...
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1answer
63 views

Coil Gun Schematic [on hold]

I have a question. I have been looking at making a Coil gun lately and i had an idea for a simple one. Just need to know if it would work. Basically: Battery-->Switch-->Diode-->Transformer-->Coil For ...
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1answer
44 views

6 wire transformer

I have a transformer that is rather unusual. My issue is I have no Idea what wire does what. It is a 6 wire transformer. On one side we have one white and one back. On the other side we have one ...
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2answers
43 views

Identifying a transformer [closed]

I bought an electroplasma lamp from Lave the original, and the lamp is basically a plasma globe. I took out the circuit within the lamp, and it had a transformer with a sticker FB-DY-200B CB, is that ...
3
votes
3answers
135 views

Powering a microcontroller inductively from mains wire

I am in the process of making a mains power monitor using a SCT-013-000 CT clamp and an arduino mini, running on batteries. Even though I should be able to get many months of operation from two small ...
0
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0answers
45 views

Secondary Voltage Test [closed]

I have searched high and low on how to figure out this test with no success. Any help would be appreciated. There are 7 wires on a secondary circuit. None of them are identified. When you measure ...
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0answers
27 views

Primary and secondary winding ground of transformer short circuited

I am using a 1:2 step up transformer in my circuit i.e. Dynamic Voltage Restorer. I need to double the voltage at the output from 230V to 460V but don't need any isolation. Can I short circuit the ...
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2answers
46 views

Doorbell to buzzer with relay and AC to AC transformer

I have the following buzzer and want to use it with a switch by the door. Would the following configuration let this work or are there crucial parts missing? simulate this circuit – ...
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1answer
32 views

Specifications for a flyback transformer

I'm building an SMPS that takes in 110/220V AC and outputs +/- 3.3V DC. The chosen topology is flyback and as is the case of flyback transformers, I need to get one custom made. I have the Np:Ns and ...
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2answers
76 views

Transformer drawing 29x more current than it needs

I have an old transformer (20+ yrs) in a building I manage (GE Model 9T23B3872), it takes 277V 3-phase and converts it to 120V 3-phase. It seems very wasteful. It is drawing a combined 8.7 A @ 277 V ...
2
votes
1answer
50 views

How to select a gate driver transformer

I designed a Half-Bridge power supply using Gate Driver Transformers to drive my two MOSFETs. It's working great, I winded the two transformers around very small toroids with some turns, I didn't ...
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0answers
14 views

Estimate realistic parameters of transformer for educational simulation of DC/DC converter

I am trying to simulate a full bridge DC/DC converter with SimPowerSystems for educational purposes using the datasheet of a specific converter as example. For the simulation I need the following ...
0
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2answers
68 views

In a single-phase transformer output, which-wire would be phase, and which-one would be neutral?

In a single-phase transformer input, one wire getting entry as live, another as neutral. But what would be in case of its output? In output, which-wire would be phase, and which-one would be ...
2
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1answer
54 views

Specification of IF transformers

I am trying to understand how radio IF transformers are characterized and specified. In the image above from a Mouser catalog are three different IF transformers with a center frequency of 455 kHz. ...
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0answers
16 views

Two shaver sockets on same circuit with extractor fan [migrated]

I've just had a new bathroom installed(UK based) and the electrician has put two shaver sockets(110V and 220V outlets) and an extractor fan on the light circuit. With two toothbrushes plugged into ...
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0answers
24 views

Power transformer configuration: What factors affects the choice of a power transformer

How a specific type of power transformer (\$\Delta/\Delta, \Delta/Y\$ etc) is chosen for various step-ups and step-downs. In which case ungrounded neutral or Peterson coil grounding is preferred.
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1answer
51 views

mA output testing/validation

I need to validate the 200 mA @ 24 VAC claim on a Transformer/Power Supply. I have some resistors but I don't know how to proceed. Help anyone?
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2answers
38 views

Deltron W127G Transformer

Hey I have Recently Purchased A Deltron W127G Open-frame Power supply, but I am confused on how the transformer works. And Since I do not want to blow the thing up I figured Id ask first. The ...
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1answer
34 views

Input power with PF, impedance on transmission line and transformer

I've just had and exam (Renewable Energy) and we had a problem that I'm not sure if is correct. The answers should be simple as we haven't studied tranmission lines at all. Okay, here we go. We have ...
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2answers
58 views

Power Draw of a Small Transformer

I couldn't find the answer to this anywhere so, how can you tell what the power draw, in amps, of a transformer is knowing the input voltage and turns on primary and secondary.
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1answer
76 views

Voltage dropping capacitor and small voltage transformer

I want to make a mains voltage sensor for a power meter project. Since space is an issue, I looked for an alternative to a full size mains transformer. Is possible to use a voltage dropping capacitor ...
0
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1answer
39 views

Initial permeability of toroids in ATX power supply?

I'm interested in re-using output side or possibly the line filter toroids from a junk ATX switching supply. All turns are removed, just the core. I think these are powdered iron cores and any guess ...
0
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1answer
37 views

step down transformer 20-0-20

I want to make transformer which can convert 220 volt ac to 20-0-20 volt Ac(Step Down) 6 Ampere for audio Amplifier. Now I have a question that For 6 Amp Calculation I should consider 3-0-3 Ampere for ...
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1answer
36 views

Making planar transformers in Altium

Does anyone know of a decent (repeatable) way of making planar transformers/planar inductors in Altium? And if so, how was the experience? Drawing out the tracks and checking trace/space clearance ...
1
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1answer
31 views

Intermittent Pulses in Anti-phase Step Generator

I've recently been studying some old circuits, in particular some of the Heathkit circuits and I'm currently looking at this one: IT-1121 Curve Tracer. Here's a snippet of the step generator which ...
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2answers
55 views

Impedance matching for piezo element

I am trying to boost audio signal from around 3V to around 60V for a piezo element with a component as small as possible. I found audio transformer MET-23 that reflects 1.6 kOhm impedance on primary ...
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2answers
52 views

Tesla coil charging the battery with AC?

For Tesla coil, eventually the capacitor voltage becomes so high that the air in the spark gap is unable to hold-off the high electric field and breakdown occurs. But usually from what I know DC ...
0
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1answer
41 views

What is the transfer function of a transformer?

Consider transformer as a black box. We give arbitrary input voltage \$x(t)\$, what is the output \$y(t)\$? Naive thoughts: if \$x(t)\$ is a sin-wave, \$y(t)\$ is a sin wave also, with the same ...
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2answers
71 views

Power Supply Circuit ±9V from a 6V centre tap transformer

At work, there's a power supply which is used on one of our products. The guy who originally made the board has since left and none of the senior electronics guys could give me a good answer. Here's ...
1
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1answer
68 views

Designing a Smaller 2000W Transformer PCB to Run 220V Heating Element on 110V

I'm trying to design a step up transformer that can run my 220V heating element on 110V outlet. I've looked for such transformers through retail, but most of them are bulky and heavy. Is there a way ...
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1answer
69 views

how i can get 5V AC output from 230V AC [closed]

how can'i get 5 V AC output 230 V AC: input? for a measurement unit bases on DSP?
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2answers
69 views

2 amp transformer alternatives [closed]

Beginner here, please bear with me. I'm following instructions to modify a popcorn popper for coffee roasting: http://popperyii.blogspot.com/ It looks like it requires a 25.2 VCT 2A transformer ...
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2answers
80 views

How does the secondary coil of a transformer affect the primary coil? How is it in case of Step-up and step-down transformer? Does it obey Lenz's law?

What changes will (of voltage, current, energy, power, etc) happen to the Primary coil, if an AC supply given to the primary coil, but; Secondary coil circuit is turned OFF (Open), Secondary coil ...
2
votes
1answer
98 views

Is there any Phase difference between the current in primary and secondary coils of a transformer?

Is there any Phase difference between the current in primary and secondary coils of a transformer? If I draw the diagram of a transformer, and try to find-out the direction of current using Lenz's ...
0
votes
1answer
57 views

Connect Two Transformer in Series

I have two transformers with a 220V primary and 12V secondary winding. What will happen if I apply 220V to the primary of the first transformer and connect the two secondary windings together? Will ...
0
votes
3answers
84 views

Is power rating of transformer determined by input or load?

Scenario: I have current carrying conductor with a current transformer around it. If the load is rated at 5V, 2A and only requires 2W of power, but the primary side conductor is carrying 100V 12A. ...
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4answers
142 views

If a step-up transformer increases voltage, then how current can be decreased ? is really the current in output is smaller?

If a step-up transformer increases voltage, then how current can be decreased ? If a step-up transformer increases voltage, then how current can be decreased ? (I'm trying to ask that, in case-of ...
0
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1answer
33 views

Low weight split core transformer on 11kVA transmission line

I've seen transmission line energy harvester's that utilise a split core transformer. Here is an example. However, I fail to see how this is possible when a transformer cores which are small enough ...
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0answers
47 views

What is the coupling coeffecient of a 10.7Mhz if transformer?

Does anyone have a rough range? I just need to be in the ball park. As an experiment, I'm simulating some if amp circuits in LTspice and it looks like they are very overcoupled when using a coupling ...
3
votes
1answer
52 views

Voltage drop on transformer's secondary winding experiment [closed]

I've read things about it but I couldn't understand it. Let's say I have a 3-phase transformer and voltage of secondary winding is 230. When I keep adding 1k resistors (as load) in paralel it goes ...
6
votes
3answers
535 views

Audio transformer: What to do with an unused winding?

For the purpose of impedance matching and floating a single-ended, ground-referenced signal, I am planning to use an audio transformer like this one. Here's the schematic from the data sheet: My ...
1
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4answers
330 views

How safe is a current transformer

I acknowledge that the subject line indicates a "how long is a piece of string" style question, but I hope to make it more specific below. I have a "current transformer" (CT) purchased as part of an ...
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0answers
45 views

Tube Guitar Amp Audio Output Transformer Winding Theory

How do you determine the Output Transformer wattage needed on a tube amp? How do I work out the diameter of bobbin needed and primary/secondary wire thickness in an output transformer? How do I do ...