Questions tagged [transformer]

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.

Filter by
Sorted by
Tagged with
-2
votes
1answer
272 views

Transformer control using a MCU

I am trying to generate 12V output using this transformer. From the datasheet it states that Vin can be 20-48V at 150kHz. Now, I am trying to send a pwm to a MOSFET that will control the connection to ...
-2
votes
1answer
135 views

Calculating a transformer's Short Circuit Current P(sc) [closed]

A 50KVA, 2300/230V, 50Hz transformer has a high voltage winding resistance of 0.65ohm and low voltage resistance of 0.0065ohm and this transformer has been tested to determine, its equivalent circuit, ...
-2
votes
2answers
128 views

Using a charger backwards [closed]

I was wondering if connecting a 5 volt source to a 5 volt charger is going to yield 220 volts at the plugging terminals(the charger is AC/DC,220 volts input and 5 volts output)As far as I know,every ...
-2
votes
1answer
610 views

Transformer ratio test …deviation close to the limit

When conducted ratio test .33/11 Transformer gave a ratio deviation of 0.48 % for first tap ..it is the commissioning test .the Standard deviation is 0.5 % .for all other taps the deviation is well ...
-2
votes
5answers
738 views

Making a 15V transformer [closed]

I presently have a transformer with 12V DC output.But I want to charge a 15V battery.So how can I make the 12V transformer to 15V ?
-2
votes
1answer
172 views

What's the thick wide aluminum tape used for in last mile grid transformers?

This YT video (scrolled to 0:45) shows the process of fabricating a pole mount transformer. At 0:45 the following is shown: there's a wooden brick used to hold everything together, it's covered in ...
-2
votes
1answer
72 views

My Rf reciever circuit on battery ,but not with a rectified xformer output as source

I just made a Rf circuit that turns on and off a relay depending on the transmitter's message The circuit is working fine when i connect it to a 9v battery. But i cant get the circuit to work with ...
-2
votes
1answer
162 views

transformer's basic operation

Doesn't the induced voltage (v1) suppose to oppose i1 flow, so + and- should be inverted? Is it possible for the same transformer that v1/v2=-a and i2/i1=a (for example if it is possible to reverse ...
-2
votes
1answer
5k views

At very high frequency (700 kHz), an AC circuit has a voltage reading 10 times the EMF, why is this?

I've set up an experiment in which I vary the frequency of an electric signal using a waveform generator. The experiment is testing a transformer, but I've encountered a problem on the primary circuit ...
-2
votes
2answers
250 views

Single pole AC to DC conversion circuit

I am thinking about making a remote control light switch that fits into the existing light switch panel. And to power up the electronics that would requires a 3.3V DC supply. The problem is, the ...
-2
votes
0answers
32 views

The ramp generator in the following circuit is designed to work with 60HZ line frequency to generate ramp peak voltage of 10Vp [duplicate]

I have attached what is the question and what i have done till now... help me to proceed further. I think we have to change ramp rate.
-2
votes
1answer
176 views

Center tap transformer pairing with ATX PSU

I'd like to use both a beefy center tap transformer (220v to 24-0-24, 1000VA) and an ATX PSU togheter, to power some lab equipment. So I isolated from case the ATX GND on DC side as the case is earth ...
-2
votes
1answer
98 views

Transformer Windings - Quick Question! [closed]

I have added a picture of the secondary side of a transformer (crude drawing) in my understanding a battery causing current to flow through a difference in electrons. In this scenario with A/C ...
-2
votes
3answers
746 views

Transformer amperage drop

Let's say we have a step-up transformer which receives an input of 2 Amps at 100V. (200W) Let's assume we get a 1000V and 0.2 Amp output. (same 200W) Output amps are obviously determined by the input ...
-3
votes
1answer
195 views

Can I pull ampere out of transformer as I want not as my circuit need?

I have transformer with max ampere 20Amp, If I tried to charge 12V battery with it, it gives 2Amp..I want to do something that force transformer to gives 10Amp for example...Is that even possible? ...
-3
votes
2answers
125 views

Is converting high voltage AC into high voltage DC possible for my application? [closed]

I want to convert 2,320 volts AC into 1,000 volts DC. But I’m not sure if I can do this with my transformer KVA rating. My power source is a 20 amp 120 - 125 volt outlet. With testiing the outlet ...
-3
votes
1answer
337 views

How does the copper loss vary with frequency? [closed]

In the context of a transformer, how does the copper loss vary with frequency? Is it greater at higher frequencies?
-3
votes
1answer
404 views

30-0-30 ACV 8A transformer to 12DCV [closed]

Good Day.. I have a 30ACV 8A transformer. I urgently want to make a 12DCV battery charger from it. What are the components that I should use? Please also help me out with its schematic. Your help ...
-3
votes
1answer
1k views

How to the calculate the value of capacitor placed in series with transformer to avoid flux walking in a buck converter? [closed]

The dc value of current in primary increases(in -ve direction) as time passes, so I need a capacitor in series with transformer, but don't know what value capacitor should I use. filter capacitor = 1 ...
-3
votes
3answers
2k views

The type of transformer having 6 output terminal and 2 input terminal, with an insulated conductors projected from its top?

I got a transformer from my system SMPS. I have heard about 2 terminal input, 3 terminal output transformers. But the particular one i got is having 6 output terminal. Also, there is an insulated ...
-3
votes
1answer
73 views

Maximum power transfer of transformer [closed]

We have this transformer: simulate this circuit – Schematic created using CircuitLab The power transfered to R1 resistor is maximized when the frequency of the signal is very big.This means ...
-3
votes
2answers
141 views

Solving for Amps in a selfmade furnace/heating resistance

I made a heating resistance out of a graphite bar I found. I will adapt this bar to a furnace in order be able to sinter Si3N4 (1850°C). After measuring dimensions, max. load of Si3N4 in the furnace ...
-3
votes
2answers
395 views

to keep power as constant either voltage or current changes [closed]

ohm's law states that voltage and current are proportional to each other. but my doubt is that "to keep power as constant either voltage or current changes" here the voltage and current are inversely ...
-3
votes
1answer
79 views

How can I use an Indian 2.1 speaker in United States? [closed]

I purchased a 2.1 (2 speakers , 1 sub-woofer) Creative Inspire audio system in India a few years back. I loved the sound quality so much that I brought it all the way to United States, forgetting that ...
-3
votes
1answer
105 views

Transformer leakage reactance

For a 4:1 transformer,the leakage reactance referred to secondary side is 0.05 pu. Then what will be the leakage reactance referred to primary? and how?
-3
votes
1answer
111 views

If you want to test a step-up transformer, must the load resistor equal the source impedance?

Ideally, do you want to add R1 to balance out the impedance so you get an accurate reading? simulate this circuit – Schematic created using CircuitLab I'm trying to find out the turn ratio of ...
-3
votes
1answer
760 views

Question about ideal transformer

Let's say that an ideal transformer has a rating of 500/125 V, 10 kVA. The source voltage applied to the primary winding is 525 V (rms). The load that is connected to the secondary winding consumes ...
-3
votes
1answer
2k views

How is burden measured? [closed]

How is burden measured for the secondary circuit of either a current transformer or potential transformer? Also, is there a test set made for measuring burden?
-3
votes
2answers
102 views

control transformer

In control transformer ,used in Switchgear i.e. 415V/240V—this transformer is single phase transformer or 2-phase transformer? As primary is 415 V which is tapped from 2 phase….while secondary is ...
-3
votes
1answer
863 views

can a fan regulator could act as a transformer?

what are we actually reducing and increasing on changing the regulator value? Current,voltage.? Is it based on resistance or capacitance? Power losses? Can a regulator can be used for current ...
-4
votes
1answer
176 views

why do the electronic transformers that i remove from circuit boards keep exploding when connected to a 230v main [closed]

for the past 3 months I have removed several transformers from PCBs to try and use it for a different purpose ,but as I connect it to a 230v main supply they just keep exploding . I don't think my ...
-4
votes
2answers
115 views

Iron losses is equal to copper losses [closed]

Practically how we see Copper losses are equal to iron losses in a transformer
-4
votes
3answers
623 views

Why first coil has more copper turns?

Why primary of transformer has more windings which secondary? I measure ohm in first coil and got more ohms than in the second coil! This is a transformer downer, because I put 230v on the side and ...
-4
votes
1answer
2k views

Transformer Design

All theories claim that there is a phase displacement of 180 deg between the voltage in primary and secondary. How this phase shift is over come when designing a transformer? For example a Dyn11 ...
-4
votes
1answer
765 views

how to increase or decrease common emitter amplifier Av gain [closed]

common emitter amplifier (BJT), With components, transistor hfe 300, AC signal 10 milli volts, 1KHz, Vcc 12, RB 1 = 15K, RB 2 = 2.2K, RC = 10, RE = 830 ohms, (the Av gain for this circuit is 12,) how ...
-4
votes
2answers
1k views

Reduce AC frequency

Can a resistor in parallel to L1 of a step down transformer be used to reduce the AC frequency? \$F=\frac{X_L}{2\pi L}\$
-4
votes
1answer
364 views

In step up transformer which side have high inductance?

I plan to use 1:10 center tap step up transformer, in my circuit design. But I have one question, which side have high inductance in step up transformer? (Primary or secondary) Give me some hint of ...
-4
votes
3answers
130 views

Connect tranformer and a toroidal one? [closed]

I want to upgrade components on my state amplifier. And adding another transformer might be the biggest change. Is it be possible to connect in parallel a normal tranformer and a toroidal one for the ...
-5
votes
3answers
188 views

How is it scientifically possible to step up or down a voltage? [closed]

Is it breaking/bending any physics laws? Is it creating energy out of nothing?
-5
votes
2answers
87 views

Wiring a 7705 5V Regultaor [closed]

I went to the store the other day to pick up a 7805 voltage regulator. (5V DC) However, the store was out and so I bought a 'TL7705ACP' IC 5V DC regulator. I am wondering how to wire it up, to step ...
-5
votes
1answer
407 views

Why reactive power is constant?

In a transformer let us assume a load is connected consuming certain active power; say 5000 W. Now if we put a different load of low power factor consuming same amount of active power, now here the ...
-5
votes
3answers
2k views

Why step up transformer is used at the generating station to step up the transmission line voltage?

In generating stations step up transformers are used to reduce losses. why?
-5
votes
6answers
1k views

What transformer I should use for negative ion ionizers

If I want to create a device that produces high static electricity fields, such as negative ion generators, what kind of transformer specs I should look for? I want super huge static electricity, and ...
-6
votes
2answers
1k views

If i change the transformer on my inverter for a bigger one, will it increase the watts? [closed]

If i change the transformer on my inverter for a bigger one, will it increase the watts?
-6
votes
3answers
432 views

Longest visible arc I can safely make with an alarm clock transformer

So I have an audio frequency transformer that turns standard US 120V power into two seperate 9V circuits: I got it from an alarm clock and want to create an arc with it, by turning it around and ...
-6
votes
1answer
309 views

Do transformers make batteries more dangerous [closed]

I have connected 8 AA batteries to a transformer to make a shocker. I don't know the exact transformer, but it has 5 pins, and I got it from an old 1950's radio. Does this make the battery pack any ...
-6
votes
1answer
296 views

Can I decrease AC voltage and increase current in a AC converter?

Can I decrease voltage and increase current for my circuit? Suppose there's an input source of 12V 1A AC. Can I change it to 1V 10A AC with a step down transformer? Can this be achieved in another ...
-7
votes
3answers
7k views

Why not multiply Electrical power with stepup transformers?

I saw youtube video showing a stepup transformer(from microwave) double the electricity than input. 12v input and 120v output. why not its possible if connect many stepup transformers(1st transformer ...
-7
votes
1answer
738 views

Home made Heat Sink [closed]

We needed a heat sink for a TEC1-12706 Peltier module. We made one by breaking a transformer and attaching each plate onto an aluminum plate. Do you think this will work?
-7
votes
2answers
68 views

Please explain this equation [closed]

I am reading about maximum efficiency of transformers.I am not able to get the second step.please explain...