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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3answers
54 views

Can I use a transformer to drop a DC voltage?

Can I use a transformer to drop down the voltage from a generator? Or should I just use a regulator? The generator outputs about 9.3 V and I need about 5 V, and I want to conserve power.
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0answers
68 views

HOW TO CONNECT 100w LED IN TO MAINS 220V [on hold]

I wish to operate five of the LEDs shown below from 220 VAC mains. I have a limited budget and limited room for mounting so, the cost and size of a conventional transformer that would be required to ...
2
votes
2answers
46 views

Replace transformer with PWM control

This is my first question on stackexchange so if I do anything wrong, please let me know :-) So my situation is the following: I am working on a power supply module where I need 7 separated +28V DC ...
1
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1answer
49 views

Standard transformer for higher-voltage dual output flyback converter

Is it possible to modify this flyback converter to get the output voltage somewhere up in the range of +/- 26-60v (preferably 30v or more) without having to make my own transformer? I would also like ...
1
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2answers
52 views

Grounding a 30KVA isloation transformer

My company does audio visual services. When we use a single 120/208 VAC Three-phase "Y" power source for lighting, audio and video we get noise caused by the lighting dimmers injected into the audio ...
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0answers
34 views

Replacement transformer specs [on hold]

EEs I'm looking for a replacement transformer for a Vacuum Tube driven audio amplifier's power supply. The transformer label is titled as 240v but below reads as follows: 2 x 150v 35mA DC ...
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0answers
44 views

Thinnest transformer 220v to 5v [closed]

I'm looking for thinnest transformer (planar?), that convert 220v to 5v. Or maybe some other method, that allows me to convert 220v to 5v? I want to make it smallest as possible.
0
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1answer
44 views

what is the waveform difference between primary and secondary of transformer

I am talking about the autotransfomer. I am wondering how would the waveform be different is if I measure the Voltage at primary side, versus measuring voltage at secondary side. Is the general ...
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2answers
63 views

Convert 6 volts dc to 300 volts dc

I am trying to build a portable Geiger-Mueller tube that is run on 4 AA batteries. However, the tube runs on 300 volts. What is the most efficient way to do this. I have looked for transformer that ...
1
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1answer
51 views

Step up converters DC or AC?

The wikipedia article on Step up converters says A boost converter (step-up converter) is a DC-to-DC power converter with an output voltage greater than its input voltage. However if I look at ...
0
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2answers
54 views

Short-circuit primary side of a transformer to collect all the spikes at the secondary

Abruptly detaching a power source from a coil produces a back-emf: this is a well known fact. What I would like to achieve, in my experimentation, is to convey ALL the collapsing magnetic field to ...
1
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0answers
29 views

Passive harmonic filter: Why Immensely Hot and Humming

I encountered a passive harmonic filter, PHF with highly non linear loads, i.e. variable frequency drive, VFD (most of the time running 50Hz) serving an induction motor. I believe that it is a ...
0
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0answers
42 views

different voltage input on a transformer used as output

I have a transformer which I Take from my bridgeport milling machine panel box,I am thinking to make a phase converter and need 380v from my 220v single phase supply. this is the diagram of the ...
0
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0answers
26 views

How to connect a microcontroller to a magnetic coil loop?

I generated a 10MHz square wave from one output pin of a microcontroller using on and off mechanism. I want to give this as an input to the coil.I can connect the output pin to the one end of coil, ...
0
votes
1answer
55 views

Short circuit current in transformer

When transformer secondary is short circuited, what would be the value of current flowing through short circuited side? Shouldn't it be infinity ideally? If yes, is it only due to large cross-section ...
0
votes
2answers
151 views

How would I convert a 4.1(ish) volt li ion battery to 240v ac?

I'm fairly interested in electronics but not very educated in it. I was wondering how I would go about safely converting your average li ion battery pack to a usuable voltage (240v ac) for things ...
-1
votes
0answers
31 views

how to get pure square wave at input side of a high frequency transfomer

i need to get a pure square wave at the input of high frequency transformer in llc type dual bridge dc-dc converter circuit. but iam getting total pulses instead of square wave. do i need to connect ...
0
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0answers
36 views

Connecting an tube output transformer “wrong” to get different primary impedance

I'd like to build a tube amplifier (not for guitar), but have a problem in that it seems I cannot get an output transformer that is proper for the tube (required primary impedance and power rating), ...
1
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1answer
18 views

Wattmeter Required for Transfomer Characterization?

I have to characterize and test a small 6VA 230VAC Transformer. Seems like I will do 1) Winding Resistance Test - DC Test 2) Open Circuit Test 3) Short Circuit Test I do not have a wattmeter, ...
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0answers
52 views

Power adapters 5v

Today, I wired my home door bell to the mains because I had to keep replacing battery every 2 months... It required a 9v supply and I had two identical door bells. As I only had a 17v power adapter ...
0
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0answers
43 views

Do I need to insulate the inner box?

I am currently putting a transfotmer inside a metallic case. The transformer has to be grounded so does the metallic case. Looking inside the box, my frnd suggested that I might need to put a ...
5
votes
2answers
1k views

Wiring a 2.5km football field with 220v

I have a football field to wire up. It measures 900m x 450m. I need to connect multiple light weight devices that use a 100-220vAc adapter that convert the voltage to 24v for the daughter device. ...
-1
votes
1answer
34 views

liquid insulator by example?

can someone give me some example about liquid insulator .from some text which has been read by me it is just oil can someone told me the other one . it would be good if there is any book reference ...
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2answers
94 views

Minimum number of turns on a transformer

I am trying to wind my own transformer for a power supply. How many turns do I need on my primary winding? I know that the turn ratio determines the voltage ratio, but how do I determine the actual ...
2
votes
2answers
71 views

How much is a transformer's secondary floating?

Consider an isolation transformer with its secondary referenced to ground via a resistance R as in the following picture. simulate this circuit – Schematic created using CircuitLab If R ...
2
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2answers
71 views

How to mount a toroidal transformer in a waterproof plastic case

I have a toroidal transformer with mains input and 24V output, which I want to mount in an IP65 ABS plastic case. The transformer comes with two rubber and one metal disc for mounting, along with a ...
0
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1answer
32 views

Flyback Transformer Saturation in Secondary

I am trying to select a flyback transformer for a prototype I'm designing. Almost all flyback transformer data-sheets I've seen provide only the saturation current for the primary winding. The ...
1
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2answers
110 views

DO we have to ground transformer?

I am using the transformer (a ballast), and its specfication sheet could be found here ballast specification. But on the data sheet, it doesn't says where we need to ground it. Usually, we would ...
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2answers
111 views

What do you call a transformer separated from a wall plug?

I got a hold of (from a friend) a AC->DC 5v 2a power transformer - it connects to the wall with lamp cord/ figure-8 connector, and has a USB plug on the other side. I can't for the life of me find ...
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2answers
82 views

Transformer specifications to get 18V AC output from 230V AC in Proteus simulation

Can anyone help with the transformer specifications below, so that I can get 18V AC output from 230V AC input in Proteus simulation?
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0answers
58 views

Reusing a 17kw factory transformer?

I have found some large transformers in a pillaged factory in our town, the biggest one is a 17kw transformer, that isnt labeled clearly so i don't know what it does. I would like to make a 220v-5v ...
1
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1answer
92 views

Can I measure inductor current by adding a secondary winding?

I have a buck converter and I want to add a current loop to it. I don't want to use a hall-effect sensor or something expensive like that. I think it is not practical to use a sensing resistor since ...
0
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0answers
35 views

Isolated AC mains voltage Measure

I need to measure AC voltage and RMS, but I cant find a good reference. I think that I would need a transformer to step down the voltage, then some kind of amplification to center the AC voltage ...
0
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1answer
74 views

Wi-Fi controlled light; 230VAC - 12VDC/3.3VDC

I try to connect an ESP8266-12 and a 12V RGB LED strip to 230V AC. Based on this link, I've came to the following scheme. This will also be the first time I will etch a PCB myself. The partlist will ...
2
votes
2answers
89 views

Does adding a capacitor with a transformer makes it a LC filter?

when i add a capacitor with a transformer is a LC filter formed? Moreover if it acts as a LC filter then what inductance to be considered for checking the frequency response of this filter, whether i ...
0
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1answer
60 views

Wind high impedance transformer at home

Suppose I need to make transformer at home, but I am unable to wind 100k turns obviously, then can I just connect a resistor in series with a winding to achieve desired impedance? Will it have serious ...
0
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0answers
22 views

Hgh frequency transformer with EI core

I want to design a high frequency transformer with ferrite EI core. I have found the area product of the transformer ,but could not find the corresponding E and I values.Please help me in getting the ...
0
votes
1answer
55 views

how to put physics formulae/laws together and make transformer?

i want to make a transformer, i studied all the formulae of physics, for magnetic flux, Emf, mutual inductance, inductance, transformer equations, turn ratios, solenoid etc. but still i can not put ...
0
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0answers
24 views

MOT frequency range

I want to use a rewound microwave oven transformer (originally 60hz) to transfer large amounts of AC power. What is the range in frequencies I can use without too much loss (ex. 50 to 70 hz with a 5% ...
0
votes
1answer
67 views

What does the CT (center tap) value mean in a transformer datasheet?

I came across this datasheet, and I am unsure what the CT portion means. The datasheet does say that CT means center tap, but specifically in the image below what does the "10k CT" betweeen primary ...
0
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1answer
44 views

Help understanding microcontroller-to-transformer circuit

I have had a hack and understanding how a circuit board works and have hit a snag in understanding one part. The circuit is driven by a microcontroller and has two isolated, biphasic AC outputs. The ...
0
votes
3answers
101 views

How to differentiate center-tapped power transformer from a non center-tapped one?

I'm a hobbyist and I have 2 doubts regarding a power supply described into this schematic: 1) How do I differentiate a center-tapped power transformer from a non center-tapped one? My primary ...
0
votes
4answers
54 views

Using all the taps of the transformer at the same time?

Let me clarify, I have a power transformer with 2x15V secondary (3 secondary terminals). I want to feed a full wave rectifier with 30 V (using the outermost 2 terminals), but at the same time I want ...
0
votes
2answers
58 views

What is a safe and efficient diy or commercial solution to convert 120VAC to 120VDC?

I want to power a series system of ~4 x high power leds, each with a forward voltage of 30-34V. I understand that I can use a diode bridge rectifier to convert AC to DC, but this will have a ...
-1
votes
3answers
34 views

What happens if i kept open the other output terminals of a 3Tap transformer?

I'm having a transformer having 3 pairs of output wires.Out of these 3 pairs I connect my circuit with the first pair of wires and left open all other wires except input.Will it work correctly or ...
0
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0answers
28 views

Explain the notification(ECT-PRI-230V)(SEC 12V-3TAP) found on the transformer

I'm having a transformer.I dont know its ratings.It has a sticker showing (ECT-PRI-230V)(SEC 12V-3TAP).What does these notifications mean?
2
votes
2answers
97 views

What is the source of leakage current thru an isolation transformer?

I want to use my oscilloscope to check the cleanliness of the output a high-voltage power supply (electrophoresis type, up to 3000 volts DC). I built a 100:1 voltage divider (out of 2 resistors - ...
0
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2answers
92 views

What are the terminals of a 6 wired step down transformer? [closed]

I'm having a Transformer with 2 input wires and 6 output wires(in pair).I dont know it ratings also.Please help me to find what the terminals are?
0
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2answers
63 views

DIY Isolated Power Strip?

Would it not be ok / safe to take a surge protector style power strip, cut the mains cable in the middle (or maybe slice it open and just fish out the load and neutral wires so that the ground wire is ...
-1
votes
1answer
74 views

grounding a 220 -> 110 V transformer

i'm in brazil my house has 220V power i have a transformer that converts 220 to 110V it has 2 prong power and 2 prong power out i would like to get the output grounded. I'm hooking up things with 3 ...