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Questions tagged [toroidal]

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Centre tapped transformer outputting uneven voltages, have I damaged it?

I am modifying a KEF PSW 2010 amplifier board to make it run cooler. The mod involves removing voltage dropper resistors on the input to the L7815 and L7915 regulators (+15V and -15V) and replacing ...
David Fear's user avatar
0 votes
1 answer
128 views

Transformers in parallel

I Have an issue with an electric gate motor, it originally had a Toroidal 250va 13.5V. Naturally this is an unusual sized transformer and the space allocated makes a replacement difficult. The Unit is ...
epicfatigue's user avatar
0 votes
2 answers
92 views

Is it safe to wind a primary with parallel wires to increase current carrying capacity?

Is it possible to increase current carrying capacity of a toroidal transformer by using two 16ga enamel wires? This is for a step-up 120-240 VAC toroidal transformer I want to wind.
nitrous dude's user avatar
3 votes
3 answers
220 views

Can the DM inductors of an EMI filter be wound on the same core?

I want to implement the following EMI filter containing two separate LC filters such as DM and CM filters. Obviously, the CM inductors must be wound on the same core. Can I also wind the DM inductors ...
WeTech's user avatar
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2 votes
1 answer
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What is going on regarding power toroid shielding? (some shielded, some unshielded, no apparent difference)

In this Digikey search for 47uH toroid inductors, the shielding column shows that some are considered shielded, and others are considered unshielded. And even from the same manufacturer (Bourns). A ...
MicroservicesOnDDD's user avatar
2 votes
4 answers
388 views

Toroidal core winding limitations

For traditional laminated EI mains frequency power transformer cores, the core dimensions and core material determine, for a given primary voltage and frequency, a minimum number of primary turns ...
Math Keeps Me Busy's user avatar
0 votes
0 answers
137 views

Help identify this inductor / choke / coil

This is from a Socket 370 motherboard (Epox EP-MVP3G-M) that has some burst caps. Sadly it also seems to have taken one of the inductors(?) with it. I'm having a heck of a time trying to order ...
Simurr's user avatar
  • 145
0 votes
1 answer
587 views

Building a toroidal transformer core

I found these stainless steel wires (in diameters 0.3mm to 3mm) being sold in affordable prices. My question is whether it's a good idea to wound a thin wire (0.3mm diam.) like the top-right donut ...
Elementronics's user avatar
1 vote
0 answers
78 views

Current transformer (CT)

I want to make a current transformer with specified of 300/5 (I do not want to buy). The tools I have are Silica sheet, Magnet wire‎ and LCR meter. According to this formula "L = NΦ/I" I ...
Behnam khorasani's user avatar
0 votes
2 answers
811 views

Double secondary winding equal to center tap?

I am trying to create a power supply with both positive and negative voltages. Is it possible to use this transformer to create such a supply? : https://my.element14.com/vigortronix/vtx-146-050-215/...
Roger Dsuza's user avatar
0 votes
0 answers
352 views

Low Power Toroidal Conductivity Sensor Inconsistent Values

I have been trying to build a low power toroidal liquid conductivity sensor using the principle given in this image. This link has more information about the principle behind the sensor. What I have ...
Harid444's user avatar
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0 answers
246 views

Drive Capacitive load with toroidal transformer

this question is related to my previous post: Toroidal transformer voltage breaks down I am trying to build a circuit that drives a capacitive load (approx. 9nF) through use of a toroidal transformer. ...
Robert Reichel's user avatar
0 votes
1 answer
305 views

Toroidal transformer voltage breaks down

I am having some trouble understanding the behaviour of my toroidal transformer. Currently, I am using a 400V to 12V transformer in reverse, meaning I supply 12V and around 1.5 A to the secondary side ...
Robert Reichel's user avatar
0 votes
1 answer
100 views

Preventing my amplifier from being fried again and using diodes

I'm experimenting with sending different signals through different toroidal coil windings, I also place a ball compass in the center to see the type of rotation it creates. I would like to prevent ...
Rick T's user avatar
  • 205
1 vote
1 answer
403 views

Can I Connect Two Totally Different Transformers in Series?

I have 2 totally different toroidal transformers I want to put in series to make 75vac total. I have a decently large toroidal transformer in which I wound many, many turns of 10 gauge wire around. To ...
ElectronicsNoob's user avatar
1 vote
2 answers
1k views

Which way of winding the toroid ferrite ring is correct?

Following my previous question I'm trying to prepare a test to see the effect of a torodial ferrite ring. The setup will be simply as below: simulate this circuit – Schematic created using ...
cm64's user avatar
  • 2,183
1 vote
1 answer
179 views

What's inside this current limiter?

This component was inside an isolation transformer. It's obviously for limiting inrush current, but how does it work and what is inside? I believe it's a relay of some sort, switching a resistor in ...
Swagministeren's user avatar
2 votes
1 answer
283 views

DIY transformer (toroid) waveform

Update Ok, it may be related to the adhesive I'm using to glue the toroids on the 3D prints.. I'll wait till tomorrow for it to cure and test again.. I'm trying to build a portable/battery ...
Wesley Lee's user avatar
  • 7,944
0 votes
2 answers
2k views

bobbin vs toroidal inductors

I bought 100uH inductor for my boost converter, one toroidal (DTPU100A3) and one bobbin (DSZ-9/100/2,2-V), both form faryster. In the beginning, I thought both will give me same results, but the ...
Dobijasek's user avatar
1 vote
2 answers
1k views

Questions about SMPS Toroid winding

I'm making a simple SMPS to create multiple isolated outputs to audio effects circuits. I need to make a toroid pulse transformer which has one primary and at least 10 secondaries. These secondaries ...
Richard's user avatar
  • 309
0 votes
1 answer
3k views

Calculate required toroidal core size(Cross section area) for transformer [duplicate]

How to calculate required toroidal core size(Cross section area) for 200VA transformer.is that any formula or method to select core.I mean to say suppose I won't make 200VA toroidal transformer so how ...
Sandeep's user avatar
  • 51
0 votes
2 answers
2k views

Can I overlap magnet wire when wrapping a toroid or must it progress linearly around the circumference?

I've been playing with inducing magnetic fields in a ferrite toroid with turns of magnet wire. Can you overlap, e.g. double back over the previous turns so I don't need a larger toroid?
RobC's user avatar
  • 155
0 votes
1 answer
2k views

How to connect toroidal transformer from wall power

How to I connect 240v from a wall powerpoint to a toroidal transformer? I've searched all over, and I'm a complete novice, and I cannot find anything that explains what I need to know at my level of ...
kevinpwns's user avatar
4 votes
3 answers
1k views

How should I properlly draw on a schematic a shunt going through the center of a toroid coil?

So I'm trying to reverse engineer the schematic for an Avair AV-200CN SWR bridge. Two toroid coils, used for sensing, are mounted on a shunt, so that the shunt goes through the center of the coils. ...
AndrejaKo's user avatar
  • 23.5k
1 vote
2 answers
2k views

Inductors, Toroid or EE Core?

I'm designing a voltage mode PSU for learning purposes. I've noticed that powdered iron toroids are almost exclusively used in the construction of PFC inductors as well as in low voltage boost ...
iuppiter's user avatar
  • 235
0 votes
1 answer
223 views

Current in Secondary Windings of Toroidal Transformer

I am trying to design a toroidal transformer with multiple secondary coils. The core of the transformer is rated at 2500VA. Each of the secondaries powers a dc servo motor wich is subjected to a ...
Dan Kelleher's user avatar
2 votes
1 answer
2k views

Toroidal inductors - Heat Problem

I'm working on an isolated 2-sw forward converter. The output section has a toroidal inductor that I've a problem with. Here's how the output section looks like: simulate this circuit – ...
Rohat Kılıç's user avatar