# Tag Info

Accepted

### Why is this transformer placed on rails?

BBC sells these "skid-mounted" transformers as something that can be quickly unloaded from a semi truck. So, the rails are mostly for mounting comfort. Hard for me to put a mass to that ...
• 96.9k

### Different wire length on secondary of a transformer, is this detrimental?

Equal lengths are best for good balance, equal capacitance to ground. The higher the frequency the more important this is. I have not seen this on old 50 Hz 5 kV stuff. Balance is good for EMC.
• 15.2k
Accepted

### How do you choose an audio isolation transformer for a microphone?

The transformer that you linked to is not an audio transformer. There are transformers designed specifically for use with microphones. Their datasheets should give you the information you need, often ...
• 25.1k
Accepted

### How should we calculate L (inductance) value for a transformer

A starting point would be 20 % magnetizing current of your full rated load, in this case 2 VA. At 230 V, that’s 8.6 mA. Z = 2*Pi*L*f. Solve for L. If the transformer would have been 2 kW, about 5 % ...
• 15.7k
Accepted

### Would the primary current of the transformer be zero in the no load condition?

In this model, you are correct. Note that physically, R2, L1 and L2 are the primary. Breaking them out separately is a modeling convenience.
• 4,907
Accepted

### AC Stepdown transformer blown troubleshoot

What would cause a transformer to fail across the primary, from simply switching a breaker off, then back on? It cooled down when the breaker went off then, it warmed up when the breaker was ...
• 465k
Accepted

### Removing DC component from an AC signal

A series-connected capacitor could cancel the DC component and let through the AC component. But without more details about the circuit, I can't say anything more.
Accepted

### Transformer-coupled MOSFET gate drive circuits

However, how does the capacitor reduces the outpus pulse by Vc ? You are feeding a single-ended pulse train (0-VDRV). You can think of this as the sum of a DC offset and an AC pulse train: Since you ...
• 36.4k

### Jacob's Ladder with 2 kV MOT inductance on microcontroller

A) use a longer insulating shaft on the stepper motor B) use a synchronous gear motor, instead of a stepper motor. (you might find such a motor driving the turntable in a microwave oven)
• 34.6k

### How do you choose an audio isolation transformer for a microphone?

Do a search for something like 'microphone transformer data' (without the quotes). A problem is that many of the products are decades old and no longer available. But going through the catalogs and ...
• 21.4k
1 vote
Accepted

### How to Isolate my Power Supply Circuit from Mains?

Yes, that transformer will provide isolation. It is tested as follows (probably for 60 seconds): Hipot: 1500VAC – Input to Output, Input & Output to Core Tranformers sold as "isolation ...
• 408k
1 vote
Accepted

### Magnetising Inductance / Primary Inductance

if the magnetising inductance (which the primary inductance) is defined as 100uH then why it is seperated as 100uH and 10mH on the primary ? This is my question. Without the parasitics, a real-world ...
• 36.4k
1 vote

### Transformer-coupled MOSFET gate drive circuits

First schematic: After few periods the Vc becomes stable at some value Vc. If duty is 50% the primary has equal positive and negative voltage levels. If the duty is different the Vc gets steady at ...
• 1,975
1 vote

### Reusing a salvaged known yellow transformer from a USB charger and using it in H bridge configuration

As long as it's not defective (e.g. shorted wire inside) it can be used for different applications but you need to know all the parameters of the transformer. Measuring winding resistances will not ...
• 36.4k
1 vote

### Can varnish affect the performance of the air gap in an SMPS transformer?

Change of phase of materials often results in change of mass or in this case thickness. Water to ice for instance. If the varnish filling the gap expands on curing you have a new gap size and new ...
1 vote

### What is inside of a typical RF transformer?

They make RF transformers that don't have a cover over them, so you could look at some of those. The covered ones will be the same sort of thing but with a bit of plastic or ceramic around them. There ...
• 25.1k
1 vote

### Determining transformer equivalent circuit components

When you used the values from connecting the impedance analyzer to the secondary, did you account for the turns ratio? You should be using Ls, Lp', and Lm' for those two values, where Lp' and Lm' are ...
• 31
1 vote
Accepted

### Determining transformer equivalent circuit components

Made with Maple ... It seems that there are 4 solutions. The solution where Lm1 and Lm2 (and positive) are "near" should be cared. It is the first in the sequence list where Lm1=79.6 uH and ...
• 14.5k
1 vote
Accepted

### Why is the generator voltage in phase with current?

An ideal transformer, as the term 'ideal' is used here, has infinite magnetizing inductance and zero leakage inductance. As such, there is no phase shift between the primary and secondary, so if the ...
• 35.3k
1 vote

### How does a Current Injection clamp work from a physics persepective?

Although the majority of magnetic flux in a single turn transformer flows through the high permeability core, the so-called "leakage" flux is actually essential to transformer action. The ...
• 25.3k

Only top scored, non community-wiki answers of a minimum length are eligible