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Imagine each single-phase transformer has an 'O'-shaped core. When you make a 3-phase, you combine one side of each 'O'. …

In practice, the leakage inductance of the transformer will mean that when one is loaded by the other, the full N* voltage won't appear, and the magnetizing inductance of the 2nd transformer will provide … In addition, winding resistances will become 10* more important in the 1st transformer, causing additional losses. …

Note that with an 'ideal' transformer, the green LED would remain on continuously when the switch is closed, and the red would not light when the switch is opened. … When you begin to add non-idealities to the transformer, behaviour changes. …

A transformer and an inductor are often confused. A transformer for a microwave oven is a combination of an inductor and a transformer. … Your transistor effectively has an inductor in series with its collector (imagine exchanging the positions of the supply and transformer in the circuit -- they are in series and so this has no effect) …

It will work fine -- this is basically the way all systems in your house are connected -- the primaries of the individual transformers are in parallel (i.e. plugged into the mains), and the secondarie …

If it is the transformer, try clamping it -- use a Vise grips to (temporarily) clamp the core tighter, or to clamp the windings tighter. … It may not be the transformer -- ceramic (not electrolytic) capacitors also have some electrostriction characteristics (basically a piezo effect). …

There isn't a 120 Hz component -- it is multiplied by the 20 kHz, thus giving sidebands at 20k + 120 and 20k -120. The CT's limit is core saturation; at lower frequencies, you can't run as high a cur …

You don't actually need a transformer -- a flyback converter (boost DC/DC converter) will work, although you will need a high duty cycle to get 230 V from 12 V at high power. …

This is the transformer-like behavior you mention. An H-bridge is similar, with the motor's windings acting as the inductor. …

You can't supply a signal with a DC component to a transformer. So you can't (shouldn't) apply a 'square wave DC signal' (there's no such thing). … If the source has a DC offset, connect it to the transformer via a capacitor (might need 100's of uF). …

A 'transformer' one will generally only work on 110-120 V (or 220-240 V) and operate at 50 or 60 Hz. … It uses a high frequency transformer (100's of kHz), and some moderately complex electronics to basically 'chop' the mains AC power into smaller chunks and send over the HF transformer (there are many …

An ideal transformer has infinite magnetizing inductance. Therefore with finite voltage applied, if the secondary is open circuit, no current flows. You can't apply I =a.t to an ideal transformer. …

resonant converter, it could be done with reasonable accuracy using a DC sweep (just make one side of the H-bridge 100 % on, and eliminate the core part (2 *20 mH -- connect VL1+ to VL2+ etc.) of the transformer …

It won't matter. The relay will pull in when the applied V reaches 9 V. A higher voltage will make it pull in somewhat faster, but that doesn't matter in most applications. You don't need an 'RC' filt …

They are from leakage inductance in the transformer. You can slow down the mosfet turn-off rate (will severely affect efficiency) or preferably add a clamp ( zener etc) …