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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 …

The key point is that an ignition coil is a transformer, not just an inductor. While these are composed of similar elements, a transformer has coupling between the 2 windings. … Consequently, the secondary V will rise (until the current actually flows), and this will induce a (transformer) voltage in the primary with a factor of N_primary/N_secondary of the secondary voltage. …

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) …

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 …

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 …

The transformer primary current will be quite small if there is no load on the secondary (high voltage) end. Therefore it is sufficient (and much safer) to monitor the primary (120 V) current. …

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). …

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. …

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. …

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. …

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

When you apply a (changing) current to a coil (inductor), a (changing) magnetic field is generated and this induces a voltage in the coil. Ultimately this voltage will interact with the circuit that i …

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 …

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. …