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Electrical Noise

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An unshielded twisted pair.

Noise is a hassle in just about everything and in electronics and electrical circuits it is no less of a concern. However, it is something we can handle with some planning and if that fails a little knowledge will get us a long way to figure out a “work around”

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No new posts for a week.

Instead of continuing to create posts about theory, I need to spend the time doing the construction of the thermistor circuit and the popsicle crane. Work has been proceeding, but at a snails pace. Since the goal of this site is to present projects all the way from conception through execution I need to get

Continue reading No new posts for a week.

How a transformer is constructed.

The dead transformer.

The joke among electrical folks is it does not work on electrons and all the theory stuff. I actually uses smoke, because when you let the smoke out of it, it stops working. A few weeks ago I posted this picture of a transformer that “smoked” as soon as power was

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Bigger is not always Better – Filter Capacitors for Power Supplies

A filter capacitor to smooth a half-wave rectifier.

This is a rewrite of the previous post. I had two problems with the previous post. First, I miscalculated the Diode resistance by a factor of 10 and second, I did not put the full load on the power-supply. Ripple is going to look a lot

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Two wrongs do not make a right.

Well here I am on the World Wide Web admitting it…. I screwed up! Not once but twice.

I was preparing for tonight’s post and noticed the current draw was not enough. I had miscalculated the load. I had put some resistors in series when it should have been parallel. Once I fixed that problem,

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Three is right for me.

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Three blades rotated a random amount.

Three sounds like a strange number, but it turns out to be the perfectly balanced number when considering spinning objects. Most electricity is used to spin motors and almost all of it is generated by spinning alternators. Three phase is very common in electricity. Three blades are often

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We need to straighten things out… We need to rectify this situation.

A half-wave rectifier

Most electronics and some other things require DC electricity, but AC is what we usually have available. AC is great for the power companies because they can use a transformer and step up the voltage and transmit the power long distances and then use another transformer to step it back down

Continue reading We need to straighten things out… We need to rectify this situation.

Magic Crystals and Magic Potions …. no just a real diode.

This post has been corrected – Somehow I managed to calculate the resistance of the diode and moved the decimal point.

The Symbol for a Diode

In last night’s post I got us to the point where a PN junction was formed on a single pure silicon crystal by doping one part of it

Continue reading Magic Crystals and Magic Potions …. no just a real diode.

The Chemistry of Semiconductors.

The Symbol for a Diode

It is time to start moving from passive to active. No I am not talking politics here, I am talking about our study of electronics. Passive devices are devices that do not require external power. Active devices require external power. To me a better set of terms to use

Continue reading The Chemistry of Semiconductors.