Simple Binary-Weighted and R/2R Ladder DAC

A simple 4-bit digital-to-analog converter that is constructed from a digitally controlled switch (74HC4066), a set of binary-weighted resistors, and an operational amplifier. The basic idea is to create an inverting amplifier circuit whose gain is controlled by changing the input resistance Rin. The 74HC4066 and the resistors together act as a digitally controlled Rin…

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Which Remedies For Baldness Work?

WHICH REMEDY FOR BALDNESS WORKS? With each remedy for baldness I have split up into two categories: “drugs” and “natural”. Both remedies for baldness are said to work to a degree. The drugs (creams and pills) have had various clinical trials performed on them, but on the downside they are occasionally susceptible to unwanted side-effects.…

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Discovery in Grassy Cove Saltpeter Cave

On a cool March Friday in 1972, John Wallace checked out his four seat airplane at the Charlie Brown Airport in Atlanta for a flight to Tennessee. The plan was for John’s wife Youlanda, and their children Paul and Erika along with Art Smith, and Jack Pace to drive up to the Cumberland Mountain State…

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Porter’s Five Forces Analysis

If you’ve ever listened to Warren Buffett talk about investing, you’ve heard him mention the idea of a company’s moat. The moat is a simple way of describing a company’s competitive advantages. Company’s with a strong competitive advantage have large moats, and therefore higher profit margins. And investors should always be concerned with profit margins.…

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The Benefits of Ripstop Nylon Fabric

Ripstop nylon fabric is a very popular material because of all of the benefits that are attached to it. This fabric is most popular for the fact that it is very difficult to tear, and since it was first introduced onto the market, people have been using it in a variety of industries around the…

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