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Analog Filter Design Demystified - Tutorial Abstract: This article shows how to design analog filters. It starts by covering the fundamentals of filters, goes on to introduce the basic types like Butterworth, Chebyshev, and Bessel, and then guides the reader through the design process for lowpass and highpass filters. Included are the derivation of the equations and the circuit implementation. The best survival guides Like many Americans, I have long been obsessed with the apocalypse. Specifically: surviving it. Generally I exorcise this worry by purchasing wool-wear. But now seems like a critical moment to get my emergency skills in order—some two years into the recession and 22 months from the Earth's collision with Planet X. To say nothing of snowpocalypse.

Circuit Simulator Applet This java applet is an electronic circuit simulator. When the applet starts up you will see an animated schematic of a simple LRC circuit. The green color indicates positive voltage. Resonant inductive coupling Resonant inductive coupling or electrodynamic induction is the near field wireless transmission of electrical energy between two coils that are tuned to resonate at the same frequency. The equipment to do this is sometimes called a resonant or resonance transformer. While many transformers employ resonance, this type has a high Q and is often air cored to avoid 'iron' losses. The two coils may exist as a single piece of equipment or comprise two separate pieces of equipment. Resonant coupling[edit]

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Inflation Calculator: Money’s Real Worth Over Time This inflation calculator uses the Consumer Price Index (CPI) to measure the purchasing power of the U.S. dollar over time. It provides money comparisons from the past to present or any time between. Consumer inflation in the United States increased 2.0% over the 12 months ended April 2019 after rising 1.9% previously, according to the Labor Department’s CPI report released May 10, 2019. Inflation data also shows consumer prices increased 0.3% in April after climbing 0.4 in March.

Electronics Electronic Circuits Also, use the search box at the bottom of the home page. Audio Circuits Audio Amplifier CircuitsDirectional MicrophoneAGC Dynamic MicrophoneVery Low Noise AmplifierInduction Receiver White and Pink (1/F) Noise SourceNoisemaking Circuits (police siren and doorbell chime)

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