Everything for Electronics
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A TRANSFORMER TUTORIAL

Much as we learn about ourselves from our mistakes, we can learn a great deal about transformers from their imperfections.

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Digitally Programmable Potentiometer (DPP) Basics

The digitally-programmable potentiometer (DPP) is a mixed signal, system-level control device performing a component-level function. The potentiometer adds variability to the analog circuit, while the digital controls add programmability. The DPP brings the high speed, programming, computation, and control of a processor to the variation of the potentiometer in a wide array of analog applications.

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Build an ESR Meter for Your Test Bench

Internal resistance within capacitors — known as Equivalent Series Resistance —can increase over time, causing power loss and/or heating. With this device, you can test your stash of capacitors so you can weed out any bad ones before you install them in your projects.

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How to Use a Transistor as a Switch

Whether you need to flash an LED, energize a relay, turn a buzzer or alarm on or off, or invert a voltage level, the NPN transistor switch can easily solve your problem. This article shows you how to use a transistor as a simple SPST switch.

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Oscillators

Every signal begins with an oscillator — In ham radio, the oscillator is a key element in generating signals, mixing them together, and extracting the information from them. Let's see how to make an audio oscillator, plus learn about common RF types.

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RF Oscillators

Previously, we learned what makes an oscillator do what it does, and tried a simple low frequency example. Now, it's time to move up — in frequency — to the oscillators which make the signals that drive the ham's wireless world.

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The Lost Art of Strip Board Prototyping

Many techs of yesteryear built their projects on a breadboard, then would transfer everything to a mirror copper clad board. Here's everything you need to know to use this timeless technique to wire up circuits for prototyping or functional applications.

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