Encyclopedia of Electronic Components Volume 2: Diodes, by Charles Platt

By Charles Platt

Need to know tips on how to use an digital part? This moment e-book of a three-volume set comprises key info on electronics elements on your projects—complete with pictures, schematics, and diagrams. You’ll study what every one does, the way it works, why it’s precious, and what editions exist. regardless of how a lot you recognize approximately electronics, you’ll locate interesting information you’ve by no means stumble upon before.

Perfect for academics, hobbyists, engineers, and scholars of every age, this reference places trustworthy, fact-checked details correct at your fingertips—whether you’re clean your reminiscence or exploring an element for the 1st time. newbies will fast take hold of very important suggestions, and more matured clients will locate the explicit information their initiatives require.

Volume 2 covers sign processing, together with diodes, transistors, chips, mild, warmth, and sound emitters.

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Additional info for Encyclopedia of Electronic Components Volume 2: Diodes, Transistors, Chips, Light, Heat, and Sound Emitters

Sample text

The flow now ceases. Thus, the only way to end a flow of current that has been 2 discrete semiconductor > thyristor > SCR initiated through an SCR is by reducing the flow or attempting to reverse it. Note that the self-sustaining flow is a function of current rather than voltage. Unlike a transistor, an SCR is either “on” or “off” and does not function as a current amplifier. Like a diode, it is designed to conduct current in one direction; hence the term rectifier in its full name. When it has been triggered, the impedance between its anode and cathode is sufficiently low that heat dissipation can be managed even at high power levels.

If P1 is slowly moved toward the center of its range, the current diminishes, ceasing when it falls below the holding level. If P1 is now moved back to the top of its range, the current will not resume until the triac is retriggered with the pushbutton. The test can be repeated with P1 at the top of its range and P2 at the bottom of its range, to operate the triac in quadrant 2; P1 at the bottom of its range and P2 at the bottom of its range, to operate the triac in quadrant 3; and P1 at the bottom of its range and P2 at the top of its range, to operate the triac in quadrant 4.

An SSR functions as a SPST switch, and is available in normally open or normally closed versions. SSRs that function as an SPDT switch are relatively unusual and actually contain more than one SSR. No single schematic symbol has been adopted to represent a solid-state relay, but some alternatives are shown in Figure 4-1: Top An unusually detailed depiction of an SSR that switches DC current using MOSFETS. Symbols for this device often omit the diodes on the output side and may simplify the MOSFET symbols.

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