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For practical applications, there are two broad types of switching devices available: semiconductor and mechanical. Semiconductor devices include a few different types of transistors, optocouplers, and solid state relays (SSRs); mechanical devices come down to different types of relays. Solid state devices are often physically smaller, consume less power, and are able to switch more rapidly than mechanical devices because there are no moving parts. The lack of moving parts nominally makes semiconductors more reliable, but well-designed relay circuits will often last just as long. Only certain classes of semiconductor devices provide electrical isolation between input and output. Some solid state devices are a little trickier to use and less forgiving if used incorrectly. Mechanical switching devices have the advantages of providing electrical isolation, being pretty bulletproof to design with, and are easily understood. On the downside, they tend to need higher drive currents and so can themselves need additional circuitry to be driven from the Arduino. They are also limited in switching frequency. This latter limitation can manifest as either being unable to switch fast enough to support higher frequencies or wearing out too quickly limited number of cycles. As a rule of thumb, switching frequencies of 1Hz or faster for any continually operated circuit with a mechanical relay is marginal at best. Having discussed some of the general issues in selecting output circuits, we now look at some practical examples.

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c# - Create PDF preview - Code Review Stack Exchange
I have written the following GetPDFPreview() method. It open a PDF file, create a thumbnail (using PdfDocument class) and returns the result.

Each method of the class uses either SecurityCallContext or ContextUtil to obtain information about the current caller and return it. A C# client to use this class and display the results looks like this: using System; using System.Runtime.InteropServices; using DniScSecurityChecks; namespace ScSecurityChecks { class Program { static void Main(string[] args) { try { ISecuredMethods obj = new DniScSecurityChecksObj(); bool isSecurityEnabled = obj.IsSecurityEnabled(); Console.WriteLine( "IsSecurityEnabled: {0}", isSecurityEnabled); isSecurityEnabled = obj.IsSecurityEnabledAlt(); Console.WriteLine( "IsSecurityEnabledAlt: {0}",isSecurityEnabled); bool isInRole = obj.ManualSecurityCheck(); Console.WriteLine( "ManualSecurityCheck: {0}", isInRole); isInRole = obj.ManualSecurityCheckAlt(); Console.WriteLine( "ManualSecurityCheckAlt: {0}", isInRole); string caller = obj.GetCaller(); Console.WriteLine( "GetCaller: {0}", caller); } catch (Exception e) { Console.WriteLine( "Exception: {0}", e.Message); } Console.Read(); } } }

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c# make thumbnail of pdf

Reed relays consist of a switching element (the reed ) within a coil of wire. When current flows through the energized coil, the resulting magnetic field closes or, in some cases, opens the contacts. If the switch is open when the coil is off, the relay is said to be Normally Open or NO. If the switch is closed then the device is Normally Closed or NC. Some reed relays have both NC and NO contacts. The construction of the relay provides a high degree of electrical isolation, but because the contacts within the reed are quite small, the contacts have limited current- and voltage-handling capability. However, the small size of the contacts has an upside: only quite small currents (typically under 15mA) are needed to keep the coil energized and the contacts closed. Reed relays commonly have coil voltages designed to be compatible with 5V digital circuitry, and so in many cases can be driven directly by the Arduino. Figure 16-5 is a schematic of a reed relay connected in this manner.

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