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Balanced and Unbalanced Loads and Lines A balanced load is one whose terminals can be reversed without significantly affecting circuit behavior A plain resistor is a good example The two-wire antenna input in a television receiver is another example of a balanced load A balanced transmission line is usually a two-wire line, such as oldfashioned TV ribbon, also called twinlead An unbalanced load is a load that must be connected a certain way Switching its leads will result in improper circuit operation In this sense, an unbalanced load is a little like a polarized component such as a battery or capacitor Many wireless antennas are of this type Usually, unbalanced sources and loads have one side connected to ground The coaxial input of a television receiver is unbalanced; the shield (braid) of the cable is grounded An unbalanced transmission line is usually a coaxial line, such as you find in a cable television system Normally, you cannot connect an unbalanced line to a balanced load, or a balanced line to an unbalanced load, and expect good performance But a transformer can allow for mating between these two types of systems In Fig 18-10A, a balanced-to-unbalanced transformer is shown Note that the balanced side is center-tapped, and the tap is grounded In Fig 18-10B, an unbalanced-tobalanced transformer is illustrated Again, the balanced side has a grounded center tap The turns ratio of a balanced-to-unbalanced transformer (also called a balun) or an unbalancedto-balanced transformer (also known as an unbal) can be 1:1, but this need not be the case, and often it is not If the impedances of the balanced and unbalanced parts of the systems are the same, then a 1:1 turns ratio is ideal But if the impedances differ, the turns ratio should be such that the impedances are matched Shortly, we ll see how the turns ratio of a transformer can be manipulated to transform one purely resistive impedance into another Transformer Coupling Transformers are sometimes used between amplifier stages in electronic equipment where a large amplification factor is needed There are other methods of coupling from one amplifier stage to another, but transformers offer some advantages, especially in RF receivers and transmitters Part of the problem in getting a radio to work is that the amplifiers must operate in a stable manner If there is too much feedback, a series of amplifiers will oscillate, and this will severely degrade the performance of the radio Transformers that minimize the capacitance between the amplifier stages, while still transferring the desired signals, can help to prevent this oscillation.

Again, quite a bit has been written about connection pooling. This is one of the most common areas of concern, especially for ASP.NET applications, and I ve written my share of articles and blog entries. When you understand how the mechanism works, you ll understand how to keep it working. These are the basic functions: When the SqlConnection.Open method passes a connection string to SqlClient, the provider looks for a matching connection pool. Each pool is uniquely identified by its connection string.

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Each AppDomain or Process gets its own pool. This means other ASP.NET applications get their own pool(s). Each transaction scope gets its own pool. An application can have as many pools as necessary just change the connection string. Since ADO.NET 2.0, developers have been able to clear a specific pool or all pools owned by the AppDomain or Process. When the SqlConnection.Open method is called, either a new pool is created, or an existing pool is reused. If the pool exists, the provider attempts to find and use a dormant (unused) connection in the pool. Otherwise, a new connection to SQL Server is established and its handle is placed in the pool. If a dormant connection is found, the connection state is cleared (by default) so the new owner inherits a clean connection state identical to the state when it was first opened. As more requests for connections are passed to the provider, the process is repeated until the number of pooled connections reaches an upper limit. The default is 100 connections. When the Connection.Close method is called, the connection is marked as dormant and reusable. The connection is then placed in the pool, ready for reuse. No attempt is made to clean out the connection state until the connection is reused. If a connected application fails in a way that forces the connection to be closed, the pooled connection is dropped. In some cases, all connections in the pool are dropped when an error occurs. If the server cannot be accessed for whatever reason or the AppDomain or Process ends, the pool is flushed and dropped. If a pooled connection is not reused after 4 to 8 minutes, it is closed and dropped from the pool until there are Min Pool Size connections left.

significant figures, is 89 The circuit contains an almost pure inductive reactance, because the phase angle is close to 90 The resistance contributes little to the behavior of this RL circuit at 10 MHz

Connection pools are created on the client, not on the server. When debugging applications with Visual Studio, you ll notice that Visual Studio owns the connection pools. This means connections might be held for some time if the application under development does not properly close the connection (as often happens). Eventually, you ll overflow the pool or exhaust the number of connections permitted by the SQL Server configuration.