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By G. D. Bishop (auth.)

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C. input signal is injected with T1 as an input current. c. c. c. input signal. The coupling methods may be summarised as follows. c. I 1 load 1 line : I IX 0 (1) RC coupling: low cost, small, simple to design but low frequencies affected. Used for general low-power amplifiers up to radio frequencies. c. signals not possible, such as servo signals and computer logic signals. (2) Direct coupling: no cost, circuitry simple but sometimes difficult to design. c.. Very high output powers are also possible, with negligible losses in capacitors or transformers.

Signals- the impedance between them often being a few ohms. 10 is of a high-impedance-matching circuit with a FET input and a bipolar output, capable of supplying current that the FET cannot. The use of ann-channel MOSFET (depletion type) and a pnp transistor allows direct connection, and so avoids the need for series-isolating capacitors. 1lb. c. resistance, and so produce vertical load lines on output characteristics. For this reason, transformer coupling produces a high current output with very small voltage output, and is useful for driving lowimpedance loads such as motors, loudspeakers and relays.

C. cycle, only the positive half-cycles being amplified; this is termed class B operation. (3) With R 1 set to provide VBE = 565 mV, the transistor is cut off for a portion of the negative half-cycle, that is, when the input voltage falls below 560 mV; this is termed class AB operation. ss C operation. The voltages shown are merely examples of typical bias voltages; they can have any values which conform to the definitions given earlier; for instance, class AB operation will exist for any bias voltage of between 560 m Vand 570 m V, 565 mV being just one typical example.

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