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14W CLASS A AMPLIFIER USING 2N3055 ELECTRONIC DIAGRAM Why Class A ? Because , when biased to class A, the transistors are always turned on, always ready to respond instantaneously to an input signal. Class B and Class AB output stages require a microsecond or more to turn on. The Class A operation permits cleaner operation under the high-current slewing conditions that occur when transient audio signal are fed difficult loads. His amplifier is basically simple, as can be seen from the block diagram.

OPERATIONAL AMPLIFIER OP-AMP OSCILLATOR ELECTRONIC CIRCUIT Timing capacitor (C1) produces several times constants which is used to allow large voltage swings on the input due to the LM101's large input voltage range. The R2 should be reduced and the C1 should be increased to keep from exceeding these ratings. The smaller polarized capacitors is still used by returning them to positive supply voltage instead of ground, even though C1 requires the large values.

ADVANTAGES OF CLASS A PUSH PULL AMPLIFIER → Because of the absence of even harmonics in the output it gives more output per active devices for a given amount of distortion or less distortion for a given output per transistor. → Eliminates Non-linear Distortion, that may arise due to the curvature of transformer magnetization curve. → Lower ripple Voltage DISADVANTAGES OF CLASS A PUSH-PULL AMPLIFIER The drawbacks of push-pull amplifiers are:- → Requirement of two identical or matched transistors. → It need the use of driver stage to furnish two equal and opposite voltages at the input → It requires Bulky and expensive Transformers Back To HOME