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Why do you need a Matching Transformer The most understandable explanation.

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ElectronicsClub

Published on Mar 2, 2021

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The article discusses why a matching transformer is needed in audio amplifiers. A matching transformer is used to match the output impedance of the amplifier with the impedance of the speaker. Such amplifiers are assembled on a transistor connected according to a common emitter circuit in order to obtain maximum output power. However, the resistance of the common emitter cascade is significantly higher than the speaker resistance, which does not allow transmitting high power from the amplifier to the speaker. If the speaker is connected directly to the transistor collector circuit, then when setting the operating point, a significant current will flow in the collector circuit. As a result, such an audio amplifier circuit will have a fairly low efficiency, that is, most of the energy coming from the power source will be wasted. In order to transmit maximum power from the amplifier to the speaker, and this is possible when their resistances are equal, a matching transformer is used. The primary winding of the transformer has a resistance equal to the output impedance of the amplifier, and the secondary winding has a resistance equal to the impedance of the speaker. Links to materials on transistor amplifiers, including impedance matching. I recommend watching in order, starting with the video on the first link. 1. Transistor amplifier. Part one: • How a TRANSISTOR really works Do it yourself ... 2. Transistor amplifier. Part two: • Transistor amplifier Assemble an amplifi... 3. Transistor amplifier. Part three: • DIY audio POWER AMPLIFIER ... 4. Transistor amplifier. Part four: • Microphone amplifier Assemble an amplifi... 5. Transistor amplifier. Part five: • RESISTANCE MATCHING Assemble an ... 6. Transistor amplifier. Part six: • OUTPUT POWER AMPLIFIER Collect ... Electronic component kits for experiments of beginner electronics engineers: Get a high DISCOUNT on the purchase of ALL products: http://ali.pub/3mwkwb Breadboard: http://ali.pub/3mtvcu Convenient breadboard: http://ali.pub/3mtvyt Serious breadboard: http://ali.pub/3mtx4m Flexible jumpers for breadboard: http://ali.pub/3mtxj0 Jumpers in a pencil case 14 types 140 pieces: http://ali.pub/3mtxtw Set of resistors 600 pieces, 30 denominations of 20 pieces: http://ali.pub/3muaey Set of transistors: http://ali.pub/3muc1h Buy a good multimeter: RM113D http://ali.pub/3mn1ru Buy a simple multimeter: DT830B http://ali.pub/3mn8qo Digital dual-channel signal generator DDS: http://ali.pub/4c2hf7 Serious digital signal generator UNI-T UTG962: http://ali.pub/4c2hx3 Oscilloscope Hantek DSO5202P: http://ali.pub/3rey34 Soldering iron with adjustable temperature CXG 936d: http://ali.pub/4c2kuh #transformer #amplifier #electronicsclub

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