There are four ways to classify operational amplifiers:

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Ideal op amps use no power, have infinite input impedance, unlimited gain-bandwidth and slew rate, no input bias current, and no input offset. They have unlimited voltage compliance.

• Voltage amplifiers take voltage in and produce a voltage at the output.
• Current amplifiers receive a current input and produce a current output.
• Transconductance amplifiers convert a voltage input to a current output.

Operational amplifier: The ideal op amp is an amplifier with infinite input impedance, infinite open-loop gain, zero output impedance, infinite bandwidth, and zero noise. It has positive and negative inputs which allow circuits that use feedback to achieve a wide range of functions.

An operational amplifier is an integrated circuit that can amplify weak electric signals. An operational amplifier has two input pins and one output pin. Its basic role is to amplify and output the voltage difference between the two input pins.

Advantages: increased circuit stability, ▪ increased input impedance, ▪ decreased output impedance, increased frequency bandwidth at constant gain.

Op-amp stands for operational amplifier. It is available in IC (Integrated Circuit) chip. Originally, op-amps were so named because they were used to model the basic mathematical operations of addition, subtraction, integration, differentiation, etc. in electronic analog computers.

Transistor Amplifiers:

• Voltage Amplifiers: These are most common amplifiers used in the electronic devices.
• Current Amplifiers:
• Power Amplifiers:
• Audio Frequency Amplifiers (A.F.
• Intermediate Frequency Amplifiers (I.F.
• Radio Frequency Amplifiers (R.F.
• Ultrasonic Amplifiers:
• Wideband Amplifiers:

Class “A” amplifiers are considered the best class of amplifier design due mainly to their excellent linearity, high gain and low signal distortion levels when designed correctly.

class D amplifier

Class D amps, also known as “digital” amplifiers, work by shifting the sample frequency at which they operate up to extremely high frequencies. In doing so, they use MUCH smaller power transformers which takes up far less interior space—something that is always at a premium in subwoofers.

So the more often the swings take place, the more opportunity for waste. Even so, the efficiency of a practical Class-D amplifier can be better than 90 percent, which is significantly better than a Class-AB design (78.5 percent at best and typically closer to 50 percent).

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Well, just prove: when the amp delivers more than the speaker you’ll risk crashes… but this is not your case absolutely !! P.S. Could you hear something? Your amp needs to have more wattage than your speakers, otherwise you risk blowing both.