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A basic, single transistor amplifier differs from an op amp:

1. The op amp has more gain

2. The op amp may have higher input resistance (so it loads the circuit less)

3. The op amp may have a lower output resistance (so it can drive larger currents)

4. The op amp likely has a lower frequency response (due to the high gain, unless you provide some sort of feedback loop)

5. The op amp is ridiculously complex compared to a simple amplifier

6. The op amp will require a positive and negative voltage (may be unnecessary with a single transistor amplifier)

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14y ago

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