Operational Amplifier or OpAmp is a DC coupled amplifier with differential inputs and usually with a single output. An OpAmp can deliver an output voltage hundreds or thousand times greater than the voltage difference between its inputs. OpAmps may be single, dual, quad etc. In single OpAmps only one OpAmp is present while in dual type two OpAmps with separate inputs and outputs are present. In quad OpAmp, four OpAmps are present in the single package. Some of the OpAmps like CA3130, CA3140, TL0 71, LM311 etc have excellent performance with very low input current and voltage.
Op Amp LM 311 is capable of driving DTL, RTL, TTL, or MOS logic circuits etc. The output can switch voltages to 50 volts at currents to 50 mA. IC LM311 operates between 5 and 30 volts single supply so it can be used to drive Relays, Lamps, Solenoids etc. Compared to other general purpose Op Amps, the pin connection of LM311 is different.
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