The TL071 is from the JFET-input op-amp family and is designed as a low-noise version through low input bias, fast slew rate & offset currents. These op-amps are a type of analog ICs that utilize JFETs or junction-field-effect transistors as the i/p stage. These are used in different applications which include active filters, amplifier circuits, signal conditioning & oscillator circuits. This article provides brief information on the TL071 op-amp, pin configuration, specifications, and its applications.
What is TL071 Op-Amp?
The TL071 op-amps are the next-generation industry-standard version devices. These op-amps offer outstanding value mainly for cost-sensitive applications, with different features like; high slew rate, low offset, integrated RF and EMI filters, high ESD capacity & common-mode i/p to the positive (+ve) supply. The TL071 IC is a high-speed JFET i/p single op-amp that includes high-voltage JFET, well-suited, and bipolar transistors within a monolithic IC. This op-amp is available in different packages thus it is essential to select the most suitable one for your required application.
The pin configuration of the TL071 op-amp is shown below. This IC includes 8 pins and each pin’s functionality is discussed below.
Pin-1 (Offset N1): It is offset Null1.
Pin-2 (IN–): It is an inverting i/p of the first op-amp.
Pin-3 (IN+): It is a noninverting i/p of the first op-amp.
Pin-4 (VCC-): It is a negative or GND pin.
Pin-5 (Offset N2): It is offset Null2.
Pin-6 (OUT): It is an inverting i/p of the second op-amp.
Pin-7 (VCC+): It is an o/p pin of the second op-am.
Pin-8 (NC): It is a no connection pin/ no connection by the inner circuit of the chip.
Features & Specifications:
The features and specifications of TL071 op-amp include the following.
- Amplifier type is J-FET.
- The mount type is through the hole.
- The technology used is Bipolar.
- This TL071 op-amp includes 8 pins.
- The package or case is 8-DIP.
- The nominal current supply is 2.5mA.
- CMRR or common mode rejection ratio is 70 dB.
- This op-amp has 20 V/μs of high slew rate.
- It has 2 μV/°C of low offset voltage drift.
- It has 1 mV of low offset voltage.
- Its common-mode i/p voltage range has VCC+.
- It has low noise typically (Vn) is 18 nV/√Hz at f = 1 kHz/
- It has low offset and input bias currents.
- It has low total harmonic distortion typically 0.003%.
- This op-amp has protection of o/p short-circuit.
- It has less power consumption typically 940 μA/ch.
- Its Height x Length x Width is 3.3mm x 9.27mm x 6.35mm.
- Its bandwidth is 4MHz.
- Its i/p offset voltage is 10mV.
- Its input bias current is 20pA.
- Its o/p current for each channel is 40mA
- Its wide voltage supply ranges from ± 2.25 V to ± 20 V & ± 4.5 V to ± 40 V.
- Equivalent TL071 op-amps are; TL072, Tl074, LM358, LM324, LM741C, LM709C, MC1439,
LM201 and LM748.
Microphone (Mic) Preamplifier Circuit with TL071 Op-Amp
The low noise and high quality based microphone or mic preamplifier circuit with TL071 op-amp is shown below. At present, the major challenges faced by the designers of audio amplification are filtration of noise & power consumption. So JFET i/p op-amps are used to meet all these requirements.
This circuit is designed with TL071 JFET i/p op-amp IC. The input biasing current of JFET is nearly small which results in an extremely low current noise. This IC is suitable within the pre-amplification phase due to low THD (total harmonic distortion), low noise, and low power consumption.
The required components to make this simple circuit mainly include; TL071 op-amp IC, two resistors; 10KΩ & 62KΩ, capacitors; 1μF, 10μF & 47μF, ± 12V power supply, microphone, connecting wires, and a breadboard. Connect the circuit as per the circuit shown below.
This mic preamplifier circuit works with a 9-12V voltage range. This circuit uses a microphone, so by replacing an electret microphone through a different audio source can be utilized for the instrument pre-amplification sounds, sound cards & audio mixing desks. The microphone of this circuit is biased with a 10k ohm resistor. Here the resistor range mainly depends on the voltage supply, microphone current & operating voltage.
Whenever the 1uF capacitor’s impedance within the circuit is very low as compared with the 10k ohm resistor, then the AC current can be supplied to the TL071 IC. In addition, the 1uF capacitor allows only the microphone’s AC component to supply or block the DC component.
There is an amplified AC voltage at the TL071 IC. At the output of TL071 op amp, there will be amplified AC voltages with 4.5Volts DC in case of a 9V supply & 6V in case of a 12V supply. Here, the amplified AC voltage is changed by connecting a potentiometer op-amp’s negative feedback. At last, the 10uF capacitor passes only AC voltages to be received out of the audio.
- This circuit is the best choice for mainly an audio recording pre-amplification.
- This circuit is worked through a single battery source, so it is suitable for electronic sound cards.
- This circuit is used in different musical instruments for low-noise pre-amplification.
- This mic preamplifier circuit is a significant part of the oscilloscope’s pre-amplification stage, DJ mixers & live music.
The advantages of TL071 op-amp include the following.
- TL071 op-amp has less power consumption.
- It has wide common-mode & differential voltage ranges.
- It has less input bias & also offset currents.
- It has an o/p short circuit shield
- It has less total harmonic distortion (THD) typically 0.003%.
- These op-amps have high input impedance.
- These are fairly resistant to changes in input offset voltage.
- This op-amp has frequency compensation internally.
- It has a latch-up-free operation.
- It has low i/p bias & offset current.
The applications of the TL071 op amp include the following.
- TL071 op-amp is used for audio pre-amplification, ECG, medical instrumentation, Weigh scales, etc.
- These TL071 op-amps are used in audio recording because of their low noise.
- This IC is suited ideally for audio pre-amplifier & high-fidelity applications due to low noise & low harmonic distortion.
- These are used in single-phase and three-phase UPS.
- These op-amps are used in audio mixers and battery test equipment.
- These are used in servo drive control & power stage modules.
- These types of amplifiers are used in fast D/A converters, high-speed integrators, and sample and hold circuits that need low input bias current, low input offset voltage, high slew rate, broad bandwidth & high input impedance.
- These ICs are applicable in audio, telephony, wireless, military, digital control, optical networking, video, and imaging.
- These are ideal for audio preamplifier & high-fidelity applications.
Please refer to this link for the TL072 Op Amp.
Please refer to this link for the TL071 Op-Amp Datasheet.
So far we have seen the features of this op-amp but we also need to know what factors need to consider before choosing an op- amp. Refer to this link to know more on – How to choose an op-amp?
Thus, this is an overview of TL071 JFET-input op-amp which is designed as a low-noise versions through low input bias, fast slew rate & offset currents. These ICs are applicable in high-fidelity & audio pre-amplifier-based applications due to low noise & harmonic distortion. Every amplifier has JFET inputs connected with bipolar o/p stages incorporated on a single monolithic IC. Here is a question for you, what is TL073 IC?