It is known for its good audio characteristics. It is basically a dual high input impedance JFET op-amp.
One of them is connected as a buffer, and the other is connected as a low-pass filter. The op-amp used in this circuit is called the TL072 dual BIFET op-amp IC.
The circuit is basically a low pass filter whose pass frequency lies between 60 hertz and 160 hertz. This circuit finds a lot of applications in the use of automobile subwoofers. The op-amp used here is the LM833 IC, which is basically a dual op-amp that is designed for audio purposes. These two signals are further amplified separately and is bi-amped to its corresponding low frequency and high frequency bands. The circuit divides the complex audio signal into two bands, one being the low frequency signal, and the other being the low frequency signal. They are known to be more suitable for HiFi audio systems. All the drawbacks that the passive circuit has is rectified by this circuit. This circuit can be considered just the opposite of the passive tone control circuit. This circuit does have some disadvantages like energy wastage, and high distortion. The Baxandall circuit principles and the whole circuit is explained in detail in the original article. The circuit is divided into two parts – the op-amp based pre-amplifier and the Baxandall tone control circuitry. Thus, the circuit got its name as Passive Tone Control Circuit. The circuit uses op-amp as the only active element, whereas all the other components are passive elements. When an intruder walks by, the LM 1458 op-amp senses the difference in phase and automatically goes high. The beams produced by the IR diode are received by a photo-transistor. A 555 timer IC is also used here to work as an astable multivibrator. This circuit is used to produce an alarm as soon as an intruder walks across the infrared rays produced by an IR diode. You will find it very useful in checking the sound pressure of each channel on different positions of the room. The op-amp is connected as a non-inverting amplifier, and can be easily setup as a sound level checker at homes and theatres. The flip-flop IC used here is the IC CD4027. The third op-amp inside the IC is used as a level detector. Two op-amps from the chip are selected and are used to amplify the sound picked by the condenser microphone. This circuit is used to toggle the output pins status of a flip-flop IC, using a sound. The circuit is highly stable and is also known to produce a reasonable output of 12 Watts on a 4 Ohm speaker. The op-amp produces the gain required and the transistors are connected to work as the speaker driver. Only one uA741 op-amp and four transistors are required for the working of this circuit. This circuit is very simple and inexpensive. Read more about the working of the circuit from the link above. A 555 timer IC is also used to be triggered by a transistor and thus to drive the alarm load. As soon as the shadow falls on it, the resistance of the device begins to increase. The main use of the LDR is to sense the presence of a person through his shadow falling on the sensor. In this circuit, apart from the 741 op-amp IC, a Light Dependent Resistor (LDR) is also used. We have given a very detailed description and circuit diagram for every one of the. Most of them are simple and easy to make a home. Given below are some links to some of the best op-amp based circuits designed by us. The different pin assignments of the 741 IC are also explained with neat figures. The article also contains information about the 741 IC, its packaging style, the use of op-amp as an inverting and non-inverting circuit, and so on. The different advantages of op-amps are also specified, along with links to different basic op-amp circuits like Comparator Circuit, Schmitt Trigger Circuit, Astable Multivibrator, Monostable Multivibrator, Zero-crossing detector, voltage splitter and so on. The above linked article contains all the basics of op-amps, with the basic op-amp circuit with two transistors. To learn about it click on the link – Operational Amplifiers (Op-amps) We have classified this list into three parts:-īefore going into detail about the different op-amp application circuits, it is important to know about the basics of op-amp, and the small applications of the IC.