CircuitsToday.com is listing some of the best op-amp circuits present in our sites. There are more than 20 circuits which show the different applications of the op-amp. We are listing the links of our best 15 circuits with detailed descriptions and circuit diagrams. Do not forget to go through the comments section for each post, from where you will get ideas about how to modify the circuit. Also if you have any doubts, feel free to ask them through comments. Before 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.
The above linked article contains all the basics of op-amps, with the basic op-amp circuit with two transistors. 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 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 pin assignments of the 741 IC are also explained with neat figures. Given below are some links to some of the best op-amp based circuits designed by us. Most of them are simple and easy to make a home. We have given a very detailed description and circuit diagram for every one of the
Sensitive Intruder Alarm Circuit
In this circuit, apart from the 741 op-amp IC, a Light Dependent Resistor (LDR) is also used. The main use of the LDR is to sense the presence of a person through his shadow falling on the sensor. As soon as the shadow falls on it, the resistance of the device begins to increase. A 555 timer IC is also used to be triggered by a transistor and thus to drive the alarm load. Read more about the working of the circuit from the link above.
Transistor Amplifier Circuit-12 Watts
This circuit is very simple and inexpensive. Only one uA741 op-amp and four transistors are required for the working of this circuit. The op-amp produces the gain required and the transistors are connected to work as the speaker driver. The circuit is highly stable and is also known to produce a reasonable output of 12 Watts on a 4 Ohm speaker.