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How does a comparator circuit in an op amp work?
The comparator circuit work by simply taking two analog input signals, comparing them and then produce the logical output high “1” or low “0“. By applying the analog signal to the comparator + input called “non-inverting” and – input called “inverting“, the comparator circuit will compare this two analog signals,
How are op-amps used in a heartbeat sensor?
HRM-2511E heartbeat sensor has 4 op-amps. The fourth Opamp is used as a voltage comparator. The analog PPG signal is fed to the positive input and the negative input is tied to a reference voltage (VR). The magnitude of VR can be set anywhere between 0 and Vcc through potentiometer P2 (shown above).
How does a simple burglar alarm circuit work?
A simple burglar security alarm is here using the IR transmitter, IR receiver, and an LM358 op-amp for home purposes. In this burglar security alarm circuit, the cathode of the IR transmitter is connected to the positive supply while the anode to the ground supply through a resistor of 150 Ω.
How does The LM358 work in a burglar alarm?
In this burglar security alarm, LM358 op-amp IC is configured as a comparator in this project. When the whole system is turned on, the IR transmitter starts to emit infrared rays. These infrared rays fall on the surface of the IR receiver.
How are phase comparators used in a circuit?
Integrating Type Phase Comparator with Rectifier Bridge and Gate: Such a phase comparator has the advantage of simplicity and economy. The circuit is illustrated in Fig. 3.21 (a). It consists of a rectifier phase comparator followed by a polarity detection circuit, R-C charging circuit and a level detector.
What is the operating principle of a comparator?
The operating principle of this type, of the comparator, is based on the laws of light reflection and refraction. The magnification system depends on the tilting of a mirror, deflects a beam of light, thus providing an optical lever.
How is the VR of a comparator circuit set?
The analog PPG signal is fed to the positive input and the negative input is tied to a reference voltage (VR). The magnitude of VR can be set anywhere between 0 and Vcc through potentiometer P2 (shown above). Every time the PPG pulse wave exceeds the threshold voltage VR, the output of the comparator goes high.