Circuits & Schematics: detector - 8

71. Photodetector sorts objects
    Circuits Measurement NXP ICM7555
    .. wave; thus, a filter can remove optical noise. You normally need filtering when light shines through fans onto the optical detector. When required, you can place a bandpass filter in series with Q 3 's output. Figure 1. An oscillator ...
    Nov 8, 2019

72. Energy Scavenging for Remote Sensors
    Circuits Supply Texas Instruments LM385 LPV511 LPV7215
    .. during the sensor off periods. In this example, a solar cell and a one-farad capacitor are used to power a remote motion-detector that uses an RF link to transmit the occurrence of any moment to a central monitor. This type of sensor ...
    Apr 29, 2019

73. Add a signal-strength display to an FM-receiver IC
    Circuits Wireless Measurement NXP TDA7000
    .. because the IF signal is centered on 70 kHz. The voltage at Pin 12 is dc-coupled to an amplifier, IC 2 . Next, an envelope detector, IC 3 , yields a dc voltage proportional to the received-signal strength. The TCA965 window ...
    Dec 13, 2018
74. Use Inexpensive Components To Create An Infrared Close-Object Alert Circuit
    T.K. Hareendran
    Circuits Automation Measurement Robots Texas Instruments LM555 CD4060B
    .. through resistor R1, and the LED inside the opto sensor is illuminated continuously. The LM555 (IC1) is wired as a light detector plus medium-current inverting line driver. Usually, its output (pin 3) is low. The value of sensitivity ...
    Dec 10, 2018
75. Regulator IC forms convenient overvoltage detector
    Robert Bell
    Circuits Supply Texas Instruments TL431 TLV431
    .. 1 shows a simple, stand-alone overvoltage detector. The intent of the circuit is to monitor a voltage, V MON , and set the output, V OUT , high when the ...
    Nov 7, 2018
76. Two wires control SPI high-speed ADC
    Circuits Interfaces Microcontrollers Usage Texas Instruments ADS7816
    .. the process. When the clock line initially goes low, it also asserts /CS to a low state. The time constant of the peak detector comprising D 1 , R 1 , and C 1 ensures that /CS does not go high until the clock line remains high for ...
    Feb 22, 2018
77. Add Simple Temperature Monitoring To Battery-Management Systems
    Tim Regan
    Circuits Automotive Analogue Design Measurement Power Linear Technology LT6001 LTC6802
    .. with the LTC6802 include an accurate thermistor-based sensor for SOC calculations (Fig. 1) and a simple diode-based hotspot detector (Fig. 2). а) b) Figure 2. A simple diode array hotspot temperature sensor is formed using the LTC6802 ...
    Jan 23, 2018
78. Energy Harvester Produces Power from Local Environment, Eliminating Batteries in Wireless Sensors
    Circuits Supply Linear Technology LTC3588-1
    .. all the critical power management functions: a low loss bridge rectifier, a high efficiency buck regulator, a low bias UVLO detector that turns the buck converter on and off, and a PGOOD status signal to wake up the microcontroller when ...
    Nov 29, 2017
79. Low-cost RF sniffer finds 2.4-GHz sources
    Circuits Wireless Measurement Linear Technology LT5534
    .. in the 2.4- to 2.5-GHz frequency band. At the circuit's heart, a Linear Technology general-purpose LT5534 RF-power detector, IC 1 , measures RF-signal strengths from 55 to 5 dBm and provides an RSSI ...
    Nov 15, 2017
80. Low-component-count zero-crossing detector is low power
    Carlos Castro-Miguens José Benito Castro-Miguens M Pérez Suárez
    Circuits Analogue Design Avago Technologies HCPL-4701
    .. be easily modified so that it produces a falling-edge waveform that is synchronized with V AC . Figure 1. The zero-crossing detector uses few components and consumes very little power. The V O signal has a rising edge that is coincident ...
    Jul 12, 2017

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