Circuits & Schematics: detector - 8

71. Discrete Devices, ICs Improve Inverting Charge-Pump Design
    Tim Davis
    Circuits Supply Power Microchip TС1044S MCP1401T TLE2426
    .. step toward that goal. Figure 1. The inverting charge pump combines a pair of charge-pump ICs with a separate MOSFET-based detector/clock-doubler subcircuit, which in turn enables synchronization and enhances performance. The ...
    Apr 13, 2016

72. Probing system lets you test digital ICs
    Raju Baddi
    Circuits Measurement
    .. is mainly logic zero, with the single 1-msec pulse a logic high. Green indicates the opposite. The LM358 acts as a window-detector logic probe (Figure 1b). With the values in the figure, the red LED lights at Probe B voltages of less ...
    Jul 18, 2013

73. Zero-Cross Detectors Deliver Positive And Negative Triggering
    Peter Demchenko
    Circuits Power
    .. The transistors are off only near zero-ac level where the triac’s triggering may occur. Figure 1. This zero-crossing detector circuit generates the control pulses needed to turn on triacs that require negative pulses for switching. ...
    Oct 30, 2012
74. Easy Pulse: A DIY photoplethysmographic sensor for measuring heart rate. Part 1 - Theory and Schematic
    Circuits Measurement Medicine Microcontrollers Usage
    .. of TCRT100 simplifies the build process of the sensor part of the project as both the infrared light emitter diode and the detector are arranged side by side in a leaded package, thus blocking the surrounding ambient light, which could ...
    Nov 30, 2012
75. PLL filter blocks undesired frequencies
    Circuits Analogue Design
    .. Pin 8, goes low because the output transistor in IC 1 is saturated. The LM567 decoder comprises an inphase and quadrature detector, which a VCO (voltage-controlled oscillator) drives. The VCO determines the decoder’s center ...
    Feb 11, 2013
76. Low-cost RF synthesizer uses generic ICs
    Circuits Digital
    .. 64, 32, 16, and 2 so that the numbers add up to the divisor: 114. The PLL comparator is a three-state phase and frequency detector (Reference 1). When the divided VCO frequency is greater than 10 kHz, the Q output of IC 3B goes high and ...
    Feb 21, 2013
77. Antilog converter linearizes carbon dioxide sensor
    Jordan Dimitrov
    Circuits Security Measurement Hanwei Electronics MG-811
    .. of sensor. References: MG-811 CO 2 Sensor Module AN-30 Log Converters, National Semiconductor (TI) TGS4161 Carbon Dioxide detector
    Aug 19, 2015
78. Ardusumo: an Open Source Platform for Fighting Robots
    Circuits MCU Open-Source Platforms Microcontrollers Usage Robots Arduino
    .. back- and two Sharp infrared radar. Each optical sensor contains a light emitting diode, pointing towards the ground and a detector for reflected light. In this way it can distinguish thanks to light intensity (more light is detected ...
    May 27, 2013
79. A Circuit for Mains Synchronization has Two Separate Outputs for Each Half-Period
    Dusan Ponikvar
    Circuits Measurement 2N3904 1N4148
    .. are vertically shifted for bet- ter visibility. REFERENCES “DIY: Isolated high-quality mains voltage zero-crossing detector,” www.dextrel.net/ diyzerocrosser.htm. Matteini, Luca, “Mains-driven zero-crossing detector ...
    Sep 12, 2013
80. A Simple Method to Accurately Predict PLL Reference Spur Levels Due to Leakage Current
    Circuits Wireless Measurement Application Notes Linear Technology LTC6945
    .. generating an LO signal. The PLL integrated circuit (IC) usually contains all clock dividers (R and N), phase/ frequency detector (PFD) and the charge pump, represented by the two current sources, ICP_UP and ICP_DN. The VCO output is ...
    Dec 29, 2013

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