Circuits & Schematics: detector

1. A two-wire temperature transmitter using an RTD sensor
   Jayapal Ramalingam
   Circuits Analogue Design Measurement Texas Instruments INA122 LM334 XTR116U CD40106B
   .. struggle, I completed the design of 4 mA to 20 mA, two-wire temperature transmitter using a platinum resistance temperature detector (RTD) sensor, as shown in Figure 1. Figure 1. A two-wire transmitter with a platinum RTD sensor, R4. R1 ...
   Jun 11, 2025

2. Photo tachometer sensor accommodates ambient light
   Stephen Woodward
   Circuits Measurement Texas Instruments TLV9162
   .. passive available-light optical methods are the obvious solution. Unless elaborate lens systems are used in front of the detector, the optical signal is apt to have a relatively low-amplitude due to the tendency of the rotating object ...
   Apr 18, 2025

3. Water-leak detector uses 9V batteries
   Yongping Xia
   Circuits Measurement Analog Devices MAX934
   .. voltage and, as such, it is not that convenient for many applications. This Design Idea describes a portable water-leak detector that uses a common 9 V battery for power (Figure 1). The circuit consumes less than 10 uA during ...
   Apr 18, 2025
4. Metal detector uses single IC
   Rachel Hageman Steve Hageman
   Circuits Measurement National Semiconductor LM389
   .. Figure 1. Beating two frequencies together produces an audible shift in tone when the search coil in this simple metal detector comes near a metal object. The inductance of the search loop and the input capacitance (series ...
   Feb 5, 2025
5. How to collect free energy from atmosphere
   Swagatam Majumdar
   Circuits Bad Prescriptions Supply
   .. keep the circuit closer to an antenna. The proposed free energy collector circuit on the other hand, also acts as a passive detector. As the large metal object passes wave, there is an increase in power. One major usage of this process is ...
   Jan 15, 2025
6. Improved PRTD circuit is product of EDN DI teamwork
   Stephen Woodward
   Circuits Measurement Diodes AP4310A
   .. I published a simple platinum resistance temperature detector (PRTD) design idea ( Reference 1 ) that was largely inspired by a deviously clever earlier DI by Nick ...
   Oct 10, 2024
7. How to build an isolated digital AC dimmer using Arduino
   Hesam Moshiri
   Circuits Arduino Supply NXP BT138-800
   .. points (the points where the wave changes its polarity) are important. To grab these points, we have to use a zero crossing detector. The Figure 2 demonstrates the schematic diagram of the whole circuit. Figure 2. Schematic diagram of the ...
   Apr 26, 2024
8. How to make a noise-free infrared obstacle detection module
   Hesam Moshiri
   Circuits Measurement Robots Vishay TSOP1738KA1
   .. of the sensor to detect the obstacles located near or far from the sensor. Figure 1. Schematic diagram of the IR obstacle detector. According to the TSOP1738 datasheet: “The TSOP17XX series are miniaturized receivers for infrared ...
   Apr 17, 2024
9. Single phase mains cycle skipping controller sans harmonics
   Jayapal Ramalingam
   Circuits Supply Diodes NE555
   .. an adjustable width within 200 ms, by adjusting potentiometer RV1. This pulse train controls an optotriac with zero cross detector U2 ( MOC3033 ) to trigger triac U1 ( BTA25-600BW ). The triac conducts for the duration of “off ...
   Apr 15, 2024
10. Supersized log-scale audio meter
    Nick Cornford
    Circuits Audio Measurement Texas Instruments TL084 LM385
    .. is a logarithmically-squashed version of the input. For now, we only need its positive peaks. A2 and Q1 form a simple peak detector. Whenever A1.OUT is greater than the voltage on C2, A2/Q1 dumps current into C2 until the voltages match. ...
    Mar 21, 2024

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