Circuits & Schematics: detector

1. How to build an isolated digital AC dimmer using Arduino
   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 ...
   26-04-2024

2. How to make a noise-free infrared obstacle detection module
   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 ...
   17-04-2024

3. Single phase mains cycle skipping controller sans harmonics
   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 ...
   15-04-2024
4. Supersized log-scale audio meter
   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. ...
   21-03-2024
5. Direction detector doubles as decoder
   Circuits Measurement Beginners Digital Texas Instruments CD4093B
   Fig 1’s circuit, which was developed to monitor the traffic of bumblebees into and out of the hive, differentiates “a-to-b” motion from “b-to-a” motion. When used with an optical decoder, the circuit distinguishes ...
   01-02-2024
6. Simple log-scale audio meter
   Circuits Audio Measurement Texas Instruments TL081
   .. sketched in Figure 1, shows the first pass at the idea, and avoids those disadvantages. Figure 1. This basic peak log detector shows the principals involved and helps to highlight the problems. (Assume split, non-critical supply ...
   22-01-2024
7. Bridge measures small capacitance in presence of large strays
   Circuits Measurement Analog Devices LT1004 LT1413 LT1462 LTC1043
   .. capacitances, especially if the sensor is remotely placed. I needed to make measurements with a 50 pF cryogenic fluid level detector, with only 2 pF full-scale change, hooked to several hundred pF of varying cable capacitance. This ...
   18-12-2023
8. Force/sense connection eliminates multiplexer on-resistance error
   Circuits Amplifiers Analog Devices LT1028
   .. high-performance bias and preamplifier circuit for a cryogenic (liquid-nitrogen-cooled), mercury-cadmium-telluride infrared detector. These broadband, photoconductive optical sensors are popular in IR spectrometers. They are particularly ...
   08-12-2023
9. Circuit forms satellite-dish command decoder
   Circuits Signal Processing, Filters Microcontrollers Usage TV
   .. eliminates the need for external memory. The only external components are a few discrete devices for the signal detector and the coaxial-cable loop-through (Figure 2). You can add an RS-232 driver if you want to display the ...
   09-11-2023
10. Simple night-light uses a photoresistor to detect dusk
    Circuits Automation Beginners Light Analog Devices AD8214
    .. can use an LDR in a circuit that detects darkness and turns on an LED (Figure 2). The circuit uses a high-voltage threshold-detector IC that features a current output and operates as a comparator. The LDR and potentiometer R 3 form one ...
    24-10-2023

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