Circuits & Schematics: detector - 2

11. Direction detector doubles as decoder
    Tracy Allen
    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 ...
    Feb 1, 2024

12. Simple log-scale audio meter
    Nick Cornford
    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 ...
    Jan 22, 2024

13. Bridge measures small capacitance in presence of large strays
    Jeff Witt
    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 ...
    Dec 18, 2023
14. Force/sense connection eliminates multiplexer on-resistance error
    Stephen Woodward
    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 ...
    Dec 8, 2023
15. Circuit forms satellite-dish command decoder
    Mark Giebler
    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 ...
    Nov 9, 2023
16. Simple night-light uses a photoresistor to detect dusk
    Chau Tran
    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 ...
    Oct 24, 2023
17. A long pulse detector circuit
    Jayapal Ramalingam
    Circuits Analogue Design Signal Processing, Filters Texas Instruments LM393
    .. longer than the set width are to be detected, ignoring the other short pulses. We are familiar with the missing pulse detector circuit, which detects the occurrence of a missing pulse in a pulse train where the pulses are of equal ...
    Oct 17, 2023
18. Circuit's RMS output is linearly proportional to temperature over wide range
    R O Ocaya
    Circuits Measurement Analog Devices LT1001
    .. diode switching response becomes sluggish. Several readout enhancements are possible. For example, connecting a unity-gain detector or precision full-wave rectifier [2] to the filter output allows an output that is positive with ...
    Oct 3, 2023
19. Sine reference is synchronous with ac line
    P Seshanna
    Circuits Analogue Design Supply Texas Instruments LM358
    .. P 1 , P 2 , and P 3 . The circuit steps down and converts the line voltage to a square wave using the IC 1A zero-crossing detector. The integrator block, IC 1B , then integrates the square wave to produce a triangular wave. The ...
    Jul 31, 2023
20. 300 volt, 4 second, self-calibrating Shannon decoder DAC
    Stephen Woodward
    Circuits High Voltage Measurement Microchip LM4040
    .. the backstory. Several years ago, I published a Design Idea ( Ref. 2 ) for an optically isolated ionization pulse detector amplifier. However, the reason why the circuit needed optical isolation in the first place was only ...
    Jul 6, 2023

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