Circuits & Schematics: detector - 3

21. Zero-bias detector yields high sensitivity with nanopower consumption
    Mitchell Lee
    Circuits Wireless Analog Devices LTC1540
    .. battery life. A better method involves a technique borrowed from simple field-strength meters: a tuned circuit and a diode detector. Figure 1 shows the complete circuit, which was tested for proof-of-concept at 445 MHz. This circuit ...
    May 23, 2023

22. Phase-sequence indicator uses few passive components
    Metodi Iliev
    Circuits Measurement Supply
    .. R 7 limit forward currents through the LEDs. For greater sensitivity, you can replace the LEDs with high-input-impedance ac-detector circuits. The circuit's final version includes indicators that show whether all three phases carry ...
    Apr 3, 2023

23. Using a MOSFET as a thermostatic heater
    Peter Demchenko
    Circuits Automation Diodes TL431
    .. diode charges the capacitor C1 through the Schottky diode D3; as a matter of fact, these components create an envelope detector. (This part of the circuit can also be interpreted as an S/H circuit.) The thing is, the typical direct ...
    Mar 30, 2023
24. Low-power, super-regenerative receiver targets 433-MHz ISM band
    Cedric Mélange Jan Vandewege Johan Bauwelinck
    Circuits Radio Analog Devices ADCMP371
    .. systems, automobile alarms, biomedical monitors, sensor networks, and computer peripherals. A super-regenerative detector can also demodulate frequency-modulated signals through slope detection. Tune the detector so that the ...
    Mar 1, 2023
25. Platinum-RTD-based circuit provides high performance with few components
    Jordan Dimitrov
    Circuits Analogue Design Measurement Texas Instruments OP07C
    .. standard way of using an RTD (resistance-temperature-detector) sensor is to include it in a bridge followed by a differential amplifier. The problem is that two ...
    Feb 15, 2023
26. Detect wire breaks with unusual CMOS gate circuit
    Raju Baddi
    Circuits Measurement Texas Instruments CD4050B CD4069UB CD40106B
    .. memory cell, we shall explore a way of detecting such a break. In Figure 2a, the broken wire forms a capacitance with a detector cylinder of length 1-3 cm through which the wire passes, and charges the input capacitance (C I ~10 pF) ...
    Jan 8, 2023
27. Dual comparators stabilize proximity detector
    Arthur Harrison Joseph Stern
    Circuits Measurement Maxim MAX406ACPA MAX912
    .. the proximity detector of Figure 1, a 4-in.-sq piece of copper-plated pc board serves as an antenna that forms one plate of a ...
    Dec 29, 2022
28. Oscillating Output Improves System Security
    Ana Gómez Jorge Marcos
    Circuits Automation Security Vishay IRFD110
    .. the low-frequency dynamic variable from the PLC. To accomplish that task, you must use an external oscillator and a pulse detector implemented with a monostable multivibrator. The oscillator produces a square-wave signal of a frequency ...
    Dec 19, 2022
29. Solenoid Trip Circuit Works at Battery's End of Life
    Brad Peeters
    Circuits Supply Texas Instruments LP339 TLE2426
    .. Design Idea involves a low-power motion-detector circuit that operates from battery power for extended times. Part of the design includes a ...
    Dec 12, 2022
30. Simple Continuity Tester Fits into Shirt Pocket
    Tom Wason
    Circuits Measurement Central Semiconductor 2N5087 2N5089
    .. than 100 Ω. Unfortunately, a continuity tester may create noise currents that feed back into the sensitive Q 1 /Q 2 detector. Three circuit features minimize that noise. First, capacitor C 2 connects across the buzzer. Second, ...
    Dec 9, 2022

Sort by: relevance / date