Circuits & Schematics: metal detector - 4

31. LED doubles as emitter and detector
    Circuits OSRAM SFH409
    Kyle Holland EDN Every junction diode exhibits some degree of photosensitivity when it receives light comprising an appropriate range of wavelengths. The spectral response of a junction diode depends on a variety of factors, including material ...
    Apr 5, 2017

32. Mains-driven zero-crossing detector uses only a few high-voltage parts
    Peter Demchenko
    Circuits Power
    .. mains voltage is approximately 0V, thereby dissipating only 200 mW at 230V and a 50-Hz input. Figure 1. This zero-crossing detector uses low-voltage parts and consumes little power. The circuit charges capacitor C 1 up to the limit that ...
    Apr 17, 2012

33. Garage Door Opener Parts Form IR Intrusion Detector
    Bert Henscheid
    Circuits Security Texas Instruments LM555C
    .. creating an infrared beam intrusion detector system, the need for a beam-focusing method became evident. Parts from a modified Genie garage door ...
    Dec 21, 2016
34. Low-component-count zero-crossing detector is low power
    Carlos Castro-Miguens José Benito Castro-Miguens M Pérez Suárez
    Circuits Analogue Design Avago Technologies HCPL-4701
    .. be easily modified so that it produces a falling-edge waveform that is synchronized with V AC . Figure 1. The zero-crossing detector uses few components and consumes very little power. The V O signal has a rising edge that is coincident ...
    Jul 12, 2017
35. Regulator IC forms convenient overvoltage detector
    Robert Bell
    Circuits Supply Texas Instruments TL431 TLV431
    .. 1 shows a simple, stand-alone overvoltage detector. The intent of the circuit is to monitor a voltage, V MON , and set the output, V OUT , high when the ...
    Nov 7, 2018
36. Make a truly linear RF-power detector
    Circuits Analogue Design Measurement Analog Devices AD633 AD707 AD8361
    .. dynamic range, but are not rms-responding. An alternative solution (Figure 1) uses the AD8361, a high-frequency true-power detector. Unlike the logarithmic amplifier, the AD8361 is an rms-to-dc converter and, therefore, responds to the ...
    Sep 13, 2020
37. Sampling Peak Detector has Shutdown Feature
    Shyam Tiwari
    Circuits Measurement Signal Processing, Filters Maxim MAX4231
    .. face a serious problem in using a slow ADC with a fast peak detector. The circuit in Figure 1 allows a slow ADC to measure a fast, sampled signal peak. The 100-MHz peak ...
    Apr 5, 2022
38. Switched-gain op amp serves as phase detector or mixer
    W Bruce Warren
    Circuits Analogue Design Analog Devices AD8041
    .. multiplexing. In addition to this multiplexing, you can also use the disable function to configure the op amp as a phase detector or a frequency mixer. Figure 1 shows how the disable function can implement a low-frequency phase ...
    Jun 16, 2022
39. Circuit Combines DC High-Voltage Drop Detector, Undervoltage Alarm
    Shyam Tiwari
    Circuits Supply Texas Instruments LMC555
    .. that prevents the system from working properly, causing severe air pollution. Figure 1. As shown, the dc high-voltage drop detector/undervoltage alarm uses an LED for a visible indication, but the LMC555/TLC555 can also be connected to a ...
    Jul 12, 2022
40. Circuit Forms Gamma-Photon Detector
    Bruce Denmark
    Circuits Measurement Maxim MAX4477 MAX987
    .. The most critical component is the PIN photodiode, whose selection often involves conflicting considerations. Detector sensitivity (the number of photons detected for a given radiation field), for example, depends on the ...
    Jul 18, 2022

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