Circuits & Schematics: detector - 2

11. Energy Leak Detector
    Circuits Domestic Measurement
    .. around doors and windows that cause energy leaks but can be used in many other ways, when a sensitive temperature change detector is needed. Two LEDs are used to signal if the temperature change is pointing above (Red LED) or below ...
    Jul 21, 2009

12. First-event detector has automatic-reset function
    Circuits Domestic Games
    Use this circuit to tell which game player presses a button first. Vasil Borodai The circuit in Figure 1 lets you indicate which game player presses a button first. Each button has a corresponding LED that indicates the pressing of the button. All ...
    Aug 6, 2009

13. Precision Peak Detector Uses No Precision Components
    Jim McLucas
    Circuits LM306
    .. you need a precision peak detector, you would usually implement it with one or several op amps and a few other associated components. This ...
    Dec 20, 2009
14. Room Noise Detector
    Circuits Security Measurement
    One LED monitors three levels: 50, 70 85 dB Useful to detect too noisy environments Circuit diagram: Parts: R1 10K 1/4W Resistor R2, R3 22K 1/4W Resistors R4 100K 1/4W Resistor R5, R9, R10 56K 1/4W Resistors R6 5K6 1/4W Resistor R7 560R 1/4W ...
    Apr 5, 2010
15. Motion detector alarm
    Circuits Security
    .. Mohankumar This motion detector alarm circuit can detect a moving person from a distance of 1 meter. It uses a Dual IR ...
    Sep 21, 2010
16. 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
17. Live-line Detector
    Circuits Measurement CD4017
    Detects the presence of a live mains conductor Minimum parts counting Circuit diagram: Parts: C1 100nF 63V Polyester or Ceramic Capacitor D1 Red LED (any type) IC1 4017 Decade counter with 10 decoded outputs IC P1 SPST Pushbutton B1 3V Battery (two ...
    Apr 4, 2010
18. AC Power Current detector Circuit with LM1458
    Circuits Measurement Power
    This circuit will detect power line currents of 250 mA or more without making electrical connections to the line. Current is detected by passing a line of alternating current through an inductive pickup (L1) as a screen diameter of 1 inch U-bolt ...
    Dec 5, 2010
19. 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
20. 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

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