Circuits & Schematics: metal detector - 2

11. How to build an isolated digital AC dimmer using Arduino
    Hesam Moshiri
    Circuits Arduino Supply NXP BT138-800
    .. it is used to attach a heatsink) is connected to the Pin-2. It means you should never touch the heatsink or screw it to a metal enclosure! R4, R5, and C2 implement a snubber circuit [1] for the IC2 and C1 and R7 make a snubber circuit [ 1 ...
    .. 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 ...
    Apr 26, 2024

12. How to collect free energy from atmosphere
    Swagatam Majumdar
    Circuits Bad Prescriptions Supply
    .. the output power is achievable through proper set-up of an antenna. Placing an antenna in a close proximity of a large metal object helps generate additional power. The wire of an antenna should be more than 150 feet long, which has to ...
    .. keep the circuit closer to an antenna. The proposed free energy collector circuit on the other hand, also acts as a passive detector. As the large metal object passes wave, there is an increase in power. One major usage of this process is ...
    Jan 15, 2025

13. New 17 foot Wind Turbine. Part 1. Metal Work
    Circuits Wind Energy
    .. and cost effective for people who already have 24, or 48V renewable energy systems in place. Pictured above are most of the metal parts with the exception of the tail boom, tail vane bracket and the piece of pipe that fits between the yaw ...
    Nov 9, 2010
14. Thermostat Uses Capacitive-Sensing Liquid-Metal Thermometer
    Circuits Automation Measurement Microcontrollers Usage
    .. that can solve a difficult sensing problem in a surprisingly simple manner. For example, it can be used to turn a liquid-metal thermometer into the sensing element of a thermostat. Such thermometers are available with maximum temperatures ...
    Mar 23, 2011
15. Simple Lie Detector
    Circuits Medicine Security
    .. a simple lie detector that can be built in a few minutes, but can be incredibly useful when you want to know if someone is ...
    Dec 8, 2007
16. Inexpensive Peak Detector Requires Few Components
    Anthony Smith
    Circuits Analogue Design Texas Instruments TLC372 LM358
    .. no rectifier diodes, the positive peak-detector circuits in figures 1 and 4 exploit the open-drain output of a Texas Instruments TLC372 fast comparator, ...
    Jul 25, 2020
17. IR Detector
    Circuits Domestic
    An IR signal is seen by a reverse biased IR diode which produced an electrical signal according to the light intensity. This signal is then amplified trough a transistor and used to power an ordinary LED. This means that the LED will light up when ...
    Nov 13, 2007
18. Audio Detector
    Circuits Audio
    This circuit is for detecting any audio signal with justable noise offset. It could be used to generate a radio mute signal eg. from a PDA. The circuit is consisting of: Input impedance Signal amplifier Rectifier Justable comparator (Noise offset). ...
    Mar 31, 2008
19. Cheap Sensitive Radiation Detector
    Circuits Security Measurement
    .. project started out as a gag project, a Nuclear War Detector. The idea was to make a device that would flash a little red light if a nuclear attack were underway or ...
    Apr 23, 2008
20. How to build a Geiger counter (radiation detector) with a USB capable microcontroler to connect a PC
    Circuits Security Measurement Microcontrollers Usage
    The Geiger counter is a pretty simple device to detect radiations. Many forms of radiations from radio elements (alpha, beta, gamma) can be detected but it is more sensitive to beta and gamma radiations. The Geiger-Muller tube is a simple device, ...
    Sep 27, 2008

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