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Questions tagged [metal]

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27 views

Possible IB metal detector schematic

What do you think about this schematic? I guess it should work, although it wouldn't be very stable (±2-3 Hz according to the Falstad simulator). It was adapted, from the Matchless Metal Detector ...
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1answer
40 views

VLSI channel routing: Why only route through channels?

I know that after placement you have your blocks and channels between the blocks. Now, the routing only takes place in the channels. My question is: Why can't we just route 'over' the blocks by ...
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1answer
85 views

Advice for a 2.4 Ghz antenna placement

I have circuit demanding a 2.4Ghz antenna inside a metal enclosure. I cannot place it on the external casing since the case it's movable and will also be exposed to other issues. I need some advice ...
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0answers
636 views

Metal Detector using IC 555 Timer project

I want to build some project about metal detector using integrated circuit 555 timer. I already made a schematic in proteus 8 application. I made some change with the original schematic i found on ...
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3answers
66 views

Is there any sense in carrying assembled enclosed electronics in a static-shielding bag?

Say I have a Raspberry Pi enclosed in a metal case, such as this: Would it offer any additional level protection if I put it in a static-shielding antistatic bag whenever I carry it around (e.g. ...
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3answers
266 views

Why is it important, in terms of ESD protection, to ground a PCB to its case (if not insulative)?

I have a 12V DC-powered SBC to mount inside a metal case. How important is it that I connect its ground(?) to the metal case on the interior? How is this going to protect against ESD events? From my ...
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1answer
58 views

Warming up metal plate safely [closed]

I want to design a riddle: 1. 12 metal plates on the wall 2. 8 plates at room temperature. 3. 4 plates at 40-45 Celcius(104-113 Fahrenheit), it is important the plate doesn't exceed the temperature ...
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2answers
2k views

PI Metal Detector Amplification Circuit

I've been research metal detector designs for a few days now and I can't quite wrap my head around the amplification they are using for the first stage right out of the coil. Below is an example ...
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2answers
287 views

Sensing human touch or proximity to large metal pipe

Suppose one has a large metal pipe made of mild steel approximately 6-feet tall and 8-inches in diameter. Suppose this pipe has an regular pattern of perforations on its surface. Imagine the pipe is ...
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2answers
106 views

High power LED on aluminium core PCB

I'm working with a high power LED(40W heat dissipation) on a single layer aluminium core PCB.To calculate the required heatsink it did the following: \$P = 40W\$ \$Rjc = 0.6K/W\$ (datasheet) \$...
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2answers
67 views

How to find the Lithium Contents of a Metal Battery, by knwing only the VOLTS

How do we find the Lithium Contents of a Metal Battery, when the Batteries show only the VOLTS. As per the IATA DGR, Metal Batteries can be accepted only when the Lithium contents are known ; but ...
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2answers
930 views

Why is there often a metal clip around a dc motor [duplicate]

I have seen many DC motors with a piece of sheet metal that is bent and snaps onto the motor casing. What is its purpose? Is it an additional cooling body? Or maybe to concentrate the magnetic field ...
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1answer
182 views

Metal detecting using a small inductance

I have a coil with approximate indutance of 15uH used to detect metal through changes in inductance. I want to use an op amp or 555 to oscillate with frequency based on the inductance. However this ...
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6answers
149 views

Recommendation for metal finding method

I will start by explaining the problem to make my question clear. During the production of diapers , the machine need continuous supplying material. So Butt Splicer is used to attached the end of ...
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2answers
108 views

Detecting and counting metal plates

I need to detect and count a number of metal plates coming by my sensor. I need to do it cheap as possible. There are around 1-2 centimeters between the plates, and they are 3 centimers thick. The ...
1
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1answer
339 views

Induction loop detector

I am trying to create an induction loop detector by following this http://www.allaboutcircuits.com/projects/metal-detector-with-arduino/ but apparently something is wrong on my side or I missed ...
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1answer
33 views

Difference in conductivities of metals and semiconductors based on quantum theory

According to Fermi-Dirac statistics, in a metal, only certain number of valence electrons take part in conduction when they acquire an energy equivalent to KT for some temperature. Now my questions is:...
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4answers
1k views

Free Electron in Current

An electric current is a flow of free electrons. Are these free electrons totally free from the orbits of metal atom or they moving by jumping from one orbit to another orbit of the atoms? If they ...
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1answer
157 views

How are metal leads on through hole parts made?

For example, consider a TO-92 packaged part: How is one of its leads manufactured? Can they be customized?
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2answers
49 views

Would the electrical circuitry of an immersion heater be affected if taken out of the water immediately after switching off?

I have an immersion heater like this: and the tiny instruction manual says "Please keep the heater in the water for a minute or two after switching off the current" ...but they haven't ...
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1answer
275 views

Battery powered, wearable, non line of sight, short range metal detector?

I want to build a circuit to detect when people bring their hands close to their mouth. This could be used to warn chronic nail biters of impending nail biting for example :) The idea I have is that ...
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1answer
92 views

Pic24f microcontrller often restarts when placed in metal box

I have developed a vehicle tracking application , everything works fine nothing wrong in wrong condition. I want to check out the signal strength of the modem so i placed the modem in a Metal box , a ...
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1answer
3k views

What are USB Connectors made of?

What type of metal are the tips of USB connectors/plugs typically made from? Aluminium? I've noticed they will often, quite-easily, oxidise/rust/corrode.
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2answers
407 views

Detecting metal, detecting a coil - which is easier?

This is a metal detector question, with one assumption. That is, the detecting is done by eddy currents in the target changing the resonant frequency of the detecting coil. The question then becomes, ...
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2answers
2k views

capacitive switch behind a mirror (silver backing)

I am new to this field, and I would like to DIY a mirror with a hidden capacitive \inductive touch sensor behind it, once touched it will turn on a 12V LED light. I have bought a capacitive switch ...
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1answer
427 views

how to make a electric steam vapourizer at home

I want to make a durable electric steam vapourizer ( basically used to inhale steam to give comfort for nasal block and also facial steaming). I have bought quite few from the market and i see it goes ...
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1answer
933 views

How to calculate the current rating of different metal part (copper and brass) used inside a switch/socket/plug?

How to calculate the current ration of different metal parts normally used in household electrical appliance product like switch, socket, plug etc. How do i know that, the parts i have chosen that is ...
0
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1answer
65 views

Metal Effect on Trace Impedance and Ground

I am working on a project that will have some impedance controlled traces running next to a large metal plate grounded at 1 point. I wanted to confirm that: 1) The metal plate will still impact the ...
2
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1answer
376 views

Metal detector with plastic covering

I've been looking at a metal detection circuit. As I understand, it depends on changes in the magnetic field in a coil: when metal comes close from the coil, the circuit can detect that metal is ...
3
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1answer
4k views

Parameters of a metal detector coil

I built metal detector called MiniPulse Plus (it is a kit. comes with calibration instructions but says nothing about the coil, except that it should be between 300-500uH). A circuit sends a pulse ...
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4answers
307 views

Cutting off metal anchor legs on an HDMI port or Metal connector? What to use?

I'm looking for some advice on how to cut an HDMI port anchor leg off using some type of miniature cutting wheel. I bought a dentist micro drill, but I'm unsure which type of burs to purchase and type ...
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1answer
278 views

Grounding Plexiglass

I have a sheet of plexiglass that has metal strips (Aluminum) that will be connected through wires to an Arduino. The Arduino is grounded but the metal strips are not. The metal strips will rest on ...
5
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1answer
652 views

Any simple short range metal detector?

I'm looking for a simple short range metal detector. I've looked everywhere and I can find only complex metal detectors circuits to find metal at several cms of distance, most over 60cm, they are an ...