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    Induced current in a coil

    If I have a coil of suitable configuration and I pass a magnetized needle over it (NOT through it) as close as poss - would that induce a current/voltage in the coil? if so could that current/voltage be "amplified" to be used as an input to an Arduino board? This is a great forum and I am...
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    Audio files on a chip

    Hi all, As ever - this is great forum, a big thank you that make it possible, My project is for an educational device made up of a board with pointing arrow that moves along and when it reaches an object it plays an audio file, then next object the same and so on ... up to about 10 objects. am...
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    Capacitor with Multi-dielectric

    Hi All, I hope you good people can enlighten me on this, I find capacitors fascinating, the more I find out about them the more questions arise, Lets say I have a basic capacitor with two conductive parallel plates, inbetween them I have multi-layer dielectrics of different types...
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    Electrolyte-less Capacitor

    Hi all, Having two parallel conductive plates with a separator inbetween with NO electrolyte whatsoever, can they function as a capacitor? if so how about voltage? thanks
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    Capacitance measurements and frequency

    In various research papers I came across - it seems capacitance is always measured as a function of "frequency"? why is that? would that be needed even if one is dealing only with DC current? thanks.
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    ID a circuit please

    Hi All, I found this circuit at a Garage sale, can you please see if you can tell what it does? In addition to the components you can id from the pics there are: :: a rectifier KBU6D (the black rectangle nxt to the fuses) :: Film capacitor 0.33/250 :: 3 x caps 1000uF/63V Many thanks
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    Capacitor with conductive metal inbetween plates

    Hi, As always this is great forum, I am learning great deal here :) I am thinking about making a simple capacitor, made up of: 1. Conductive parallel plates - lets say they are made of Aluminium 2. An insulator made up of two layers, can be anything - lets say paper 3. A very thin metal sheet...
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    Angular parallel plates capacitor

    Hi, I hope you good people can enlighten me on this, Parallel plates capacitor charge and/or capacitance calculations are well known, suppose one take a rectangular shaped capacitor and bend it 90 degrees into an "L" shaped capacitor. What effect that will have on capacitance and/or charge of...
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    Please help with info about a HOT-WIRE Supply kit

    Hi All, Great forum thanks to all that made it possible, I helped with a house clearance after the owner passed away, Along with fair bit of electronics components such as resistors, caps etc I came across a piece of equipment called " HOT-WIRE SUPPLY BY KEYBURN SYSTEMS", Google search...
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    Please Please Help Me Understand This ...

    Hi All, Great forum, thank you to all who made it possible, I conducted a simple experiment but I not able to understand/explain the results, In large bowl full of material composed mostly of: FINE SAND + WATER + SALT(natural unrefined) probably in equal parts which made it look like a paste...
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    Salty ground voltage

    Hi all, I hope - you clever people can enlighten me on strange phenomenon I observed today ... In a small patch of salty wet ground I stuck two rods, copper and Aluminium, no matter the distance the voltage reading was always 0.6V, the copper side being the +. Can someone please explain what...
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    Cooling Fan blowing the fuse

    Hi All, I hope you clever people can help me with my problem, On my car I changed the clutch fan with an electric one, the fan is wired through a 40Amps Relay, everything works ok for a while then the fuse just melts away! I used fuses as high as 30Amps! The fan motor is ok, the relay has...
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    Corrosion resistant electrodes

    Hi All, I hope you can help me with my quest, I need advice about corrosion-resistant materials to use as electrodes for a form of a capacitor that uses saline brine electrolyte - am not able to change the electrolyte so that is why I need to source the electrodes that will cope with the...
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    supercapcacitor based battery

    Hi all; Please excuse me if my question appear basic; If I am to make a super dupper large capacitor that is able to hold a lot of charge (using graphene for example); 1) is there any way I can prevent it from self discharging; I dont mind a small amount of self disharging 2) how can I use the...
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    Turning supercapacitors into batteries

    Hi All, I have been pondering this for a while ... If once can make or buy a very beefy supercap say few 100farads, 1. can one treat a supercap with that much storage cap as a battery? 2. if so what circuit can be used to allow the SC to be used as a battery for prolonged discharge thanks for...
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