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220V live Wire-in-Wall scanner - This little circuit will help you to scan
line of a 220V live wire in wall. FET gate is connected to a capacitive
metal sensor (which is usually a simple metal plate). When you hold sensor close
to wall, LED will indicate current flow around where it detects
wire. Works on 9VDC. (added 4/05) |
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A Metal Detector for Pin Pointing - Preliminary ArticleMore to come
later....(design added 12/08) |
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A Simple BFO Metal Detector - A Very Simple "Beat Frequency Oscillator" type of
Metal Detector. These are about the Simplest of all Metal Detector types, But still
quite useful for many Detecting applications. And although this one is particularly
simple, I find it works very well. For use outside on the ground the coil "MUST have a
Faraday Shield", or it will not be of any use because of Ground Effects. |
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Beat Balance Metal Detector - Various embodiments of the BB metal detector have
been published, and it has been widely described in the press as a new genre. Instead
of using a search and a reference oscillator as with BFO, or Tx and Rx coils as with
IB, it uses two transmitters or search oscillators with IB-style coil overlap. The
frequencies of the two oscillators are then mixed in similar fashion to BFO, to
produce....(electronic design added 6/07) |
CCO Metal Detector - To the best of the author's knowledge, the metal detector
shown here represents another new genre. It is presented here merely as an
experimental idea, and operates in conjunction with a Medium Wave radio.
…(added 07/05) |
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Coil Coupled Operation Metal Detector - (electronic design added 6/07) |
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Metal Detecto based on the CS209Now Discontinued. - Especially Suited to find
studs in Walls. Note: this IC is discontinued and getting hard to
obtain....(electronic schematic added 12/08) |
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Metal Detector (Andy Collinson) - A variable power supply with adjustable voltage
and current outputs made with the L200 regulator. (electronic schematic /
circuit added 4/02) |
Metal detector (Andy Collison) - A single chip metal detecor with a range of a few
inches. This is useful for decting nails or screws in walls and floors, or for
locating buried mains cable.
(electronic design added 11/06) |
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Metal detector (tomzi.geo) - A reasonably effective bfo (bifilar oscillator). Its
performance is not comparable to more advanced commercial products, of course, but it
still works. Anyway, during WWII metal detectors based on the same principle were
utilized my combat engineers of many armies to clear mines.....(added 10/05) |
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Metal Detector based on the TDA0161 - Preliminary Circuit Article...More Info to
Come....(circuit design added 12/08) |
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Metal Detector for Pin Pointing - Preliminary ArticleMore to come later....(design
added 12/08) |
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Metal detector Mk1 - A fun metal detector to find coins at the beach… (circuit
added 05/07) |
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Metal detector Mk2 - More sophisticated 5 transistor metal detector (BC547, BC557,
BC338) (electronic schematic added 05/07) |
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Metal Detector uses Single IC - 12/12/97 EDN-Design Ideas: (design idea added
3/03) |
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Metal Detector-A Pulse Induction Detector. Pulse-1 - Hundreds of this Detector
have been built with Very favourable Feedback....(electronic schematic added 12/08) |
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Metal Detector-Pulse-2 Induction Type Detector - This is a Revised Version of the
Pulse-1 above with Additional. Controls for More Flexibility. This Project
is Definately Not Recommended for the Beginner....(circuit design added 12/08) |
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My Metal Detector Coil Jig - Not a ProjectBut this is how I make the Flat
Coils....(design added 12/08) |
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New CCO Metal Detector - Thomas Scarborough has designed a new embodiment of the
CCO (Coil Coupled Operation) metal detector, a new genre which I invented in 2004. I
believe that this is the first IC design to appear on the Internet (there is a
transistor design on many websites, and IC designs were published by Elektor and EPE).
It took me just eight minutes to design this -- which illustrates the simplicity of
the principle. OBSERVATION: On the surface of it, it may look like an IB (Induction
Balance) detector -- but it is not. It works on the principle of the transformer
coupled oscillator (TCO), and requires an... |
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Simple BFO metal detector - A Very Simple "Beat Frequency Oscillator" type of
Metal Detector. These are about the Simplest of all Metal Detector types, But still
quite useful for many Detecting applications. And although this one is particularly
simple, I find it works very well.....(electronic design added 05/08) |
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Simple metal detector Electronic circuit - (electronic circuit added 4/05) |
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Testing Metal Detector Coils - ….(electronic schematic added 12/08) |
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Two-component metal detector - The circuit shown must represent the limits of
simplicity for a metal detector. It uses a single 4093 quad Schmitt NAND IC and a
search coil -- and of course a switch and batteries. A lead from IC1d pin 11 needs to
be attached to a MW radio aerial, or should be wrapped around the radio. If the radio
has a BFO switch, switch this ON. Since an inductor....(electronic design added 11/06) |
