Re: Foxy's Latest Project.
Originally Posted by
Fruitcake
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I don't recognise any of that kit except the moving needle meter.
Your enclosure looks very neat.
The purpose built oscillator looks fascinating.
We had a whole design department that would produce drawings for something like that, then another department would make it.
We used all sorts of instrumentation connectors from single pin to about 200 pin plug and socket affairs.
When ordering parts it always seemed to me that the smaller the component, the longer the part number.
I'm guessing that somehow you will be able to set up and calibrate the system to discriminate between different types of metal.
My Dad used to be able to work out what some objects were by the sound they made when he went metal detecting.
Blip-blip was an upturned bottle cap, bzt, was a coin on edge, buzz was a coin lying flat, bzt-buzz was a ring pull (not so prevelant now). Something with a high iron content would be louder because it was more dense than aluminium or coins.
Most of the equipment is continuity testers and signal injectors Fruitcake.
The analogue meter is a home rolled battery tester with a facility for testing NPN and PNP transistors. It can also calibrate high voltage output (low current) up to and including 20,000 volts when working with spark generators.
The traffic lights is just a project that interested me at the time....
The project on the left of picture is a homemade light beam based on a laser, I was going to set it up across the drive but was disappointed with the results so I intend to turn it into something else. The drive is now protected by a PIR.
I'm not sure if the metal detector will discriminate until I have tested it in the field...