11-01-2021, 10:48 PM
181
Re: Foxy's Latest Project.
Originally Posted by OldGreyFox
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So how is the metal detector coming along? I hear you ask.....I had to make a slight change of direction with the search coil. As with most of my projects, I have to make it up as I go along, some ideas work and others don't. Unfortunately, making the search coil body using 3 disks of 6mm MDF resulted in the 18mm thick body far too robust to work, and too heavy to be wafted about over the terrain for an hour or two.
So after a new design I ended up with this.....The wound coil is supported by a single piece of 6mm MDF and sandwiched between two disks of hardboard and then as much material as possible removed to make it nice and light.
https://mindsetsonline.co.uk/shop/corriflute-3/
It's very light yet rigid, especially if two layers are used with the corrugations at 90 degrees to each other.
11-01-2021, 10:53 PM
182
Re: Foxy's Latest Project.
Another neat job sir.In my former life, changes to existing kit that needed to be modified pronto whilst "out in the field", often with paperwork to follow, a field modification.
Did you modify this in a field, or is it just for use in a field, and will it affect the field current of the search coil?
I'll get my coat.
11-01-2021, 10:56 PM
183
Re: Foxy's Latest Project.
Originally Posted by JBR
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Did you consider Corriflute? https://mindsetsonline.co.uk/shop/corriflute-3/
It's very light yet rigid, especially if two layers are used with the corrugations at 90 degrees to each other.
11-01-2021, 11:00 PM
184
Re: Foxy's Latest Project.
Originally Posted by Fruitcake
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Another neat job sir.In my former life, changes to existing kit that needed to be modified pronto whilst "out in the field", often with paperwork to follow, a field modification.
Did you modify this in a field, or is it just for use in a field, and will it affect the field current of the search coil?
I'll get my coat.
Your sense of humour really appeals to my sense of humour Fruitcake....
Would you describe me as being outstanding in my field....
(with a metal detector)
11-01-2021, 11:17 PM
185
Re: Foxy's Latest Project.
Originally Posted by OldGreyFox
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That sounds just the job JB. Once I have proved that the machine does what it should do, I can go back over and modify the coil and some of the electronics, and even try different methods of winding the coils. Even perhaps adding an amplifier to make it more sensitive.
(Oh, can I have 10% of the treasure please?)
14-01-2021, 09:20 PM
187
Re: Foxy's Latest Project.
Originally Posted by Minx
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So, what’s happened? Is the metal detector up and running as yet? How about a progress pic
At the moment I'm concentrating on the enclosure for the electronics. I've worked out where to situate things like the 'Potentiometer' (the knob that adjusts the sensitivity) the connections for the leads from the search coil, and the power input socket. There is also an on/off switch and an output jack to allow headphones to be attached. As you will appreciate it takes time to decide the most convenient place to place the various controls.
Unlike the search coil construction, it doesn't actually show any progress as each stage is completed, because in order not to damage a completed stage it has to be removed before construction of the next. Only when all stages have been completed can it all be assembled. However, because of you kind enquiry, I will take some pictures tomorrow so you can see what I mean....Thanks again Minx....
14-01-2021, 09:53 PM
188
Re: Foxy's Latest Project.
Originally Posted by OldGreyFox
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Thanks for your inquiry Minx...I'm chuffed to see you in here...At the moment I'm concentrating on the enclosure for the electronics. I've worked out where to situate things like the 'Potentiometer' (the knob that adjusts the sensitivity) the connections for the leads from the search coil, and the power input socket. There is also an on/off switch and an output jack to allow headphones to be attached. As you will appreciate it takes time to decide the most convenient place to place the various controls.
Unlike the search coil construction, it doesn't actually show any progress as each stage is completed, because in order not to damage a completed stage it has to be removed before construction of the next. Only when all stages have been completed can it all be assembled. However, because of you kind enquiry, I will take some pictures tomorrow so you can see what I mean....Thanks again Minx....
Your workmanship is very neat and professional.
Have you decided on an Oscilloscope as yet.
14-01-2021, 10:03 PM
189
Re: Foxy's Latest Project.
Originally Posted by Minx
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So there has been substantial progress. I saw a pic of the Potentiometer a few pages back on this thread so no need for more pics on my account -thanks.Your workmanship is very neat and professional.
Have you decided on an Oscilloscope as yet.
Having not had much experience with an oscilloscope I hope to give it some attention once I have finished the Metal Detector and one or two other projects in the pipeline. I must point out that my workshop is in the loft, and although I have got it insulated, it gets very cold when the temperature drops, so it it's not all that comfortable at times to perform delicate work. Bring on the spring!...
Thanks for your kind complement Minx.....
14-01-2021, 10:35 PM
190
Re: Foxy's Latest Project.
Originally Posted by Besoeker
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OK Foxy.I have a bunch of resistors, mostly 0.5 ohm 5%, a few wire wounds, some ICs, some caps, scope leads. I also have a 100 MHz real time Tektronix oscilloscope and a few 1:1 and 10
robes.I have a clip on current probe. It's a HEME 1000 Ammeter, a fine piece of kit. Probably not a use for you but if you want it that's OK.
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