Automax V4 Mod

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	Re: Automax V4 Mod « Reply #10 on: September 26, 2009, 06:14:32 pm »

Thanks guys for sticking up for the little guy. LOL man this is why I dislike forums so much that put morons in charge

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	Re: Automax V4 Mod « Reply #11 on: September 27, 2009, 02:23:50 am »

	Quote:	Posted by bountyhunter
Thanks guys for sticking up for the little guy. LOL man this is why I dislike forums so much that put morons in charge

I did look. You were very unclear as to what you were doing with the cord from the CB radio. If you don't get that, there's little hope you will understand why it didn't work. End of story. Let me know when you really want some help rather than an excuse.

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	Re: Automax V4 Mod « Reply #12 on: September 27, 2009, 04:39:20 am »

	Quote:	Posted by bountyhunter
Thanks guys for sticking up for the little guy. LOL man this is why I dislike forums so much that put morons in charge

Whoa! You are BOTH wrong.... I can see the problem but I do not think there is an easy solution!

While you both were yelling your heads off, I was looking and the drawing confirms it, more or less.

The problem is, you removed a sensitive part from the circuit where short wires are essential, in doing so, you added capacitance and a smaller amount of inductance, to the circuit, it is out of balance and just might not work.

Having said that, if the coil goes directly to a semiconductor (transistor, FET) it is possible you might put part of it into the working end, with the coil. If that is out, use a simple BFO circuit on a small board, in the pointer and power it through the cable.... any AF can go up the cable to other circuitry.

Goldigger1950 is always short fused.... like a drop of nitro, on an anvil.... drop a hammer on it and watch it fly through the wall (I have seen it.) So both of you should reconsider your hasty words, after all, this medium is not the best way to convey information.

goldigger

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	Re: Automax V4 Mod « Reply #13 on: September 27, 2009, 04:48:57 am »

Thank you very much I was thinking the same thing just didn't know how to put into words. I'm not a expert in the electronics field. I knew that the wires were part of the design, one quick question, I thought that I read some where that the wires were magnetic wires? Is this something that could be true or did I mix it up with something else. Again thank you. I started to design the PCB for a BFO design last night, its simple and small, I don't need anything fancy just enough to get the job done.

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	Re: Automax V4 Mod « Reply #14 on: September 27, 2009, 04:56:02 am »

	Quote:	Posted by goldigger
Whoa! You are BOTH wrong.... I can see the problem but I do not think there is an easy solution! While you both were yelling your heads off, I was looking and the drawing confirms it, more or less. The problem is, you removed a sensitive part from the circuit where short wires are essential, in doing so, you added capacitance and a smaller amount of inductance, to the circuit, it is out of balance and just might not work. Having said that, if the coil goes directly to a semiconductor (transistor, FET) it is possible you might put part of it into the working end, with the coil. If that is out, use a simple BFO circuit on a small board, in the pointer and power it through the cable.... any AF can go up the cable to other circuitry. Goldigger1950 is always short fused.... like a drop of nitro, on an anvil.... drop a hammer on it and watch it fly through the wall (I have seen it.) So both of you should reconsider your hasty words, after all, this medium is not the best way to convey information. goldigger

Nice try, Brian, but he never once said he was going to use it as an extension cable in his original question. Had he done that, I would have answered him. He added the diagram later as he began to call me names. His problem. Not mine. While it is true that there is no such thing as a dumb question there is such a thing as asking a question dumbly. He did that. Then, when I asked him to clarify, HE is the one who went off about it. Good old Outback has to chime in which bolstered his opinion but was just as wrong.

The original question was very, very unclear. I called him on that fact when he complained that nobody was answering him. I tried to help him with his QUESTION, not the answers at that point. In fact, I know a bit about his probe and why it doesn't work and I certainly don't have a short fuse. I was quite amused by the lad's phrasing of the question. All those words and he still couldn't get the idea across well enough to get an answer. Such is life.

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	Re: Automax V4 Mod « Reply #15 on: September 27, 2009, 05:25:32 am »

	Quote:	Posted by bountyhunter
Thank you very much I was thinking the same thing just didn't know how to put into words. I'm not a expert in the electronics field. I knew that the wires were part of the design, one quick question, I thought that I read some where that the wires were magnetic wires? Is this something that could be true or did I mix it up with something else. Again thank you. I started to design the PCB for a BFO design last night, its simple and small, I don't need anything fancy just enough to get the job done.

Any wire that carries a current will have a (magnetic) field around it but copper, itself is non-magnetic.

I started a small pointer project, some time ago, problem is, it is not compact enough, I have to go back and reduce things. It uses the Horizontal osc coil out of an old TV, as a BFO, around 10 kHz.

The Horizontal osc coils are about 10,000 uHy..... a cap about 0..022uf calculates to 10.73 kHz; and 0.01uf calculates to about 15.9 kHz; .0068 will get you about 19.3 kHz. The coil has a tap for oscillator feedback.

Using two .01uf in series, across the coil and using their junction as the feedback point (use an FET like MPS102) will work also. For an FET, connect a 1k resistor, to the source pin and connect one end to ground, from the source pin connect directly to the junction of these caps. you will get about 22.5 kHz

I do not have a clue what frequency you want to operate at, but you can make your search osc 1/3 of the reference frequency, for even less interaction. That is, if the search freq. is 22.5 kHz, the reference can be 67.5 khz. You get 3X gain for shift because the ref. osc is 3X freq.

There are a gazillion possibilities.

goldigger

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	Re: Automax V4 Mod « Reply #16 on: September 27, 2009, 05:55:28 am »

Thanks for everything you just said, but I have to be honest, you lost me at "I started a small pointer project" Cheesy

I'm not in anyway a electronics guy in anyway, if I see something broke i can fix it, I have repaired motherboards, taken out this bad part put the new one in, and other things, I just want a pin pointer to detect a coin at no more than 1- 1 1/2 inches, anything more than that is to much. The design that you have could the coil be connected with a length of "cable" so that it is two parts the box on metal detector shaft and then the coil so that all you have in your hand is the coil probe, sorry just want to make sure I am clear. TV parts I have a ton of, mind sending me your design. I will put it to good use. LOL thanks for everything. ♠

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	Re: Automax V4 Mod « Reply #17 on: September 27, 2009, 05:58:38 am »

on another note I see your into computers. I own a computer company,I can do pretty much anything with a computer I want, except for illegal things, but I have a ton of used parts, and even more software. If you ever need anything let me know and I will help you out.

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	Re: Automax V4 Mod « Reply #18 on: September 27, 2009, 06:30:14 am »

	Quote:	Posted by bountyhunter
Thanks for everything you just said, but I have to be honest, you lost me at "I started a small pointer project" I'm not in anyway a electronics guy in anyway, if I see something broke i can fix it, I have repaired motherboards, taken out this bad part put the new one in, and other things, I just want a pin pointer to detect a coin at no more than 1- 1 1/2 inches, anything more than that is to much. The design that you have could the coil be connected with a length of "cable" so that it is two parts the box on metal detector shaft and then the coil so that all you have in your hand is the coil probe, sorry just want to make sure I am clear. TV parts I have a ton of, mind sending me your design. I will put it to good use. LOL thanks for everything. ♠

I doubt if you could do an LC oscillator, like that and have it remain stable. BUT!! I came across a circuit using an LM555 chip that uses an untuned loop, which actually changes the phase, not frequency.... it might make a very good pointer.

It uses a meter but I can not see any reason why a piezo sounder could not be placed across the meter, or used instead of a meter. There is the possibility a piezo sounder may draw mor current than is available in the balance circuit.

I will take a look for it and get back here.

I have a better circuit diagram but it is bitmap and I will have to convert.

I think I have it, now.

goldigger

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	Re: Automax V4 Mod « Reply #19 on: September 27, 2009, 06:44:58 am »

Thank you very much, it's really for more my son than me, we both Metal Detect but I like him to have all the gadgets and gizmos, it's better when we build things together. My son recently found a 1881 Indian Head Penny, he was so proud. He's nine and loves the outdoors more than video games so that's why I encourage the metal detecting and fishing so much with tools for him to use while doing it. thanks again.

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