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Got the MD bug and researching the various types.
Hi all. Newbie to the forum and I've been doing a lot of reading here.
Last week while doing work in my yard my wedding band (24K gold) slid off my finger and into a big pile of leaves. Well for the next couple of days my family and I searched around for it with negative results. Just as we were all about to give up on it I decided to build a MD and continue the search. Searching through lots of DIY articles I found the "Matchless" IB locator and decided to give that one a shot (after a BFO didn't cut it). I live in northern Thailand and the limited electronic shops here don't stock the 7556 CMOS dual timer so some mods had to be made to the circuit. I wound up using 2 555's instead, used 2, 9v batteries in series into a 7812 regulator, and some other little mods. It all came together and when I went out to try it, I located my ring within about 10 minutes. Big relief finding it and now I have the bug to experiment with other types of detectors. I'm retired now with an electronics/RF background so I'm not afraid to jump in. I'm really interested in the PI's and think that's were I'm heading for my next build (if the needed parts can be had around here). This looks like a great forum to get answers, schematics, helpful tips, etc.
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Regards,
Dan
Last week while doing work in my yard my wedding band (24K gold) slid off my finger and into a big pile of leaves. Well for the next couple of days my family and I searched around for it with negative results. Just as we were all about to give up on it I decided to build a MD and continue the search. Searching through lots of DIY articles I found the "Matchless" IB locator and decided to give that one a shot (after a BFO didn't cut it). I live in northern Thailand and the limited electronic shops here don't stock the 7556 CMOS dual timer so some mods had to be made to the circuit. I wound up using 2 555's instead, used 2, 9v batteries in series into a 7812 regulator, and some other little mods. It all came together and when I went out to try it, I located my ring within about 10 minutes. Big relief finding it and now I have the bug to experiment with other types of detectors. I'm retired now with an electronics/RF background so I'm not afraid to jump in. I'm really interested in the PI's and think that's were I'm heading for my next build (if the needed parts can be had around here). This looks like a great forum to get answers, schematics, helpful tips, etc.
[IMG]
[/IMG]Regards,
Dan
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