Info on a Simple Radio SHack MD

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SteveNosko:


A few months ago there was a post asking for information about MDs such as schematics.  I asked if the OP had any info in this old RS simple, toy-like unit.  Going back I haven't found a reply and since the server crashed, I'm not sure I can find the OP.
However, I did manage to take some pictures and if anyone was motivated enough, the circuit could be traced from the pictures.



I have better pictures of the parts for resistor values if anyone wants them.
Regards, Steve

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ON THE HUNT:
That was my first MD ever. I remember my dad getting it for me when i was a wee one :)

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ON THE HUNT

bbwfw:
Thats cool

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pesim1:
I too have one of these they have another circuit in the detector coil as well

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SteveNosko:


Hmmm.  I don't remember anything in the coil.  It was opened, I think it just fell open.  You can see the white plastic screws I put in to hold it closed, yet allow re-opening it.  I'll add a pix of the inside of it when I get a chance.  It works ok for finding lot markers and simple stuff, but it is crude.  Too many other hobby inerests to get serious.  I was hoping someone had the Skizmat'.
  No good reason, just curious how it worked.  I'm an EE and could possibly figure it out from the circuit.
--
73, Steve, K9DCI



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Homefire:
I dissected one of those years ago.

Two coils and mine did have a single transistor circuit within the coil.

Induction Balance was the scheme.

What a hoot!





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SteveNosko:

Care to give a brief explanation of that method, or a link to one?
Regards, Steve

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gizmo:
 [detecting]how deep does it detect, had one as a kid, now have the older jetco....i see 3 transistors, mine has 5, wonder if the design will work with the jetco coil....

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Homefire:
Quote:Posted by SteveNoskoCare to give a brief explanation of that method, or a link to one?
Regards, Steve


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brucewj1955:
Sir:

Did you ever retrieve any literature... owners manual etc. related to this detector? I ask because I have 1 of 2 remaining from when my wife bought them for our kids when they were young... 15 years ago. My e-mail address is brucewj1955@yahoo.com if you might consider selling me copies of any manuals you've come across over the years.

Thanks for your time,
Bruce Jennings

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