BIY with am radio

[sa1ka]

Does anyone remember a set of plans that used an am radio as part of the build for a basic metal detector? It would have been 30 years ago and may have been through Pop. Science or mechanics.

If so, could you either forward it to me or a link, I can't find anything.

Happy New Years.

[Qiaozhi]

Does anyone remember a set of plans that used an am radio as part of the build for a basic metal detector? It would have been 30 years ago and may have been through Pop. Science or mechanics.

If so, could you either forward it to me or a link, I can't find anything.

Happy New Years.

The answer to your question is on this very website.
http://geotech.thunting.com/pages/me...rakes2_150.pdf

[sa1ka]

AH! Excellent, thank you very much.

[Geo]

Don't lose your time with it:mad: .

[detectoman]

gracias hermanito geo

jajajajajajaajaaja geo, this man, looking for some investigation o thing jejejejeje
hups i no speak or write , english buaaaaaaaaaaa

un abrazo
detectoman

[sa1ka]

no worries

Don't lose your time with it:mad: .

Thanks for the advice, I am looking for a small simple project for my son. A buddy of mine built a similar project many years ago and was quite happy with its performance, as a young man, that is!

[sa1ka]

Gracias Detectoman

jajajajajajaajaaja geo, this man, looking for some investigation o thing jejejejeje
hups i no speak or write , english buaaaaaaaaaaa

un abrazo
detectoman

[Geo]

Thanks for the advice, I am looking for a small simple project for my son. A buddy of mine built a similar project many years ago and was quite happy with its performance, as a young man, that is!

You can build a simple bfo with audio. I am sure that will give more fun to your son.
http://geotech.thunting.com/cgi-bin/.../edn/index.dat
Also you can build the PLL with meter
http://geotech.thunting.com/cgi-bin/...raus/index.dat
My wishes

[sa1ka]

Thank you for the added ideas, much appreciated. The winter is long enough for us to build all three or four! Meryy Christmas.

You can build a simple bfo with audio. I am sure that will give more fun to your son.
http://geotech.thunting.com/cgi-bin/.../edn/index.dat
Also you can build the PLL with meter
http://geotech.thunting.com/cgi-bin/...raus/index.dat
My wishes

[Qiaozhi]

You can build a simple bfo with audio. I am sure that will give more fun to your son.
http://geotech.thunting.com/cgi-bin/.../edn/index.dat
Also you can build the PLL with meter
http://geotech.thunting.com/cgi-bin/...raus/index.dat
My wishes

Please let us know what you think about the PLL design when you've built it. I built this one (and also simulated it) several years ago, and it was rubbish. There was some dispute about this in another thread, so it would be good to get a third opinion.

[sa1ka]

You can build a simple bfo with audio. I am sure that will give more fun to your son.
http://geotech.thunting.com/cgi-bin/.../edn/index.dat
Also you can build the PLL with meter
http://geotech.thunting.com/cgi-bin/...raus/index.dat
My wishes

Please let us know what you think about the PLL design when you've built it. I built this one (and also simulated it) several years ago, and it was rubbish. There was some dispute about this in another thread, so it would be good to get a third opinion.

I already have questions on the PLL design, I wonder what guage wire was used, wether it is to be jumble wound or wound like a tube, in an orderly fashion or stacked 7x7? This looks like a lot of fun for myself just in case it flops. I wouldn't want to dissapoint Junior.

[Geo]

Hi. I made it before .....who knows......25..27 years . Ohh ..what fast where pernave the years !!! With a small board and a meter is OK. As i remember it had the ability to detect a table watch (do you remember the watches was metallic) at 40 cm with a coil about 40cm ...i don't remember exactly. You must use a 0.5mm wire ... not so critical.. and an inductance 500uH...this is a bit critical.. at any form you like.
Wishes

[sa1ka]

Thanks

Thanks a lot.

[sa1ka]

Well I have the board built, and am just in the prcoess of winding the loop, wish me luck!

[Qiaozhi]

Well I have the board built, and am just in the prcoess of winding the loop, wish me luck!

Good luck.