Modification suggestions to separate a copper penny and dime

[treasurehunter747]

Curious to know if anyone has made any minor modifications to an analog detector to help separate a copper penny and dime. In particular a Tesoro detector. Most stock Tesoro detectors will not separate a copper penny and dime even when using a 10 turn pot for discrimination. If someone has made a modification to their machine or knows how this might be accomplished any suggestion would be appreciated. Thanks in advance and keep on diggin!!!
Frank

[Tibuck19]

Curious to know if anyone has made any minor modifications to an analog detector to help separate a copper penny and dime. In particular a Tesoro detector. Most stock Tesoro detectors will not separate a copper penny and dime even when using a 10 turn pot for discrimination. If someone has made a modification to their machine or knows how this might be accomplished any suggestion would be appreciated. Thanks in advance and keep on diggin!!!
Frank

Why would you want to do that in the first place ? there is a lot of history that is found throw copper pennies, and back when a lot of things were made from copper due to its ease to work. besides copper is still a viable Boolean, old copper pennies are actually worth 3 cents. my last good finds were a few a 1837 penny( they are called half pennies) and few 1850 pennies all in great shape teaching my the history of my home town.

[treasurehunter747]

Because there are a lot of parks and schools I hunt I would rather disc out pennies and go for dimes or above. That’s just an option I would like to have. I have hunted for around 30 years and sometimes I just don’t want to dig pennies.

[Tibuck19]

Because there are a lot of parks and schools I hunt I would rather disc out pennies and go for dimes or above. That’s just an option I would like to have. I have hunted for around 30 years and sometimes I just don’t want to dig pennies.

I do see your point, one school I detect, it's 30 pennies for one of dime or nickel and everything else, however, none decimation of pennies is fine by me, as the year before, I only had a PI detector, and I dug up enough nails and bottle caps to build a house with lmaooo one way I guess you could do it is with VID and cherry pick it, when you see the penny id number, but im sure you already know that.

[Nandor]

Hi
Those two targets shift the Received signal in the same phase compared to the Transmit signal, that's why you cant separate them. The MD circuit sees the exact same target.

[kt315]

TH747

good book to begin reading from. INSIDE THE METAL DETECTOR.

[SVEN1]

The US copper penny probably has similar conductivity to the US dime which has a copper core? And todays pennies have a zinc cor

Penny
1864-1962 – 95% copper, 5% zinc (Trace amounts of tin).*
1962-part1982 – 95% copper, 5% zinc (No tin).
part1982-present – 97.5% zinc, 2.5% copper (Copper plated: Inclusive of bicentennial 2009 cent and Union Shield cent).**


*the exception 1943 – pure steel, zinc-coated with rare 1943 error copper minted pennies.

**exception 1983 – rare 1983 error copper minted pennies.


Dime
With the passage of the Coinage Act of 1965, the composition of the dime changed from 90 percent silver and 10 percent copper to a clad "sandwich" of pure copper inner layer between two outer layers of cupronickel (75% copper, 25% nickel) alloy giving a total composition of 91.67% Cu and 8.33% Ni.

[qute1]

Thanks sven1 i would just be happy to find a detector that could reliably tell silver from alloys OR TOTALLY ignore ferrous so that you have half a chance of finding the good stuff.

[dbanner]

The US copper penny probably has similar conductivity to the US dime which has a copper core? And todays pennies have a zinc cor

Penny
1864-1962 – 95% copper, 5% zinc (Trace amounts of tin).*
1962-part1982 – 95% copper, 5% zinc (No tin).
part1982-present – 97.5% zinc, 2.5% copper (Copper plated: Inclusive of bicentennial 2009 cent and Union Shield cent).**


*the exception 1943 – pure steel, zinc-coated with rare 1943 error copper minted pennies.

**exception 1983 – rare 1983 error copper minted pennies.


Dime
With the passage of the Coinage Act of 1965, the composition of the dime changed from 90 percent silver and 10 percent copper to a clad "sandwich" of pure copper inner layer between two outer layers of cupronickel (75% copper, 25% nickel) alloy giving a total composition of 91.67% Cu and 8.33% Ni.

Hmm, good information.

[Tibuck19]

Hmm

I know for a fact with Canadian currency, I can knock out, modern coins including pennies with the TGSL-EDU if I discriminate passed the bottle caps it knocks them clad out along with it.

[dbanner]

Can anyone say where bronze is in the order of discrimination. I saw a graph once which showed the relative phases of the different metals, but can't seem to find it now.

[dbanner]

Now I remember, it was from the White's CMIV patent. I will look for it.

[Skippy]

Are you referring to CLAD dimes, or SILVER ones? Skin effect means that if you measure the clad one with a fairly high frequency, they will appear much lower in conductivity ( the skin is low-conductor ). How high? 50kHz would probably be enough. On one of the 'target testing' threads, Eric Foster used a specialist eddy-current testing machine that ran in the 100's KHz range, and the clad dime and silver one were markedly different in response, whereas to a typical MD (5 to 20KHz) they appear pretty much identical.
I realise this isn't a "simple mod" but it's worth discussing.

[dbanner]

Now I remember, it was from the White's CMIV patent. I will look for it.

Not there. I'll keep looking.

[green]

Some time constant measurements made with a PI. Don't know how compares with VLF.