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Tone ID for the Classic III

P

PennyFinder

New member
Found this over at the Geotech Forums...A Classic III Tone ID, cool!:clapping:

http://www.geotech1.com/forums/showthread.php?t=11186


PennyFinder
 
This mod works and can work really well. I put it together tonight and have it installed in my classic IDX. I have a switch to turn it on and off. It offers a mix mode and it is really useful. The way I have it hooked up is the all metal mode works like it normally does. Then there is a tone for accepted targets that the circuit produces. you can alter the pitch of the tone by adjusting capacitor C2. Since you can alter the pitch of your detectors all metal response by changing capacitor C31 on the Classics board, You can set both tones to anything you want. The disrimination knob determines what the high tone responds to, but the threshold is underneith it all the time.

A beer bottle cap alters the threshold as usual but clicks on the discriminated tone and produces a bad tone. I find a slight distortion with close targets and smooth tones with far away targets so there is some depth indication on good targets because a good deep target will beep but the threshold under it will be quieter. Will do a field test in a few days. Who ever VOR is who posted it is really Carl incognito or a genius.
 
Still wondering if the Classic III and the Classic II have the same circuit boards???

Thanks,
 
The classic 2 is a classic 3 without frequency adjust and black sand switch? They are the same board 2 has a few less parts. This id will work on it I bet.
 
[size=large]Thank you...Can anyone post a pic of the finished board and it's installation...Thanks again...
Also what are the LSP# references for...Are these points marked out on the main board?
And does the add-on board require it's own battery or can you tap into the main battery?

HH,[/size]
 
would this tone id also work on a tesoro compadre.mostly i wanted to change the way it sounds,higher pitch maybe?does the audio frequency control the way it sounds over a target?blowfly
 
This is a two tone ID. It uses the all metal mode and the accepted targets of the DISC. mode are heard over it. So really it is a mixed mode. I don't know anything about the tesoro you have but this circuit won't work on it the way it is in the schematic. I f you want to change the audio frequency, of the Tesoro there probably is a way. On the White's I found the chip that produces the Sine wave for the tone and changed the Capacitor associated with it. If you get the schematic you can try an experiment to find the right one, or post it on that site and someone might respond.
 
The biggest advantage is that with a normal CL3 a deep target like a dime can give off very short chirps in discrimination mode. Most of us take this for "clicking on nails" and pass by. With the Modification you can tell the difference between a goop deep target, and iron that pushes through the discrimination. With a deep dime as an example you are going to hear the all metal mode response but while passing over the target the beep of disc mode is seated right in the center of what is the all metal response. If it is Iron or other junk the disc is broken up, or it is not diectally over all metal response. Follow what I mean? Good targets really do sound good and bad targets sound well, bad. I will post mre when I get some more hunting under my belt with this. This circuit is definitally worth a try, I thing i got the parts for under $10 from Digikey and the Shack.
Basically three wires go to your regulator, one goes to a diode and the other goes to grey wire on phones. fits right inside near the speaker.
 
Keep us informed thebeatmachine! The mod is just what the doctor ordered for sure. What do you think of putting together a little kit and sell it to us less electronically thumbed fellows?
I'd buy one!

PennyFinder
 
Seems the post I made this about has been removed...I guess the mods thought it a bit fishy too...

HH,
 
Here are some Photos of the circuit installed. The IC on the breadboard with the caps is it. It fits in there real nice. There is a line running to d3, a wire running grey wire on the phone jack, and the hookups to the regulator. There are two regulators in this detector, The regulator on the left is for something else The one on the right is the origional. Also went out today with this machine and the 8" coiil which is now my favorite and found a Wheatie and a nail in the same hole 4" down. It said "Zinc" on the ID.
 
Thanks for the pics, and looks like an easy enough hookup...Are the SP# things printed out on the original circuit board? I have not had a chance to crack my SL II open in a while...

Thanks,
 
sp# things are jumper wires for the circuit itself and have nothing to do with input or out put necessarily. I all connects to pwr on the regulator, D3 and the grey wire on the phones.
 
OK...I am still kinda confused here on the schematic... Does the Batt+ go directly to the positive battery terminal? Can the ground be to any point that contacts the case? and the V+ and V- go across the regualtor right? Also where does the hookups go to the speaker or phone jack?

Thanks
 
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