TM800

[Ism]

Geo, here is an excerpt from the TM600 manual. Based on what I see in the TM800 schematic (supposed to be identical to TF900). Cave mode may just be manipulation of null setting.
The TM600 can find voids according to docs by adjustment in the null setting. The null controls we removed from user control on later models and made trim pots to be set at factory.

[Geo]

TM808 was designed by whites. Its a 6000 model without discrimination

[Koala]

is TM800 same as 'Discovery' TF600 'treasurefinder' inside?

http://jb-ms.com/Discovery/July22-2009/1237654384.html

Seems TF900 and TM800 are the same and the TM808 is an older design Suspect TM808 and TF600 will be the same

Take is some of the TF900 are Chinese copies or clones

[kt315]

to a mersi, no data, no pics inside of TF900. BTW last model was TF1200, before Discovery closed manufacturing. this attached is TM-808 that you see done in SMD, not thru hold.

[Geo]

Thanks Koala, but this site don't explain TF900 how tuned at both frequences. Anyway i believe that the change of the tuning capacitor is enough

[Koala]

http://losttreasure.com/content/archives/discovery-electronics-treasure-finder-900

Review and field test of the TF900

[Geo]

I have read that the Discovery TF900 is the same detector with the TM800. But TF900 is a two frequences detector, it works at 12.5 khz for metals and 73.5 for caves. Does anyone knows how TF900 makes the frequency change???? by change the tuning capacitor or by add turns to the coil of toroid (i don't think)???? If anyone has saw it please to reply...

[Davor]

I think this detector appears in a film ET.

[Koala]

Looks like an interesting project to experiment with

Unfortunately I can see it sitting as home and not being use unless some sort of GPS plotting could be added

Saw the thread about the successful SMD TM808 a few years ago but the coils were factory and only the main PCB made

[kt315]

[kt315]

transformers of TM800 and TF600 at RX and TX pcbs

[Koala]

Found a bit more info on the coils



Still not sure if a two box is worth the time in experimenting with

[Ism]

Even current production schematics are allowed, as long as they are not copyrighted. That is, if a schematic is created by reverse-engineering the circuitry, it does not belong to the manufacturer and can be posted.

Nice to know Carl. I remember when a schematic was supplied with virtually every electronic device you bought.
Am I giving away my age?

[Ism]

Coil appears to be one loop of aluminum tubing passed through a toroid that has the specified windings. A search of the forum for either tm800 or tf900 will have a pictorial o the method.
Spelling errors arebecaus tefrum is screwing up my typing. Think it's the spell checker. Doesn't happen anywhere else. Have to type real slow and I get tred of correcting missing characters.

[Koala]

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I to would like to know if they were all the same inside

Interesting all three models/manufactures were in Oregon.

Were the made under license or are the copies/clones.

Is there any advantage of a two box over a pulse with a large coil.


Not sure how the coils are constructed from the schematics