Tesoro Diablo Gold Demon ....?!?!

[ivconic]

Hi friends !
Anybody have information on IC 27M2 (op-amp)??? I have been seen that in many schematics, but
i can not find it in any catalogue, due to know it's characteristics or any possible
replacement...
Also i want to make Tesoro Diablo Gold Demon, but few things are not clear to me. I am
wandering about those couple resistors in schematic, designated as 1,000 ???
Is it 1 000 ohms and should be designated as 1K or it is 1 ohm, and some joker wrote it
with comma and 3 zeroes with no reason. Or it just has to be exact 1 k or ohm without any
tolerance !?? According to my opinion it should be at least 1K at that place,although it
will be very strange to couple that input to ground with so less resistance !?
This schematic is so simple and easy to build so i would like to do it right.If someone
would like to help me about my doubts, i would be very gratefull. Many thanks in advance!
Also,anybody have any information on suitable coil for that detector? Tesoro Diablo Gold
Demon?? Any hints?

[Esteban]

Hi

Yes, I think are corrects the values 1,000 and 10,000 as 1 K and 10 K, in consideration the positions in the circuit. Any Tesoro coil working at 6.5 kHz is OK. More rare is the 20 M...? Or must be 20 k? Anyone has builded it?

[chemelec]

1000 ohms looks like a prefectly normal value for this application.

[ivconic]

Thanks !


Thanks people! Thank you very much!
I found out that 27m2 is TLC272 or one of it's clone....LS204 is also
high.sens. op-amp...The rest of schematic is "beans".....
Again thanks for such fast answers and best regards!

[ivconic]

Time to end with tesoro and all fakes....

:confused:
I finished Tesoro Diablo Gold Demon today.It failed to work.Checked again and again all.
Nothing! I made no mistake in pcb,components and etc. I put sockets on ic's. Overall
power consumption is 70-80mA.When removing LM392, it lower to 15mA.LM 392 is o.k.
I have a few of them,switched them around and always the same story!? 2907 output refuse
to oscillate. I put 330nF parallel to TX coil.When remove that condenser, 2907 start to
oscillate at 80kHz with drifts,but when adjusting with trimm. 2.5 K i can lower it even
to 8-9kHz also with drifts from time to time.
I checked various condensers with it and always the same story,it stop at once to oscillate
with some condenser on it.
When switched ON,i can hear pleasant tone for a while(5-6 seconds) than stop, and
no more tone. Adjustments with pots. and trimms. has no affect on it, only another
trimm. 2.5K increases tone pitch at start. 7660 is working nice, 7555 also,4024 also...
Checked many ways and i am 100% sure that those i.c.'s are good and working.
Positive rail is 4.9V, negative sometimes 4.7, sometimes down to 3.96V, depends on
diff. i.C.'s in sockets. Instead of lS204(can't obtain it) i checked a various op-amps like
TL062,TLC272,LM358,LM393 etc. 27M2 also unknown so i put TLC272 instead of it, but also
checked other op-amps on it's place. Nothing! No damages so far,everything is calm,
nothing burns so far.....!?? I put 7805 (2A) and sometimes it is warm, but not critical.
I am 100% sure that used good i.c.'s. Also tried several coils with it.NOthing!
The very same thing was with Bandido II few months ago!?
Either some jokers posted faked schematics(very often case on the .net), either i am not
competent to build this type of detector?
I made over 200-300 detectors so far,PI's,IB's,BFO's. "Working rate" of my detectors is
over 80% so far. But these Tesoro's are real calamity for me!
Therefore i decided to send to hell all Tesoro project i have, and never to try again to
make some of them.
I am looking for some schematic of IB, but "coinshooter", so i can detect coin on 30-35cm
depth,also wih disc. Fisher 1265 is looking nice but do not have pcb for it.Too lazy to
draw pcb of my own. There are several schematics here on this forum and on the .net, but
all sucks! Either it is old,obsolete project like "coinshooter" and "beachcomber vlf-90"
either is some to complicated with mP's and some "%#%$!@kposip;ajljd" I.C. , so i can not
find it ever in any shop or at any provider...Or it is FAKED schematic and posted just to
make joke, like that "Relic Hawk" schematic here on this forum...
Is there any exit from this situation!? Yes it is! To send to hell everything and buy
a brand new one! But i am constructor for over the 15 years,and it is my "narcotic" as Geo says.
So i am gonna keep looking further.....
If any hints,tips,ideas, schematics.....come on here!
................................................

Geo, do you have any good schematic and pcb for some IB coinshooter? Already made and tested.
If yes, than let's talk about it.I am very ready to exchange.
regards

:confused:

[maxbiri]

I built diablo about 5-6 years ago' and it work, i used a dd coil .
Never tested in real word because it haven't disc but at table it work.
If i well remember sensity was little les as eldorado and silver on coin but diablo was better on small( 4-5 mm dimension) target.
I dont remember if it was diablo or diablo gold demon.

Bye Max