CoinHawk-very interesting !!!

[Qiaozhi]

Regarding this audio amplifier - although the circuit now works, I was a little concerned about removing R6 and R11. Mainly because (if this has been traced from a PCB) then the implication is that they should probably be connected somewhere else. :confused:
Based on my previous comment that this detector appears to be designed to work with a Tesoro coil, I had a look at the Bandido audio circuit. Then I was even more certain that it is loosely based on a Tesoro design. The only difference is the power supply voltage. Hence, I think the intended circuit should as follows ->
Basically, R8 and C30 have been drawn connected to the wrong side of R11.
This make more sense.

[hawk17966]

Good idea...but...


"...Why not use Eagle PCB? It's freeware and very easy to use...."

Good idea....but....I DO NOT KNOW HOW TO USE IT PROPER !
It is shame that i am to lazy to learn few things more....sometimes makes me sick of pc computers...
I do have all those software on dozen CD's....but...
I used to draw all my pcbs manually, i do this for many years and.....thats it...
In my country people used to say:

" Donkey always stay donkey...as he used to be...." (of course i am that donkey)....

No matter, i'll spend few days, drink gallons of coffe and sonner or later i'll finish that damn pcb manually....
regards

[Qiaozhi]

"...Why not use Eagle PCB? It's freeware and very easy to use...."

Good idea....but....I DO NOT KNOW HOW TO USE IT PROPER !
It is shame that i am to lazy to learn few things more....sometimes makes me sick of pc computers...
I do have all those software on dozen CD's....but...
I used to draw all my pcbs manually, i do this for many years and.....thats it...
In my country people used to say:

" Donkey always stay donkey...as he used to be...." (of course i am that donkey)....

No matter, i'll spend few days, drink gallons of coffe and sonner or later i'll finish that damn pcb manually....
regards

OK - if you want to do it the hard way.
If you want to know how to use it properly, then read this excellent tutorial.
It will be better in the long run.

[hawk17966]

thanks


thanks, i'll try....
best regards

[Sean Goddard]

Hi All,

I was that man!! It was me who designed this machine a long time ago, it should use Tesoro heads.

I've still got the schematic on Protel somewhere, but have revised this design to include a multi channel variable tone ID and a VERY high power output circuit.

It was intended to be a commercial design, but I never built it. It was posted so that someone could do this and let me know the results as I dont have the time.

YES, I know about the error in tha audio amp...SORRY but Protel has a habit of putting connections (dots) in if you place wires too close to components.

If someone traces out a PCB, can I buy one and built this (my own) machine, or would someone build one and I'll PAY (yes REAL money) them for it?

Thanks again, I hope it works, though feel free to make any changes you see fit.

[Sean Goddard]

Actually it was intended as a "group project" for this forum (cheap R & D on my part) and for that I apologise.

Also this design was released BEFORE Tesoro brought out their HOT system on their machines. It was an attempt ot make a Bandido go a little (well, OK a lot deeper) and I'm still interested in the stability etc of the result I produced. I wonder if they got the idea from me? Wishful thinking I guess!

Bear in mind that there are only a few ways to make a VLF, they are all basically the same, there are bound to be similarities between designs, it's only certain key components which I opted to change, maybe it'll be a useless piece of junk, I don't know, but it worked in the simulations I did (well thge audio amp didn't but that was not the point) =)

[Sean Goddard]

SORRY, NOT a SPAMMER!!

Yes the +ve regulator SHOULD be a 78XX low dropout series, I'm a moron and was probably drunk when I made that typo!!

[Qiaozhi]

Hi All,

I was that man!! It was me who designed this machine a long time ago, it should use Tesoro heads.

I've still got the schematic on Protel somewhere, but have revised this design to include a multi channel variable tone ID and a VERY high power output circuit.

It was intended to be a commercial design, but I never built it. It was posted so that someone could do this and let me know the results as I dont have the time.

YES, I know about the error in tha audio amp...SORRY but Protel has a habit of putting connections (dots) in if you place wires too close to components.

If someone traces out a PCB, can I buy one and built this (my own) machine, or would someone build one and I'll PAY (yes REAL money) them for it?

Thanks again, I hope it works, though feel free to make any changes you see fit.

Ahhhh! No wonder it looked familiar.

[ivconic]

Hi Sean!


It is very good to have you here Sean! I am so glad!
This schematic is very interesting! I would like to build this,too.
I was hoping that you have already .pcb for it...and maybe to post it here..
Drawing .pcb's is always so hard for me! Most important step in homemades..
If somebody else have .pcb come here and post...otherwise i'll post it in future...first have to draw it...huh!
regards

[ivconic]

Anybody alive???

:confused: :confused: :confused:
What's about this nice schematic?
Nobody interested?
I am very interested to build this detector. It is looking very good!
I tried to trace and draw pcb for it,but lost my nerves.I tried several times,
yet without success! Problem is that i want to put all in 10.5 x 11 cm pcb, due standard housing i've been using for many simillar detectors....I'll prefer
one-sided pcb,but since it's gonna be almost impossiblle to draw such pcb,than even 2-sided can do the job! Only dimensions are bugging me.
I am very tired and have lot of other things to finish these days.
Anyone have spare time to do this pcb? For me...?
I can offer any other project i have in exchange for this pcb...
Any conversant and good willing man here?
C'mon, those who are familliar with Protel,Pcad,Orcad,Tango and simillar
can easy draw this pcb....I am not...

This supposed to be much better "coinshooter" than many good advertised
todays models on market...I have hunch!

Waiting for help!

[Qiaozhi]

:confused: :confused: :confused:
What's about this nice schematic?
Nobody interested?
I am very interested to build this detector. It is looking very good!
I tried to trace and draw pcb for it,but lost my nerves.I tried several times,
yet without success! Problem is that i want to put all in 10.5 x 11 cm pcb, due standard housing i've been using for many simillar detectors....I'll prefer
one-sided pcb,but since it's gonna be almost impossiblle to draw such pcb,than even 2-sided can do the job! Only dimensions are bugging me.
I am very tired and have lot of other things to finish these days.
Anyone have spare time to do this pcb? For me...?
I can offer any other project i have in exchange for this pcb...
Any conversant and good willing man here?
C'mon, those who are familliar with Protel,Pcad,Orcad,Tango and simillar
can easy draw this pcb....I am not...

This supposed to be much better "coinshooter" than many good advertised
todays models on market...I have hunch!

Waiting for help!

Sean Goddard put this together based on a Tesoro design, but with some modifications. I don't think it has ever been built or tested.

[ivconic]

Even better!


Even better! That makes things much more interesting!
Qiaozhi,friend, if you have time and good will to draw pcb,do that!
I'll send you anything else i have to exchange...
regards

[Qiaozhi]

Even better! That makes things much more interesting!
Qiaozhi,friend, if you have time and good will to draw pcb,do that!
I'll send you anything else i have to exchange...
regards

Hi Ivconic,

Although I would be happy to draw the PCB for you, I am very busy on other projects at the moment. Also, I am away from home in January for a few weeks. I seem to remember that Sean already has the schematic entered in Protel, and possibly even a layout. Perhaps he will read this reply and post a PCB layout as well. He was originally looking for someone to build this design.

[ivconic]

Make a noise!



OK Sean come here and "make noise" !!!
waiting....

[Sean_Goddard]

Hi guys, sorry I've been "out of the way" for a few weeks on business *Wheeee, ducks another incoming **.

I have a small request of whoever does the PCB for this, and that is this; PLEASE can you make it thru' hole, and ALSO, remember to put guard rings around ALL op-amp inputs. If you can make it FIVE layer (yes I know EXPENSIVE) then make the TOP, MIDDLE and BOTTOM layers ground planes. Make the signal entry to the Op-Amps via resistors on stand-offs if possible. I want to see HOW low we can get the noise levels on this design.

Feel free to change the Op-Amps (I tried Linear LTC1007 Ultra Low Noise types in a design recently, BIG gains in sensitivity and drop in background noise).

Slight problem with the Protel file, the laptop it was on is now part of some foreign soil (I lent it to a friend and the vehicle it was in took a direct hit from an RPG in Afghanistan) so the hard drive is probably somewhere out in the desert outside Kandahar or bits of it are!. You're welcome to help me look for it but somehow I get the feeling it's going to stay there forever.

Being me I didn't have any backups either so it's going ot have to be a trace it out job.

I'll help all I can but I'm not here most weeks at the for the nextb few months. Let me know how you get on.