TM 808 White's

[Leto]

Vectorising

Hi Ivconic..

but it will take a week or two for me to done them...

If you need some help on this - you can send me those scanned files via email (compress each to 2meg). I vectorise raster files on daily-basis (on my job) and estimate approx. hour for each side of manual hand-mouse labor(HQ).
So if you are occupied with other things I would be glad to help.

[ivconic]

mo' better blues...

I was thinking to clear those slowly, step by step.
Finally from those scans i should get clear pcb's.
But only way i can use right now is some paint soft
and manually do point by point. It will take much time
but at the end it will give very good results.
I am wandering if somebody know faster&easiest way of
doing this, so i decided to post again scans,but this
time much better quality, although it will take much
time for me to upload since i am still using old,damn
dial-up.....48kBps....sheeesh!!!
Anyway,if somebody knows better way,c'mon do that and post
here!
I do consider this "project" as our collective thing.
Winter is coming,man has nothing to do,lot of spare time...
When pcb finished,i do have some ideas how to modify this
thing.I intend to use original setup of TM808 and later
add few mods on it,so it will give much better performances!
White's did a great job with this,but i suspect that they
intentionally did not involve full possibilities in this
machine....problably due some further improvements.
Maybe something else...?
Michael was right about TF900. But multi freqency option is
not most important thing here. TF900 will be out of competition
when i finish this TM808 as intended at first time.
Later i will discuss this more.....
Here are scans in much better shape....Use those...if somebody
clear up those faster than me,please come here and post results
for everybody to share.....

Leto,yes...do that and post back your work! Regards!

Javi se mail-om, nemam mogucnosti da upload-ujem vece fajlove,jako je
losa konekcija ovde...

[Chris2]

TF900 Patent

Hi Ivconic,

I found the patent for the TF900 detector. Have a look how simple the design is. It's much simpler than the TM 808. Maybe you have use for it....

Keep going and post some pictures of your "Clone TM808" once it's finish.


Chris

[Leto]

bottom ready for checkout

Have found some time to complete bottom. I actually started with top of PCB but would really need some extra pixels to that raster files to finish it.
Ivconic I will send you .cdr and higher res. pictures on your email to check out - I'm sure there are mistakes (unconnected pads) I just could not decide on some parts - is it blur or copper.

[ivconic]

Wow!


Wow! You are very quick Leto!!!
Bravoo! I'll check this and post eventual corrections!
I can not compete you in this!
Bravo again!

[Leto]

corrections

I already found few missing paths in marked blue circles. Ivconic please check green circles I'm not sure there... Also I have sent you an email.
Waiting for those files to finish the board properly.
Also some questions:
As you have seen all the parts closely - are there any nonstandard parts on this board -> maybe the board needs some corrections in pads spacings?
What are the PCB dimensions?
What are the dimensions of the smallest object TM808 can pick up? It will be interesting to experiment with different coil sizes here..

[ivconic]

Bravo!


Yes you are right!
I did some checking. Yes there are few missed connections.
I corrected those and here is result.
Although this can be corrected more but only in "cosmetic"
manner. Some of "broken" lines can be straighten up etc.
On few places there were to close lines,i corrected some.
Anyway it is gonna be fine.
Leto you did a great job! Also very fast! Congratulation!
I hope you gonna do same with top side.
Component placements already shown on top side.components
values are exact mached as on posted schematic(Geo).
So, now is only matter of time to close up whole project.
regards

P.S.
I'll check my email tonight.

[nelson]

Two box with babycall from Sony

Hi, can anyone tell me if is posible to make a two box MD from a babycall from Sony. This divice has a transmiter and a reciber, the frequency is crystal controlled on the range of 49 Mhz?
Any ideas?
Regards
Nelson

Yes you are right!
I did some checking. Yes there are few missed connections.
I corrected those and here is result.
Although this can be corrected more but only in "cosmetic"
manner. Some of "broken" lines can be straighten up etc.
On few places there were to close lines,i corrected some.
Anyway it is gonna be fine.
Leto you did a great job! Also very fast! Congratulation!
I hope you gonna do same with top side.
Component placements already shown on top side.components
values are exact mached as on posted schematic(Geo).
So, now is only matter of time to close up whole project.
regards

P.S.
I'll check my email tonight.

[detectoman]

hola hermano nelson

Hi, can anyone tell me if is posible to make a two box MD from a babycall from Sony. This divice has a transmiter and a reciber, the frequency is crystal controlled on the range of 49 Mhz?
Any ideas?
Regards
Nelson

mira nelson, la frecuencia para que se penetre la tierra en el caso de los llamados dos cajas debe ser, en este caso, desde la muy baja 6 o 7 khz maximo hasta los 450 khz, esto segun lo he leeido, en el caso de ese receptor, de sony, hacerlo directamente dos cajas, no funcionaria con los 49 mhz ya que esa es frecuencia de accion aerea, o sea de mas velocidad, y creo yo de diferente amplitud, lo que se podria hacer alli es cambiarle la frecuencia con otro cristal pero no se si existan cristales abajo de 450 khz y tampoco se si podrias bajarle la frecuencia con un capacitor conectado al embobinado, esto es dejando el cristal original de 49 mhz , el capacitor el cual deberia de ser calculado en base a vueltas, y se instala en paralelo con ese embobinado o cuadro
tambien tienes que tener en cuenta, con que clase de ic esta construido ese trasmisor receptor ya que no todos resultan apropiados, pero quizas si funcionaria, claro esta metiendole investigacion

un saludo nelson
detectoman joe

[nelson]

Two box from sony transmiter.

Hola Joe.
Si creo estas en lo correcto. Tal vez este sistema se podría entonces modificar para hacer un radar de penetración para tierra, pero no se mucho sobre ellos.
Gracias y un abrazo.
Nelson

Hi Joe.
I think you are rigth. May be this system can be modified to make a ground penetrating radar, bust i don´t know to much about it.
Best regards.
Nelson

mira nelson, la frecuencia para que se penetre la tierra en el caso de los llamados dos cajas debe ser, en este caso, desde la muy baja 6 o 7 khz maximo hasta los 450 khz, esto segun lo he leeido, en el caso de ese receptor, de sony, hacerlo directamente dos cajas, no funcionaria con los 49 mhz ya que esa es frecuencia de accion aerea, o sea de mas velocidad, y creo yo de diferente amplitud, lo que se podria hacer alli es cambiarle la frecuencia con otro cristal pero no se si existan cristales abajo de 450 khz y tampoco se si podrias bajarle la frecuencia con un capacitor conectado al embobinado, esto es dejando el cristal original de 49 mhz , el capacitor el cual deberia de ser calculado en base a vueltas, y se instala en paralelo con ese embobinado o cuadro
tambien tienes que tener en cuenta, con que clase de ic esta construido ese trasmisor receptor ya que no todos resultan apropiados, pero quizas si funcionaria, claro esta metiendole investigacion

un saludo nelson
detectoman joe

[Leto]

Ready for checkout..

Ivconic thanx for high-res picture you have send to me - it helped a lot and top is already finished.
I'll send you files to your email to check-out.
Please note that I have changed position of some pads and corrected bottom side of PCB as you suggested.
Here is the superposition of layers.

[ivconic]

top side...


Here is top side, checked....
regards

[Leto]

Hi, Ivconic when in your workshop could you please verify this:
1) measure your coil resistances (2.1ohm in estebans posts) on both coils (rings)- are they the same??
2) Do the same with inductance meter ...
even if this coil is actually transformer it is probably not hard to make. Ferite ring, wire, aluminium rod and few other materials is all that's needed.
3) why is that c46 so fat?? From shematic I can see that it's only of PP kind (I guess polypropyleen) on board. Is there any voltage rating on it?
4) What about shield (on shematic drawn around coils)?? Toroid does not need lots of shelding but what about loop? is it constructed coaxial? Any ideas?? Ivconic whats the type of cable from board to coils??
5) probably stupid question - Is R1 realy 22M??

I have not checked the availability of semiconductors(+ics) yet....

Thank you.

[Leto]

too late to edit

7) please measure the resistance of L1, also can you measure wire and ferite ring diameter of L1?

Also problematic seem U10 (78540) I realy do not know what this is?? and U11 (14584-B) is this the same as 4584 logic IC??

[JC1]

fat cap

Hi Leto,

C46 is so fat because it needs to be high

insulation resistance, yes polypropylene ,

higher voltage the better, will need guard

ring traces, and "keep PCB clean" in this area

from fingerprints and grime.

look up insulation on capacitor you use.

sometimes this is hard to find.

reduces DC drift of this part of circuit.

more fun if not drift.