SMT Bandito Info/Build

[Koala]

Looking forward to this detector. Be nice to compare to the IDX which is very similar. People who have had a Bandido love and miss them will be interesting to find out why. Seems to be the forgotten Tesoro on this site

Cheers for all the hard work quite a few seem to have been made (not surface mount) via a German website which sold a PCB for them

http://www.microsofttranslator.com/bv.aspx?from=&to=en&a=http%3A%2F%2Fwww.sucherforum.de%2Fsmf%2Findex.php%3Ftopic%3D9655.0

just reading through the forum at the moment to see if there are any more pitfalls.

See the power draw of the IC's is critical as some have used subsitutions that are better but draw more current then have trouble with the power rails.

Also the original appears to only supply just under -3 volts and some people have used two schottky diodes in the PSU to fetch it up to -4 volts but can't see if this causes other problems

After all the original worked fine

[Silver Dollar]

Doing a little research and these seem to be the correct cap values;

C1-470nf
C2-47nf
C3-??
C4-100UF
C5-100UF
C6-220Uf
C7-10Uf
C8-220Uf
C9-100pf
C10-22pf
C11-??
C12-180pf
C13-10pf
C14-8.2pf
C15-33nf
C16-39pf
C17-220nf
C18-22pf
C19-100nf
C20-100nf
C21-100nf
C22-10nf
C23-10nf
C24-10nf
C25-100nf
C26-??
C27-??
C28-10nf
C29-10nf
C30-0.47Uf
C31-0.47Uf
C32-22nf
C33-22nf
C34-100nf
C35-10nf
C36-100nf
C37-0.47Uf
C38-4.7Uf
C39-4.7Uf
C40-??
C42-100UF

The suspected values were read in circuit. Then later they were removed and read properly...

[Silver Dollar]

Tips on soldering surface mount components.
Get the smallest tip for your iron that you can find.
Get some solder wick (preferably thin like 1/8" 3/16")
Get a good set of tweezers to hold the parts.
Set the component next to the place you will solder it
in the correct orientation.
Put a small bit of solder on one pad.
Set the component in place trying to hold it perfectly positioned (a magnifier can help).
Heat the pin and solder, this will tack the component in place.
You can still change the position by heating the one soldered pad.
Make sure it is square on all sides and flat against the board.
Solder another pin. This fixes it in place. It is now hard to remove so it better be right!
Now solder the rest of the pins.
If the pins are tiny and close you might make a solder short, that is OK.
On tiny pinned parts we sometimes flood all the pins then remove the excess.
The way this is done is to use solder wick.
Try to solder quickly with minimum solder and remove excess quickly to avoid
heating the part too much. You sometimes take too much back out so doing
it quickly allows more to stay behind. A good joint has a filet to the board.

[Silver Dollar]

Here's a filled out Component list;

Components list:


R1-1.2K
R2-12K
R3-20K
R4-47K
R5-10K
R6-10K
R7-2.2K
R8-200K
R9-100K
R10-100K
R11-200K
R12-430K
R13-1K
R14-20
R15-5.1K
R16-150
R17-100
R18-150
R19-82K
R20-1K
R21-10K
R22-20K
R23-100K
R24-20K
R25-20K
R26-5.1K
R27-5.1K
R28-100K
R29-100K
R30-1K
R31-20K
R32-20K
R33-20K
R34-47K
R35-100K
R36-100K
R37-100K
R38-2.7M
R39-200K
R40-2.7M
R41-470K
R42-1K
R43-1M
R44-5.1K
R45-1M
R46-5.1K
R47-47K
R48-47K
R49-620K
R50-620K
R51-10K
R52-150K
R53-1K
R54-4.7K
R55-4.7K
R56-1M
R57-1M
R58-200K
R59-200K
R60-2.2K
R61-100K
R62-20K
R63-100K
R64-10K
R65-??
R66-200
R67-1K
R68-10K
R69-27K
R70-10K


C1-470nf
C2-47nf
C3-??
C4-100UF
C5-100UF
C6-220Uf
C7-10Uf
C8-220Uf
C9-100pf
C10-130PF (22pf)
C11-??
C12-180pf
C13-22pf (10pf)
C14-18pf (8.2pf)
C15-33nf
C16-120pf (39pf)
C17-220nf
C18-30pf (22pf)
C19-100nf
C20-100nf
C21-100nf
C22-10nf
C23-10nf
C24-10nf
C25-100nf
C26-??
C27-??
C28-10nf
C29-10nf
C30-0.47Uf
C31-0.47Uf
C32-22nf
C33-22nf
C34-100nf
C35-10nf
C36-100nf
C37-0.47Uf
C38-4.7Uf
C39-4.7Uf
C40-??
C42-100UF


IC1 - CD4024
IC2 - 2931A (LDR)
IC3, 6, 10 - TLC22262
IC4 - CD4066
IC5, 8 - LM393
IC7, 9 - MC33178


4 - 2N3906
3 - 2N3904
9 - 1N4148
2 - 1N5819


Disc Pot - 100k
GEB Pot - 50K
Threshold Pot - 100K

[Silver Dollar]

Here's a zip file with the components list (oops resistors and caps only) and a shopping list
(only resistors so far) and the schematic I will use. The component list shows some values
that are different on Chemlic's schematic. As the board is basically an updated Golden
Saber I'd suggest using values closest to what that board uses.

[Silver Dollar]

Here's the lay file in a zip;

[Silver Dollar]

Here's some info on the SMT Bandito board;
The layout files as JPG's and a viewer to look at the
Sprint? original file