SMT Bandito Info/Build

[Koala]

started on the capacitors did not reilise they were all different sizes so will have to start again

can't find the 10uf on the board

on the board there are two over the RX but on the schematics there is only one.

have you recieved your board yet. Transistor that's on the CD4024 has very small pads might have to find a different transistor for it

C14-8.2pf :0805
C13-10pf :1206
C10-22pf C18-22pf
C16-39pf :0805
C9-100pf :0805
C12-180pf :0805
C22-10nf C2 4-10nf C23-10nf :1206
C32-22nf C33-22nf :1206
C15-33nf :through 5mm
C2-47nf :through 5mm TX coil
C19-100nf C21-100nf C20-100nf C34-100nf C36-100nf C25-100nf C28-10nf C29-10nf C35-10nf :1206
C17-220nf :1206
C1-470nf :through 5 TX COIL
C37-0.47Uf C31-0.47Uf C30-0.47Uf :1206
C38-4.7Uf C39-4.7Uf :through 2mm
C7-10Uf
C4-100UF C5-100UF C42-100UF :through 3.5
C6-220Uf C8-220Uf :through 3.5

C3-??
C11-??
C26-??
C27-??
C40-??

[Silver Dollar]

Cool. Good work! Thanks for setting that up for us. I might get 4 sets.
I have a lot of the parts but they are "only" 1% and I'm not sure if thin or thick film.

[Koala]

updated the parts list now includes all the IC's with the best specs I could find ie lowest offset, lowest current

non motion all metal mode interested me also as I normally hunt in all metal and switch to disc when over the target seem to miss less that way plus I can hear via the threshold tone when I am near an occupation area.

[Silver Dollar]

Some of the depth problem could be related to the 5V used for the transmitter. If you noticed I sent the battery voltage
over there to allow a second regulator to isolate the transmitter but you could also use 9V for it to gain some depth.

I might try running the
TGSL on +-12V to see how much difference a bigger supply makes too. The +5V -3V may loose some depth too.

The Bandito is very similar to TGSL and Tesoro called the Umax II a deeper design though we don't have schematics
from each one to see how it evolved.

I like the non motion PP myself. I may experiment with allowing a slower search speed too.

[Koala]

"I'm not sure I will even have more boards made as no one seems interested in building some. I
probably have enough boards around to do what I need..."

Does not have the following on here as the TGS.


Bandido does not have the "air" depth of some of the more modern machines. Pretty sure much of it is psychological and the grass is greener on the other side. People who have had them even pay over the odds to replace with a secondhand one after playing with the latest bells and whistles detector.

I went on a rally recently with my IDX did better than most so nothing wrong with old tech.

Your new layout looks clean

I can give you write privileges to the parts list and we can both work with the same list but don't know if it will work with US/UK difference.

[Silver Dollar]

Now that's what I'm talking about! 0.5% and dirt cheap. gotta love it! Mouser is the best!

Here's some pics of the Dual Layout, it's my first try at board layout it's kinda fun, like a puzzle.
I still have the original, original with mods, with mods and SmD caps and this monster;

[Koala]

I like Mouser good prices! I didn't know you could share a project. I wonder if you can add two projects together?
I'd like to be able to reorder the same parts again later if I get more boards. Can you order multiples of a project?

I took a copy of that board and am comparing it to our board looking for mistakes + improvements.

Yes you can order multiples of a project there is a quantity box not sure but as you can have several different project name can't see there being a problem in combining. Pretty sure you just pull down the other project name and hit buy and it would list both

Now we are on 0805 they have all but the 2.7M resistors as thin film all but two @ .5% and 25ppm/c and most are £0.06 and the others are only a few pence more no more silly prices in 0805 size

Few mistakes in it but see if this works

http://www.mouser.com/ProjectManager/ProjectDetail.aspx?AccessID=3d6026fa2b

[Silver Dollar]

I like Mouser good prices! I didn't know you could share a project. I wonder if you can add two projects together?
I'd like to be able to reorder the same parts again later if I get more boards. Can you order multiples of a project?

I took a copy of that board and am comparing it to our board looking for mistakes + improvements.

[Koala]

Going to start again using Mouser for the cheaper posting.

Just signed up with them and they have an option to share a project

Did you see the all SMT Bandido board at the end of the MD4U thread looks good think it's also proven to work if I remember corectly

[Silver Dollar]

Oops Sorry I had answered about the 0805's being OK to use but my response didn't show up
(I had some internet problems yesterday).

Thanks for the ordering info. I was able to get the basket with all the parts in it but it's in
british pounds and I'm not sure if it will change it when I order? I have many of the parts
to build the Bandito but I am also building a TGSL SMT at the same time so I think I will install
all the parts I have and then see what I'm missing. I found some SMD 4066's today but will
have to order at least some chips and possibly caps and pots.

I tweaked the layout a bit yesterday and changed all the through-hole caps to SMT. It was tough
as not much room was left. I was hoping to add the second channels to the back of the board
to make the Dual Bandito but it's a bit complicated. I may have to start all over to be able to do that.

I'm not sure I will even have more boards made as no one seems interested in building some. I
probably have enough boards around to do what I need...

[Koala]

Which means we can can go back to Mouser as they have thick film 0805 at £0.05 each and have cheaper shipping

[Koala]

0805's seem to be more prevalent. I think they might work as this show they are close in size;

1206 3.0x1.5
0805 2.0x1.3

Ebay has a wider selection of these...

I have some pcb's and some of each type I'll take a look and see if it's workable...

According to this site 0805 are a perfect fit and 2.0 mm × 1.3 mm is the size of the component

[Koala]

working through the IC's

http://www.digikey.co.uk/product-search/en?pv7=2&pv16=6548&pv16=7409&k=LM393&mnonly=0&newproducts=0&ColumnSort=0&page=1&quantity=0&ptm=0&fid=0&pageSize=25

is 7mV @ 5V the best spec

all other specs are pretty much the same except for the Current - Output (Typ)

Assuming I am right on the above using the best in stock IC's

296-14258-1-ND IC COUNTER/DIVIDER BINRY 14-SOIC 0.29000 £0.29
LM2931AD-5.0R2GOSCT-ND IC REG LDO 5V 0.1A 8SOIC 0.45000 £0.45
296-26732-1-ND IC OPAMP GP 730KHZ RRO 8SOIC 1.31000 £3.93
296-14475-1-ND IC QUAD BILATERAL SWITCH 14-SOIC 0.29000 £0.29
LM393DRCT-ND IC COMPARATOR DUAL 0.8MA 8-SOIC 0.47000 £0.94
MC33178DR2GOSCT-ND IC OPAMP GP 5MHZ 8SOIC 0.60000 £1.20

Subtotal	resistors plus IC's £10.30
Shipping	£12.0 http://www.digikey.co.uk/short/5htd7

[Koala]

working through the IC's

http://www.digikey.co.uk/product-search/en?pv7=2&pv16=6548&pv16=7409&k=LM393&mnonly=0&newproducts=0&ColumnSort=0&page=1&quantity=0&ptm=0&fid=0&pageSize=25

is 7mV @ 5V the best spec

all other specs are pretty much the same except for the Current - Output (Typ)

[Koala]

This are 1% thick film

total at the end of each line include muli purchases

RMCF1206FT20R0CT-ND RES 20 OHM 1/4W 1% 1206 £0.04
RMCF1206FT100RCT-ND RES 100 OHM 1/4W 1% 1206 £0.04
RMCF1206FT150RCT-ND RES 150 OHM 1/4W 1% 1206 £0.08
RMCF1206FT200RCT-ND RES 200 OHM 1/4W 1% 1206 £0.04
RMCF1206FT1K00CT-ND RES 1K OHM 1/4W 1% 1206 £0.24
P1.20KFCT-ND RES 1.2K OHM 1/4W 1% 1206 SMD £0.07
311-2.20KFRCT-ND RES 2.20K OHM 1/4W 1% 1206 SMD £0.14
RMCF1206FT4K70CT-ND RES 4.7K OHM 1/4W 1% 1206 £0.08
P5.10KFCT-ND RES 5.1K OHM 1/4W 1% 1206 SMD £0.35
RMCF1206FT10K0CT-ND RES 10K OHM 1/4W 1% 1206 £0.32
RMCF1206FT12K0CT-ND RES 12K OHM 1/4W 1% 1206 £0.04
RMCF1206FT20K0CT-ND RES 20K OHM 1/4W 1% 1206 £0.32
P27.0KFCT-ND RES 27K OHM 1/4W 1% 1206 SMD £0.07
P47.0KFCT-ND RES 47K OHM 1/4W 1% 1206 SMD £0.28
311-82.0KFRCT-ND RES 82.0K OHM 1/4W 1% 1206 SMD £0.07
RMCF1206FT100KCT-ND RES 100K OHM 1/4W 1% 1206 £0.29
RMCF1206FT150KCT-ND RES 150K OHM 1/4W 1% 1206 £0.04
RMCF1206FT200KCT-ND RES 200K OHM 1/4W 1% 1206 £0.20
311-430KFRCT-ND RES 430K OHM 1/4W 1% 1206 SMD £0.07
RMCF1206FT470KCT-ND RES 470K OHM 1/4W 1% 1206 £0.04
RMCF1206FT620KCT-ND RES 620K OHM 1/4W 1% 1206 £0.08
RMCF1206FT1M00CT-ND RES 1M OHM 1/4W 1% 1206 £0.16
311-2.70MFRCT-ND RES 2.70M OHM 1/4W 1% 1206 SMD £0.14
Subtotal £3.20
Shipping £12.00

I think we can share a basket information hope it flips to the USA try this http://www.digikey.co.uk/short/5mp92