Mini-Mig Bill of Materials

[CrazyProg]

For the power supply can't you get a 'univeral' power brick as is used by laptops and mini-itx computers.  Then an adaptor wouldn't be need, just use the appropiate cable for the country your in.

Regards Neil.

[whiteb]

So the Digikey part, even though Digikey list it as a 5v part, it would work at the minimig's 3.3? or we HAVE to get the one from Farnell ?

Its a pity there is not *ONE* supplier to supply all the parts.

[nBit7]

A MAX232A (5V only) may work in the circuit but I wouldn't advise it.

A correct part number for the Maxim brand part is:
MAX3232CSE+  or  MAX3232ESE+
see the data sheet:
http://datasheets.maxim-ic.com/en/ds/MAX3222-MAX3241.pdf

The CSE or ESE refer to
C = Operating Temperature Range C (0°C to +70°C)
S = Package Type S (SOIC 0.150")
E = Number of Pins category E (16 pins for this package)
or
E = Operating Temperature Range E  (-40°C to +85°C)
S = Package Type S (SOIC 0.150")
E = Number of Pins category E (16 pins for this package)

The 3 in front of the 232 is what designates it as the low voltage compatible part.

If you look at other brands be very careful to check the pinouts and package size is the same.

[whiteb]

Dennis.

CT_100U/6.3V Farnell (1135233) is not showing up in the Farnell Database.

[Colin_Camper]

I used these CAPs;

C1 C2 C9 C15   100UF 16V MINI ALUM ELECT (KA)   Panasonic   4      P833-ND
C3 C10 C11 C12 C13 C20 C23 C24 C26 C31 C32 C33 C34 C38 C41 C42 C45 C50 C53 C54 C56   CAP 100nF 25V CERAMIC X7R 0805   Panasonic   21      PCC1828CT-ND
C4 C17 C27 C37   CAP TANTALUM 100UF 6.3V 10% SMD   AVX Corp.   4      478-1677-1-ND
C5 C6 C7 C8 C16 C18 C19 C21 C22 C25 C28 C29 C30 C35 C36 C39 C40 C43 C44 C46 C52 C55   CAP 10nF 50V CERM CHIP 0805   Panasonic   22      PCC103BNCT-ND
C14   22UF 35V MINI ALUM ELECT (KA)   Panasonic   1      P819-ND
C47   CAP 22PF 50V CERM CHIP 0805 SMD   Panasonic   1      PCC220CNCT-ND
C49 C51   CAP 47PF 50V CERM CHIP 0805 SMD   Panasonic   2      PCC470CGCT-ND
C48   CAP 100PF 50V CERM CHIP 0805 SMD   Panasonic   1      PCC101CGCT-ND

Do these diodes look right?

D2 D3 D4 D5 D6   DIODE ULTRAFAST HI COND SOT-23   Fairchild Semiconductor   5      BAV99FSCT-ND

[whiteb]

The diodes look right (I think) according to the Schematics.

http://dkc3.digikey.com/PDF/T073/P1199.pdf (Diag 4A appears to be the same one) Digi P/N BAR43SCT-ND

[edit]

With the 0805 resistors, Parts list says Metal Film 1%, Digikey have them, but only 0.1% and 5% tolerance. 5% or 0.1% tolerance ?

After all 2k2 is 2200Ohms, but 2.2k is also 2200Ohms yes ?

[nBit7]

With the 0805 resistors, Parts list says Metal Film 1%, Digikey have them, but only 0.1% and 5% tolerance. 5% or 0.1% tolerance ?

Thick film, Metal film, Thin film.  All would be fine here.  pick whatever is cheapest/easiest to get.

After all 2k2 is 2200Ohms, but 2.2k is also 2200Ohms yes ?

Yes.

[whiteb]

Cool stuff, my only hesitation right now then, is the Push button switches.

What Switch is used, i was thinking "Momentary Tact"

Like Catalog page 1842, Figure 7.  Plenty of different size button/Force ratings.  http://pdfcatalog.digikey.com/T073/SectI.pdf

[Colin_Camper]

I used these;

Button1 2    SWITCH TACT SPST 130GF VERT SEAL   Cannon, ITT Industries   2      401-1828-ND


I used these resistors; cheap! 1%

R1 R15 R19 R21 R23 R51   RES 100 OHM 1/8W 1% 0805 SMD   Dale/Vishay   6      541-100CCT-ND
R2 R3 R13 R18 R27 R29 R30 R31 R32 R33 R34 R41 R43 R44 R45 R46 R47 R48 R50 R52 R53 R56 R57 R58 R60 R61 R62 R66   RES 270 OHM 1/8W 1% 0805 SMD   Dale/Vishay   28      541-270CCT-ND
R4 R5 R6 R8 R10 R16 R17   RES 560 OHM 1/8W 1% 0805 SMD   Dale/Vishay   7      541-560CCT-ND
R7 R9 R11 R28 R54 R67 R68   RES 2.20K OHM 1/8W 1% 0805 SMD    Dale/Vishay   7      541-2.20KCCT-ND
R12 R14 R35 R36 R37 R38 R39 R40 R42 R49   RES 100 OHM 1/8W 1% 0805 SMD   Dale/Vishay   10      541-100CCT-ND
R20 R22 R24 R59 R63 R64 R65   RES 4.70K OHM 1/8W 1% 0805 SMD   Dale/Vishay   7      541-4.70KCCT-ND
R25 R26   RES 180 OHM 1/8W 1% 0805 SMD    Dale/Vishay   2      541-180CCT-ND
R55   RES 1.00M OHM 1/8W 1% 0805 SMD   Dale/Vishay   1      541-1.00MCCT-ND

[whiteb]

Just keep an eye on both Farnell and Digikey pricings.

I am finding running Farnell in AU$ (My local currency), for some products, it is cheaper to buy in 50's, than it is to buy in 10's or 20's from Digikey.

[whiteb]

Colin_Camper wrote:
I used these;

Button1 2    SWITCH TACT SPST 130GF VERT SEAL   Cannon, ITT Industries   2      401-1828-ND

Thanks Colin.. Looking at those now

[Colin_Camper]

I'll check them out tonight with the PCB.

[Crom00]

In sourcing the Seven RES-805/1% 560 resistors...


Is this part suitable:

http://export.farnell.com/jsp/Passive+Components/Resistors,+Thermistors+&+Potentiometers/MULTICOMP/MC+0.1W+0805+1++560R/displayProduct.jsp?sku=9333363


I notice that the part numbers have R or K at the end, which one is better.

[koaftder]

Farnell link  (fixed)

R = ohms
K = kiloohms

1r5 = 1.5 ohms
1k5 1500 ohms, 1.5k

-- edit, fixed my fixed link, lol

[whiteb]

560R is just 560 Ohms.
560K is 560Kilohms (560 Thousand ohms)
560M is 560Megohms (560 million Ohms, but resistors don't go that high)

Seven RES-805/1% 560 resistors

1% tolerance Resistors, 0805 Package (SMC), 560R

http://au.farnell.com/jsp/search/productdetail.jsp?sku=9333363

But they come in packs of 50, so for the 7 resistors, you have to buy the pack of 50.

[nBit7]

560M is 560Megohms (560 million Ohms, but resistors don't go that high)

Actually they go much higher: 6000000 M (thats 6000G or 6T).
http://www.vishay.com/resistors-discrete/res1G/

Must admit I have have never seen one in the flesh (unless it was called an insulator).  I have seen and used 1Gig Ohm.