Here i go again, will this work?

[synnie]

looking through Futurlec again and comparing parts to the Triks-C i have found the SP490
http://www.futurlec.com/Linear/SP490CN.shtml It says it is pin compatible with SN75179 .We use the SN65LBC179P with Triks-C and REN-C.To me the pinouts are the same the SN65LBC179P except there is a slight variance with voltages ( to me anyway)
http://www.futurlec.com/Linear/SP490CN.shtml
http://focus.ti.com/lit/ds/symlink/sn65lbc179.pdfas
Just doing up a BOM for Futurlec for the basic parts.
Cheers Synnie

[scorpia]

short answer synnie. they should be fine. i only breifly check the datasheet but i dont think any of the boards we run around here are they critical about the 485 chips.

let me know how they go

Peter

[synnie]

Thanks Scorpia.I have the BOM made up for Futurlec but the only part i cant get (which surprised me) is the 22 pf 200V NPO Axial Ceramic Capacitors

Can even get the ATtiny2313PU from Futurlec.

CRY11.0592 11.0592MHz Crystal $ 0.75 $ 0.75
BZX79-C4V3 BZX79 4.3V 500mW Zener Diodes $ 0.05 $ 0.05
BZX79-C9V1 BZX79 9.1V 500mW Zener Diodes $ 0.05 $ 0.05
SP490CN SP490 - Full Duplex RS485 Transceivers (SMD) $ 1.50 $ 1.50 ATTINY2313-20PU ATTiny2313 20-Pin 20MHz 2kb 8-bit Microcontroller $ 1.55 $ 1.55 LED3G Green 3mm Round LED $ 0.10 $ 0.20
R120RMF 120ohm 1/4W 1% Metal Film Resistor $ 0.20 $ 0.20
R470RMF 470ohm 1/4W 1% Metal Film Resistor $ 0.20 $ 0.40
R001KMF 1kohm 1/4W 1% Metal Film Resistor $ 0.20 $ 0.40
R010KMF 10kohm 1/4W 1% Metal Film Resistor $ 0.20 $ 0.20
R027KMF 27kohm 1/4W 1% Metal Film Resistor $ 0.20 $ 0.40
ICS8 8 Pin IC Socket $ 0.04 $ 0.04 I
CS20 20 Pin IC Socket $ 0.09 $ 0.09
HEADD6 6 Pin .100 St. Male Double Headers $ 1.20 $ 1.20
HEADD8 8 Pin .100 St. Male Double Headers $ 1.20 $ 1.20
C010U16E 10uF 16V Radial Electrolytic Capacitor $ 0.05 $ 0.05
C001PC 1pF 50V Ceramic Capacitors $ 0.05 $ 0.10
MODS8W8W 8 Way - 8 Wire (RJ45) PCB Mount Modular Socket $ 0.60 $ 1.80 Subtotal: $ 10.18 Total price: $ 10.18 USD

Just in case anyone wants to have a look.Actually have to search for the parts as i couldnt get their part numbers to come up for me through the search
Cheers Graeme

[scorpia]

looks good,

try http://www.futurlec.com/Capacitors/C022PCpr.shtml

[synnie]

grrrr...and heres me being specific and looking for a 200V part...grrrrrrrrrrr

Ive just been for a wander through my shed and looking through resistors i have stashed away....i have some 1K2, 13k, 30K, 20K and 51K packs out there..can they be substituted sort of for 1k, 10k and 27K? or is that asking to much..lol..i only have a few thousand of each

[scorpia]

without looking at the schematic i cant remember what each was for, but i would try the 1k2,13k and 20k it wont hurt anything i dont think , and if it doesnt work you can allways get some resistors from jaycar is needed. they are cheap

[TimW]

SP490CN SP490 - Full Duplex RS485 Transceivers (SMD) $ 1.50 $ 1.50


Synnie is that the surface mount (SMD) version?

Tim

[synnie]

Its SMD, but is also a DIP type too,guess ill have to wait for the package to see which one i end up with
Graeme

[FLICK]

looking through Futurlec again and comparing parts to the Triks-C i have found the SP490
http://www.futurlec.com/Linear/SP490CN.shtml It says it is pin compatible with SN75179 .We use the SN65LBC179P with Triks-C

I went through Futurlec last week ordering Triks-C parts...

I ended up ordering a MAX488 as a substitute for the SN65LBC179P,
http://www.futurlec.com/Maxim/MAX488.shtml
I "think" it's compatible.... (keep in mind I might be wrong)
(it's about $1 more expensive than the SP490 though)


The only other things I couldn't find at Futurlec were the 4.3v zener, which I ended up ordering from Rockby (I was ordering a few other bits from them anyway)... and I substituted the 22 pf, 200V capacitor for the 50v C022PC.

:)

[synnie]

I found the 4.3V Zener BZX79-C4V3 500mW.The SP490 was an SMD , you can order a DIP unit but havent worked out how to find that bit yet...i have 5 SN65LBC179P which i got from samples at Texas Instruments..so they will keep me out of trouble