RS232 to RS485 Converter Bill Of Materials

A1 (C)2006 AIRBORN No part NS No part No Part
A2 LOGO NS No Part
A3 AIRBORN/BL NS Bot No Part
C1 22uf 16V 3528 sm Surface mount capaitor, Tantalum, 3528, hand solder in corner of PCB
C2 1uf RAD5 CAP5-105 th CAP5-105 Monolithic ceramic +80%/-20% 25V or better, 5mm lead pitch
C3 1uf RAD5 CAP5-105 th CAP5-105 Monolithic ceramic +80%/-20% 25V or better, 5mm lead pitch
C4 1uf RAD5 CAP5-105 th CAP5-105 Monolithic ceramic +80%/-20% 25V or better, 5mm lead pitch
CN1 D25F RS232 D25SKTEDG K5F4-GVK EC K5F4-GVK D25 Female solder pins, pushed over end of PCB and hand soldered
CN2 D9M RS485 D9PLUGEDG O0U7-8UU EC O0U7-8UU D9 Male solder pins, pushed over end of PCB and hand soldered
D1 1N4148 DIODE7.5 FR60-HCM th FR60-HCM
D2 1N4148 DIODE7.5 FR60-HCM th FR60-HCM
D3 1N4148 DIODE7.5 FR60-HCM th FR60-HCM
IC1 AT89C2051 DIP20 AU8C-GPG th AU8C-GPG This part must be programmed before assembly - will be supplied
IC2 MAX485CPA DIP8 R5YA-UWZ th R5YA-UWZ Substitute only with CMOS devices (eg LTC485CN8), can't use 75176
L1 Tx LED5MMEDG EC Bot LEDs pushed over end of PCB and hand soldered
L2 Rx LED5MMEDG EC Bot LEDs pushed over end of PCB and hand soldered
PCB LAM# AB0603356 PCLAMINATE AB0603356 NS AB0603356
Q1 BC557 TO-92B JQUI-W6J th JQUI-W6J Pads for Q1,Q2 and VR1 are quite small, carefully hand soldered
Q2 BC547 TO-92B JBVH-L2L th JBVH-L2L Q1,Q2 and VR1 must lie flat on PCB
R1 2k2 SIP8 SIP8-222 th SIP8-222 Four seperate resistors in an 8 pin (SIP8) pack
R2 3k3 AXIAL10 CR25-332 th CR25-332
R3 1k AXIAL10 CR25-102 th CR25-102
R6 1k AXIAL10 CR25-102 th CR25-102
R4 22k AXIAL10 CR25-223 th CR25-223
R5 4k7 AXIAL10 CR25-472 th CR25-472
SW1 Baud Rate SW-DIP4SM WVII-04S th WVII-04S Substitute with care - DIP switch must be low profile.
VR1 78L05CP TO-92B th (note also above) Q1,Q2,VR1 have small pads, must lie flat on PCB
XTAL1 22.1184Mhz HC49/4H NKB7-IDA th NKB7-IDA Must be low profile type; 4mm height

Version Date: 30 Jun 2006
PCB number: AB0603356
PCB size: 36.1mm x 38.1mm, 1.420in x 1.500in, HxW = 1374sq mm, 2.13sq in

©2010 AirBorn - Last updated 08 July 2010

Background Image Credit: The Catís Paw Nebula (NGC 6334): ESO, DSS2