View source for DOA 40DO

==== DOA_40DO ====
40 Channel Digital Output Daughterboard.

'''Features:'''

*40 channels 
*up to 125mA per channel (continous) 
*up to 50V 
*open collector outputs (sinking action) 
*uses DOA protocol

===== Schematic and Layout =====
[[Image:PHCC_DOA_40DO_rev0_sch.png|thumb|center|500px|Rev.0 Schematic]]<BR>
[[Image:PHCC_DOA_40DO_rev0_brd.png|thumb|center|500px|Rev.0 Layout]]<BR>

===== Interconnection =====
Typical connection for 12 volt indicators with dimming circuit and selftest
(Note: no connection on Vo+)
[[Image:INDICATOR THEORY-0.jpg|thumb|center|300px|Lamp Indicator]]

===== A note to DIYers =====

This board is so far one of the hardest for DIY. Lots of thin traces with spacings of often just 8mils. In addition, several wire bridges (for single-sided boards) / top side traces (for double-sided boards) are very close to IC pads. These facts make this particular board a challenge for people who are not regularly etching PCBs at home. For details, go ask on the [http://forums.varxec.net/ PHCC forum].

===== Bill of Materials =====

see [http://cockpit.varxec.net/electronics/phcc/download.html#DOA_40DO download page].

North American users Bill of Materials [[DOA 40DO Rev0 BOM.pdf]]

===== Eagle and Gerber files =====

see [http://cockpit.varxec.net/electronics/phcc/download.html#DOA_40DO download page].