Difference between revisions of "DOA 40DO"
From PHCC
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*open collector outputs (sinking action) | *open collector outputs (sinking action) | ||
*uses DOA protocol | *uses DOA protocol | ||
| + | |||
| + | Note: | ||
| + | If needed the same board layout can be used for current sourcing outputs. | ||
| + | Replace the original ULN2803 by UDN2981. | ||
| + | Reverse the polarity of C10. | ||
| + | Do '''not''' mount or remove R9. | ||
| + | Connections to CON2 have to be reversed. | ||
| + | GND becomes +Vout and +Vout becomes GND | ||
===== Schematic and Layout ===== | ===== Schematic and Layout ===== | ||
Revision as of 12:52, 18 October 2009
Contents
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
Note: If needed the same board layout can be used for current sourcing outputs.
Replace the original ULN2803 by UDN2981. Reverse the polarity of C10. Do not mount or remove R9. Connections to CON2 have to be reversed. GND becomes +Vout and +Vout becomes GND
Schematic and Layout
Interconnection
Typical connection for 12 volt indicators with dimming circuit and selftest (Note: no connection on Vo+)
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 PHCC forum.
Bill of Materials
see download page.
North American users Bill of Materials media: DOA 40DO Rev0 BOM.pdf
Eagle and Gerber files
see download page.