-Reduced component count
-On-board 5V switching power supply
-Improved circuit protection with MOV and TVS diode
-Opto-isolator layout can use NEC PS2501-1,2,or4 parts
-Better mechanical layout
-Full 5A continuous trace rating on all relays, 10A contact rating
See the pic below:
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiCiiCb3YVsEQMISZaQbaDnHlwIhqKs3Bj_-78wAZa1F_CQUxB6WMAsmIhkArGs7FD5ziHvsUWD1Xl8d5sqXzTM5FoY4snP6yyv7dXV8ANmy5F7Pd6eSFhluz-lopI8TN7JwXM5lwIxyYZh/s320/OpenAccess_v2.png)
Full source code and drawings:
Open Access - Google Code Site
Arclight
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