add r2 zip

git-svn-id: https://bucket.mit.edu/svn/nilm/zoom@7550 ddd99763-3ecb-0310-9145-efcb8ce7c51f

pcb/zoom/changes.txt

@@ -1,12 +0,0 @@
-Changes marked with * are finished in current
-
-Changes from r1a:
-* DCR011203U connections are wrong:
-  * C45 should go between VREC and PICGND
-  * ENABLE should be connected to VREC
-
-- Optocouplers need pullups on the output (reworked with 820 ohms)
-
-* Optocoupler pins 3,4 are reversed
-
-- Document connectors on silkscreen