[GreenKeys] The two 'adaptor boards' RS-232, TTL & 20ma loop keying

[Ralph Irish]

​So far, I've received two requests from GreenKeyers asking if those two boards were 'available'. I guess 
I failed to get my idea across. I put the images and info in the earlier message just as 'show and tell', with 
the idea that maybe someone might consider producing some of the circuits in small quantity and making 
them available on GreenKeys. 

If someone has a serious aim for this I would lend them the boards for comparison and maybe testing their 
circuits before making them available. 

Sorry if my earlier message appeared to be an offer of some kind. 

Ralph - W8ROI 


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