[GreenKeys] Doventron option schematic

[Håken Hveem]

Can anyone help me with the schematic for the option KEYBOARD OPERATED SEND 
unit ( KOS-100) for a Doventron MCP-1000C? I know that it is not possible 
to order that option from Doventron, because Hank Sharfe W6SKC vent silent 
key in April. The company Web page is altso gone. So if anyone can help me 
with a schematic so i can build that option, it will be very nice. Similar 
circuits that are easy to build and attach to my doventron will altso be great.
73 DE LC8UBT