[TowerTalk] BCD relay driver ideas needed

[Pete Smith]

I bought an Ameritron RCS-10 antenna switch at Dayton, particularly 
because of its BCD control protocol.  My thought was to use the BCD band 
data output from my shack computer, running N1MM Logger, to control the 
remote relay box in parallel with the manual controller.  But in order 
to do that, I will need 3 relay drivers to supply the needed current, 
and presumably, will also need a level shifter because the relays want 
12 volts, while my LPT port is 5.

Has anyone already been down this road, so I won't have to reinvent the 
wheel?  Is there a way to use traditional PNP transistor source drivers, 
but with 5 volts on the base and 12 volts on the collector?

73, Pete N4ZR

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