I think that is correct.
I don't have the problem you do - I bought one of the HP relay drivers and built a small board with a DIP socket, that lets me plug in the attenuator and drive it using the switchwes. The drivers are cheap ($25) but the cables with matching plugs can be a bit harder to find.
Cheers!
Bruce
Quoting bagojfalvibagoj@...:
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I'm looking at the board now and other than the ULN2003A drivers, there are 4 D flipflops which makes me wonder if this needs continuous supply in order to retain state correctly.
Since I was turning the psu on and off it might've caused the improper behavior.
