> I have a problem with TRlog connections to MFJ-434 Voice Keyer. My LPT =
> port of computer has negative level of voltage (-4v) and when I push =
> bottoms F1-F4 than the level drops to 0v. For normal function of =
> interface from LPT to MFJ-434 I need positive voltage( from 0v to +4v). =
> How I can do it?
> Anyone know this problem?
> Thank you.
It seems very strange that you could be getting minus voltage.
Where is your group reference connected? It sounds like you have it
connected to a pin that is sitting at +4 volts instead of ground.
Tree
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