[rotcoddam]

I want to feed my teac with an external 28v. linear supply, using a regulator board for the 5 and 12 volt. So what do I do with the control wire (Black wire that goes from the power supply board to the amp board). Do I still need it. Or can I just hook up the 5, 12 and 28 volt?

[tyee]

Hi rotcoddam
   I'm at relatives right now, so I don't have my schematic handy but from what I remember I used the control wire to feed an RC time constant of about 2 secs which fed to an NPN then PNP transistor which then switched the 12VDC line into the main amp board. The first time I powered my unit up without delaying the 12VDC I blew a 10 amp fuse on the 24V battery line! Luckily nothing was damaged as far as I could tell. That's when I added the 12VDC delay (like Vinnie mentioned on one forum post), then everything powered up nicely.

There are 2 delays in this unit. One is this 12VDC delay, which delays power switch on to the output Tripath chip, and also enables the speakers to be enabled by delay number 2. Delay 2 is for the speakers on relay. The first one mentioned times out first, then the speakers are switched in.

tyee