[Empeg-general] Re: Turn On/Off Thump

[Mike Comb]

Tony, I don't really think a wiring diagram is necessary as I disconnected everything in the process of testing.  At one point the only three wires I had connected to the empeg where ground, 12v constant, 12v accessory.

I verified (with one of those automotive probes with the test light in it) that the 12v constant feed was always on and that the 12v accessory feed was going on and off with the key as one would expect.  Whenever I shut off the ignition the empeg goes into the 'powerfail' state you mentioned.  If I simply disconnected the accessory wire the empeg did a gracefull shutdown.

I also tried running the 12v constant feed straight to the battery with the same results.

I think this isolates it to the 12v accesory feed which is going on and off, but with my limited on hand testing gear, I can not determine the exact voltage level of the "off" state.  Maybe I will try to dig up a multimeter tomorrow to determince exactly what is happening with the accesory line.  For now, it seems to me that the line may be in some intermediate state between full on and full off that is confusing the empeg.  Been a few years since my last electrical engineering course, but I think there is even a name for that :-)

Any of the empeg hardware dudes want to chime in and tell me if that is a possibility?

-Mike