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Documentation about the Vampire hardware

Vampire Gets "Phantom" Power From HDMI When Off

Michael Niotis

Posts 6
24 Mar 2018 21:50

After I connected my Vampire DIGITAL-VIDEO to my Scart HD Video converter I realized that it seems that the A500 is getting some "Phantom" Power from the DIGITAL-VIDEO Port. With the A500 Power supply turned off I can see Power LED being lit dimly and also pressing the Caps Lock turns the LED on/Off.

Is there any danger by having the DIGITAL-VIDEO plugged in while the Amiga is off? According to the DIGITAL-VIDEO standard the power is about 50mAmp @5Volts but I don't know if all vendors follow the standard.

Thanks

Mike




Michael Nurney

Posts 283
24 Mar 2018 21:57

ive noticed this too but it seems to cause no ill effects, its been over a year now...


Geoff Reynolds

Posts 8
25 Mar 2018 05:48

I use the cheapo SCART upscaler and noticed the same thing. Also I'm not sure if I'm imagining it now but I think I may have accidentally powered the SCART upscaler from the Vampire DIGITAL-VIDEO port once when I forgot to attach the power cable.

For this reason I now run the Vampire through a powered DIGITAL-VIDEO repeater housed inside the A2000, and also power the upscaler from the A2000 PSU via a barrel connection on the back, just to make sure everything is balanced and the vamp DIGITAL-VIDEO port is somewhat protected.


Simo Koivukoski
(Apollo Team Member)
Posts 601
25 Mar 2018 08:15

Plug DIGITAL-VIDEO amplifier between the Vampire and Video converter. It prevents the power feedback. EXTERNAL LINK

posts 4