CurtPalme.com Home Theater Forum

SNVP · Joined: 29 Nov 2007 Posts: 3

What is the rail voltage for the box? I need to know because I need to have negative sync - that is +/- 5V or greater. Does anyone know what the power supply to this box is?

Simon

**kal** · Posted: Thu Nov 29, 2007 2:19 am Post subject:

I assume you're referring to the EXT-HD?

Just curious - why do you need a 5V swing on sync lines? Most video signals are 1V or so (at most).

Kal

SNVP · Joined: 29 Nov 2007 Posts: 3

The EXT-HD - sorry for the confusion

SNVP · Joined: 29 Nov 2007 Posts: 3

We have a processor that needs to have +/-5V swing in order to accomodate the enhanced modulation.

**kal** · Posted: Thu Nov 29, 2007 3:34 am Post subject:

So while the video lines (R/G/B) usually are around 700mV max (some do as high as 1V), I'm not sure about H/V sync lines.... are they usually higher? Anyone know?

Kal

WTS · Joined: 08 Mar 2006 Posts: 1276 Location: Calgary

Hi,

Typically normal sync levels are -.3 v and for tri level it is +/- .3v. Now some units output TTL level sync which is 5v, but I've never heard of a sync signal with a swing of +/-5vdc and I can't imagine where or why it would be required in any circuit. If you want to get those kind of levels get a TTL to RS232 convertor and pad the outputs to +/-5vdc.

**kal** · Posted: Thu Nov 29, 2007 2:27 pm Post subject: Re: Need for swing