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From: "PCS Electronics"
Subject: Re: Urgent help needed to blank monitor
X-Newsreader: Microsoft Outlook Express 6.00.2800.1106
Date: Tue, 5 Nov 2002 01:58:08 +0100
NNTP-Posting-Date: Tue, 05 Nov 2002 01:58:08 MET
Organization: Slovenija OnLine - SiOL
I think just a couple of resistors and transistors on the port driving a simple reed relay
for the video signal (one or all of the components) would be easier than a pic. He may not have any
experience with uCPU and it might be a lot of hassle.
Marko - PCS Electronics
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"Mike Poulton" wrote in message news:Xns92BCC0584A66mpoultonmtptechcom@126.96.36.199...
> "Ulrich Peters" wrote in message
> > Ok, this is my idea, and now I need some help. Can somebody tell me
> > what components would be the most appropriate for this circuit? I
> > think that the currents of the sync signals are pretty low, but I
> > don't have any instruments to measure them. What thyristor/triac
> > could I use, and how should I connect the TTL output to the gate? (If
> > this is a good idea at all. If you see that this won't work at all,
> > please tell me.)
> I would not recommend using thyristors for the sync lines. It might
> work, but it probably won't. It might be much easier to use reed
> relays. They can be driven from a TTL signal (though you need one gate
> each) and give you complete isolation. While you certainly could use
> discrete gates to make a parallel port activated switch, a PIC
> microcontroller might be simpler, cheaper, and easier. Ganging a few
> output pins on the PIC together would allow you to drive a pair or reed
> relays with no problem. Alternatively, you could drive a power mosfet
> with the logic signal, and use that to activate a relay that controls
> main power to the monitor.
> Mike Poulton
> MTP Technologies
> Not only do I speak for my company, I AM my company!
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