640x480 vga mod - simple question

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Joined: Feb 1 2005
Posts: 16

First off - I'm not a hardware guy at all, so be gentle with me. Some insane force seems to be driving me Smile Got all the right pins isolated via dremel surgery and removed j78. Planned on using single strand 22awg wire to connect pin 20 to 24. My question - is the same weight wire ok for connecting pins 8 and 12? Or I've got some stranded awg18?

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Joined: Feb 21 2005
Posts: 28
Wires

You can't go wrong using the same gage wire, provided it will fit for what you are doing. The different gages of wire are about conductive resistance. The larger the wire, less resistance to the flow of electrons. It looks like only low level signals are flowing through the wires, so you could use smaller if you want. Have you ever felt an electrical cord and it was warm? That means the wires inside are too small, speaking of gage size. Ever heard of Monster Cable? Teens use it to blow out their ear drums used in their car audio system, anything smaller and the cable would burn in two.

Anyways, your not dealing with high voltage, only signal carrying capacity,so the smaller gages are fine, but the same size is obviously prefered, since that is what the manufacterers used. They are following safety specs, usually.

Hope this helps... Jay.

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Joined: Feb 1 2005
Posts: 16
re:wires

Thanks for the tips! Since 8 to 12 will carry some current I found some 20awg single wire that I think should work ok.

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Joined: Dec 20 2003
Posts: 354
Re: Wires

jbhasman wrote:

Anyways, your not dealing with high voltage, only signal carrying capacity,

Actually, it is high voltage. From the FAQ:

"To put the proper horizontal deflecting voltage onto pin 8, you must solder a jumper from pin 8 to pin 12 (also clearly marked; see photo above for) on the same transformer. Make sure to use insulated wire that is sufficient for carrying a fairly large current; anything with a conductor about the thickness of the power transformer's pins will be sufficient."

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Joined: Feb 21 2005
Posts: 28
Re: Wires

jbhasman wrote:

You can't go wrong using the same gage wire...

...but the same size is obviously prefered, since that is what the manufacterers used. They are following safety specs, usually.

That is why I recommended the same size twice. However I didn't know about the VGA Mod persay, just answering basic electrical question.

And yes while it is High Voltage, it doesn't necassarily mean high Amprage, which is the killer. Ever seen someone put their hand on a big steel ball and their hair stands on end? High Voltage Low Amprage.

Thx, Jay.

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Joined: Feb 1 2005
Posts: 16
Success

Completed the vga mod and after adjustments, it looks pretty good. A little narrow, so maybe I'll try the suggested capacitor fix. Or maybe I won't test my luck at soldering and be happy with what I have Smile

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Joined: Feb 1 2005
Posts: 16
Capacitor fix for barrel distortion

Worked up the courage and added the capacitor at cl26. Used a 1nf rated at 2kv. Worked very nice - screen seems to be a little jittery at boot time, but looks great after that. Just curious, I had some caps rated at 3kv - what would have been the difference using one of those?

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Joined: Dec 20 2003
Posts: 180
None!

Glad to hear of your success!

Stuart

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