Video Sync Inverter... has anybody made a nice one?

Jeff F

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Video Sync Inverter... has anybody made a nice one?

I know you can roll your own using a 74LS04 hex inverter but I was curious if anyone has made a little PCB with some nice connectors that would take all the monitor connections and pass through the RGB and ground and then invert the sync. signals? (it would also need a ground and +5v connector to power the chip)

Seems like there may be a market(however small) for such a device. :dunno:

BTW, this would be for converting negative sync to positive sync or the other way around I guess.
 
The only problem is that ordering circuit boards for the low-volume of sales of such a thing would make it cost prohibitive. Like you said, easy to build, but PCB orders are either high-volume OR high dollar.
 
Yeah, I can just picture a nice little PCB in my head for this thing and I was hoping it was because I saw it advertised somewhere... :dunno:
 
A little PCB that could Combine Sync and Invert if necessary would be nice. Could have a solder pad or a jumper to combine sync/invert.
 
Well, I feel like I can get enough interest in making a few of these, so I will lay something out tonight, and get it priced. What features do you all want? I figure at least these:

-sync inversion
-sync combine

I should make both of these work on a switch. Now would you rather have the need for 5-volt input or 120v AC input?
 
Well, I feel like I can get enough interest in making a few of these, so I will lay something out tonight, and get it priced. What features do you all want? I figure at least these:

-sync inversion
-sync combine

I should make both of these work on a switch. Now would you rather have the need for 5-volt input or 120v AC input?

+5V would be ideal.
 
* sync inversion
* sync combine
* 2 pins input for 5v operating voltage & ground
* 9 pins in/9 pins out for video signal

Switch or jumper for options would be great but you could even get away with a solder jumper imho.

Price... hmmm... would $20-$25 be too little/too much? (no idea here on my part...)
 
i would like to see it be able power a Nintendo inverter board so you could invert colors if needed wile working on Nintendo PCB's/monitors on the bench or in the field.

Peace
Buffett
 
* sync inversion
* sync combine
* 2 pins input for 5v operating voltage & ground
* 9 pins in/9 pins out for video signal

Switch or jumper for options would be great but you could even get away with a solder jumper imho.

Price... hmmm... would $20-$25 be too little/too much? (no idea here on my part...)

I "think" I can meet that price, but you can't quote me just yet.

@timiskander: That will work, AND make it cheaper :p

@Buffett: The sync inversion for a nintendo monitor is just that the colors are driven inverted right? So using the rest of the 74ls04 can convert it correct?
 
yes the Nintendo inverter board only inverts the colors.
it does not do anything with synk. sanyo's by default are composite negative synk.
they will not synk to a positive signal.


i do not know if you can invert the colors in the chip or not.

i just wanted it to power it so it could be added inline if needed.

and it would not have to be permanently mounted in/on a test rig or bench.

but if the color inversion could be added in to the same board that would eliminate a second piece of equipment. and to switch it on or off would be cool.

i dont want this to get to pricy for everyone but it would be a great piece of equipment for me. i would buy it at what ever price you set it at. even if it is a one off for me.

i have many inverter boards laying around so it would be just a matter of getting it powered is all.

Peace
Buffett
 
So after poking around, the colors act very similar to to the sync in that they need to be inverted, so as far as I can see, it is easy to run the colors through the 74ls04 to make a simple inverter, so heck it looks like I'm throwing a nintendo adapter in the thing too.
 
So after poking around, the colors act very similar to to the sync in that they need to be inverted, so as far as I can see, it is easy to run the colors through the 74ls04 to make a simple inverter, so heck it looks like I'm throwing a nintendo adapter in the thing too.

I may be wrong here, but I don't think you can just run the colors through a binary inverter. The colors are analog (analogue for our European friends) and so you really need an inverting amplifier. I think the nintendo inverters have adjustable gain on them too.
cheers
/Tim
 
I may be wrong here, but I don't think you can just run the colors through a binary inverter. The colors are analog (analogue for our European friends) and so you really need an inverting amplifier. I think the nintendo inverters have adjustable gain on them too.
cheers
/Tim

Hmm, yeah that makes sense, I will pull the schematics up for the nintendo inverter and see how it works for sure, and then go from there. Though, I am willing to bet your right, and I can just use an inverting amplifier.
 
Yeah, when I was saying 74ls04 for Nintendo stuff, I was on my way out the door, with a mind on eating me some dinner :) I am for sure working on this, and I don't expect it to take too long to have me a prototype in my hands. I am going to be talking to a few members who have specific features they want in it, to see how reasonable some of them are, and work from there. Currently here is what is to be in it (still need to talk to a few members privately about feature requests they have):

-Self-powered
-Sync Inverter
-Sync Combiner
-Color Inverter (for Nintendo games)

I am going to work from there and may add other features as a need is seen.
 
Yeah, when I was saying 74ls04 for Nintendo stuff, I was on my way out the door, with a mind on eating me some dinner :) I am for sure working on this, and I don't expect it to take too long to have me a prototype in my hands. I am going to be talking to a few members who have specific features they want in it, to see how reasonable some of them are, and work from there. Currently here is what is to be in it (still need to talk to a few members privately about feature requests they have):

-Self-powered
-Sync Inverter
-Sync Combiner
-Color Inverter (for Nintendo games)

I am going to work from there and may add other features as a need is seen.

Just keep in mind that you don't want to raise the cost too much adding things that are too specialized...
 
Demogo,
Totally understand that there is a balancing point there. Like in Buffett's case, if he wants something off-the-wall I can make him a specialized board, but something like building in a nintendo inverter is totally reasonable feature to throw on the board to make it a handy tool, especially for how cheap it will be for the few extra parts.
 
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