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Messages - zeroh

#1
Citation de: speedsterharry le Jeudi 24 Mars 2011, 11:09:12 AM
Are the potentiometers worth it for dimming ? Do you have pictures for reference ?

I don't have pictures, and I guess it's up to personal preferences, so I can't say if it's worth.

IMPORTANT! I thought a bit more about the dimming and I don't think it can be achieved by adding the potentiometers as I wrote previously. The '125 can only work as an ON/OFF switch.
If variable dimming IS required then a triple Cmos switch (4053) (instead of the '125) will work, but using an OP-AMP based switch would give better results. 

#2
Please excuse me for replying in English...

It seems that linking via Google translate doesn't always work, here's the page untranslated:
Painkilla's blog
In case neither this work, then go to the bottom of that page and click on page 14 of the blog.

Citation de: speedsterharry le Mercredi 23 Mars 2011, 11:07:08 AM
Where did you find that schematic ? I'd like to know more about how it works. Thanks

Ok, so in that blog it refers to a MSX forum (Paran... something) which unfortunately can't be browsed without a registration, anyway with the thread name (in korean characters) and a few key names I was able to get the schematic.

How does it work?

The first chip (74LS74) is connected to the H sync of the VGA connector and its output changes state every time there's a new H pulse.
The switch (TL32PO) selects if we want to erase the even or the odd lines
The 2nd chip (74LS125N) connects the R,G and B lines to GND (so it produces a black line) when there's an active pulse coming from the first IC.


If someone wants variable dimming (instead of just ON/OFF) has only to add 3x potentiometers between GND and the input pins of the '125.

Citation de: KwarK le Mercredi 23 Mars 2011, 15:47:15 PM
Pas la source des composants à utiliser, ni du schéma de montage par contre.

Components to use are 2 ICs named above and a switch for a basic ON/OFF effect, a complete schematic isn't really needed as it wouldn't be much more than the above.
I can show you a couple photos of a built circuit:




But don't be intimidated by all the wires, it looks more complicated that it really is. Most of the wires visible are needed to bring the signal from one VGA connector to the other.

Sharksym is the person who designed the circuit above, and this is the page of his blog from where the 2 pictures above were taken (sorry but also in Korean):
Sharksym's Blog




#3

Why pay 49Euro for a "SLG3000" when the effect can be replicated with a couple of ICs costing just a few cents  :-X

Schematic:


And automatic translation (from Korean. Sorry it doesn't make much sense, but it's just to show that it works):

Painkilla's blog
#4
Bornes génériques Japonaises / [Naomi] infos sur moniteur 29
Lundi 28 Juillet 2008, 22:51:55 PM
Merci à tous ceux qui m'ont aidé, J'ai eu un nouveau scan (thanks to Macklane!) :-)=
#5
Bornes génériques Japonaises / [Naomi] infos sur moniteur 29
Mercredi 23 Juillet 2008, 02:01:17 AM
I have a low post count so I can't reply via Messages Prives... :-((

Macklane,
I need a better scan of the last two pages, because it's impossible to read the values/names of the electronic components in the schematic :(

#6
Bornes génériques Japonaises / [Naomi] infos sur moniteur 29
Mardi 22 Juillet 2008, 00:25:10 AM
Citation de: Wovou le Mardi 15 Juillet 2008, 20:29:37 PM
Super longtemps après mais

Nobody read this thread anymore =?=
Macklane, please help me! :'(
#7
Bornes génériques Japonaises / [Naomi] infos sur moniteur 29
Mardi 15 Juillet 2008, 20:26:23 PM
Salut à tous,nouvel utilisateur ici! 8)

(I cannot write in French so I'm using Babelfish, hope it is understandable and I don't offend anyone in the process  :'()

J'avais recherché un manuel du sanwa 29e31 pendant quelque temps et j'ai trouvé celui qui a été signalé sur ce forum.
J'ai une demande pour macklane (Je crois qu'il était l'affiche originale):

Pourriez-vous retourner les 2 dernières pages (les schémas réels) avec une meilleure résolution, svp ?
Merci !