Ok, I ordered 30 of this IC since they only ship via Fedex or the most expensive USPS shipping I ever saw. Anyway, all my attempts resulted on the same error: no image with just 2 grey stripes on the screen. I'm modding the brazilian master system to output RGB via scart. I'm using a sega model 2 that I modded myself removing the caps. The RGB signal I'm tapping from the VDP. Without the THS7314 there's image, it's just too dark to be comfortable. So I was hopping an RGB amp would work but for some reason it doesn't. I tried the mod mmmonkey use for the N64, using a 0.1uF caps on GND and +5v. and I also tried without it. Still no go. Any idea would be really welcome
I would try using a more traditional transistor-based RGB amp as opposed to the THS7314, which doesn't work quite as well for certain applications.
Post the circuits you're using? Traditional transistor based amp? What? Which? The THS are superior in every way to discrete amplifiers.
I'm using the mmmonkey diagram. Tried with and without the caps. Tried with and without the resistors. I also build a amp based on transistors like this: Using[FONT=Helvetica Neue, Helvetica, Arial, sans-serif] 3 BF494, this attempt gave me horizontal bars moving on the screen. The was only visible when those bars passed on the screen.[/FONT]
I meant transistor-based designs such as this: http://www.gamesx.com/grafx/pce_rgb.jpg The THS is a nice little chip, but from my experience it doesn't work well with things like PC Engine RGB mods, so I still use discrete designs for certain applications.
I'm familiar with this image. The sad part is that this transistor isn't manufactured or sold here in Brazil. It will be a pain get $30 shipping for $2 of components >(
Fandangos: can you draw a schematic of exactly how you're wiring it to which console? The images are down, plus I can't be sure how you inserted the capacitors. N64 should not require input biasing, but Master System probably will... The THS is transistor-based as well--it has a lot of very small and fast transistors arranged in an intelligent circuit which gives it far better properties than an improperly-designed discrete common-collector buffer--which does no voltage amplification. This comes down to user error, you must properly bias the inputs based on the application. The transistor is not important in that circuit, literally any small-signal NPN transistor will do...
Just uploaded the images to imgur: I'm not using any capacitor besides that one of 0.1uF. I removed the 220uF from the RGB line. So it's just VDP CHIP -> THS7314 circuit -> scart connector R G B pins. Nothing more, nothing less. I'm going to get a pot so I can check if other resistors values might work.
