Ok I hooked up the digital audio mod for Super Nintendo like the gameSX website shows but I am NOT getting any sound I am using CS8406 chip and hooked up per the diagram on Gamesx.
I am using CS8406CSZ - is this compatible?
I noticed that when using the optical connector the light coming from the cable was very dim compared to my DVD player - much brighter. I know everything is connected right I even hooked up coax. I have tried 3 different receivers none of them detect any sound. Even if the receiver isnt compatible should I hear something?
I'm assuming you already double and probably even triple checked every connection to make sure it's going to the right thing.
I can't tell from your pic because the adapter board is a little confusing, but do you have every pin of the CS8406 connected to something? I think there's 4 connections to the DSP chip, then one output pin, then the rest of the pins are either grounded or connected to +5v. Did you do this?
I also can't tell from the pic, did you insulate the bottom of the adapter board? That case to the audio module thing is grounded, so you'll likely be grounding out the CS8406 if it's not insulated from it.
The plans show two resistors on the output pin, which are only used if you're outputting via a coaxial with RCA connectors or whatever. You don't use those two resistors if you're using a TOSLINK (fiber optic) connection. If you had those two resistors in place, that could explain why you had a dim light.
Pins 15 and 25 are not connected. Also I dont have a cap between Ground and 5V.
Should I add and what value? Non polarized?
So I did the 5V and all the grounds, nothing shorted and double checked connections with ohmeter.
Also when using optical I didnt use the resistors. Turning the system on the optical cableis very dim. My blueray when initialing turning on is the same dim level but then goes really briht. Is that an indication of signal?
Yes, you should add a cap between 5v and GND. That datasheet says to use a .1uF, very common practice.
It has been said that the SNES doesn't conform to the 32kHz standard, and that a receiver might not like the signal. But it must be a rare case (I've never heard of an example where it didn't work for that reason) and if you've tried 3 different receivers then it's most likely not the problem, but you never know.
yes directly from the 7805. I have looked at the data sheet but I get confused with the Software Mode, Hardware Mode, etc. Do I need to worry about any of that? I wired it exactly how it is on Gamesx.com but no luck..... =(
Its possible your receiver doesn't like the signal. I have heard of one receiver on all of teh interwebz that had this problem. If this is the problems you will not hear anything. Your receiver will refuse to lock onto the signal.
Make sure you have everything set up on you receiver right. This mod can be a pain to test because everything has to digital handshake before anything will work. Whether you're using digital coaxial connection or Optical, when plugged in, and the SNES is on your receiver should display some sort of indicator that a connection is there. This has been the case for me, even if not all pins were wired correctly.
Honestly in likelihood the problem is just something is miswired. I know you said you double triple checked, but usually thats what this stuff is.
The 0.1uf Cap its not necessary to make the mod work. Its just good practice to place this between the +5V and Ground lines to prevent anything from hurting the chip. The chip you chose is fine, and I believe that's the exact package of chip I used on my SNES and Saturn.
Don't worry about the datasheet's modes. The GamesX diagram is correct. I'll willing to bet the problem is you have a pin grounded or +5V that isn't supposed to be. Check the handful of pins that are opposite of those in the rest of the row. You may have accidentally bridged two adjacent pins that require opposite polarity.
Lastly check with a lighted magnifier that your signal wires are properly attached to the sound module at the proper points. Those pins are small, and its easy to mis-attach them.
I have tested on 3 receivers - I am going to assume something isn't hooked up right or maybe the chip is bad. I have rechecked my solder points, started to check for cross shorts last night no luck. I did test shorts next to corresponding pins a couple times all is fine there.
