Turtles in Time sound

So I just got my hands on a Turtles in Time 4 player board and hooked it up to my Supergun, I don't get any sound. So I try in my cabinet and it's fine. I look through the manual for Turtles and it said that both speaker + and - need to be connected to the speaker. It specifically says do not connect ground.

I've got my supergun wired up with the attenuation circuit like the drawing on Jamma Nation X. So my question is, how should i wire this up? Just add another switch to flip between the ground and the actual speaker - off the Jamma connector?

On a supergun you don't use the Speaker -. Check the volume pot on the PCB. It might be turned down a little too low for the attenuation circuit. Did you try flipping the audio circuit on and off on your SG? Also what PSU are you using for your SG as it could be a PSU issue as well.

Did some testing. I wired up a fingerboard and ran speaker + to inside the rca jack, and speaker - to outside and it get sound.

So I instead of running the ground to the center of the rca jack, I ran the speaker - from the jamma connector. With the switch normal, It's just a straight through connection as if it were to a speaker. With it flipped, it's attenuated just as before

So, now I get sound from Turtles as well as every other board I have and the attenuation seems to work fine too. Everything seems good.

Would leaving it like this damage any of my boards in the long run?

i remember when i had the TMNT; TURTLES IN TIME port
for the SUPER NINTENDO fifteen-odd years back.

i do not know why, but the voice sample that plays when a turtle
gets hit;

"AHHH! I'M SHELL-SHOCKED!!"

sounded to me back then like;

"AHHH! MY TABLE'S STUCK!!"

Go Fig, Eh?

How your super gun speakers need to be wired really depends on what PCBs you are using in them. Mono JAMMA games require the +(pin 10) and -(pin L) to be wired to a single speaker, they don't use + and - run to different speakers with GND like MVS stereo.

You can also see issues depending on the impedance of the speakers used. Most of your US JAMMA games are going to be as happy as a clam with 8 ohm speakers. But some JP JAMMA games might want something with a little lower impedance.

Though if you've got multiple Konami PCBs you might just want to wire in a Konami stereo harness. That's what I did with my 4 player super gun:

I've always liked the idea of having a supergun completley contained in a control panel. I didn't even think about doing the speakers in the front like you did.

It's actually a really good idea. Audio seems to be the difficult part for me. Having to worry about the onboard volume control so it doesn't blow up your tv speakers. Thoughts about screwing up the onboard amp. Seems like they could all be taken care of just by using speakers and not running it through your tv.

Can I ask if you put those hinges on that control panel, and what kind they are?

What you like about it is pretty much exactly why I did it. Though some PCBs can still have special needs regardless. Take those on a case by case basis.

The hinges and hasps both came on that control panel. It is completely stock except for the super gun innards, the rubber feet on the bottom, and the speakers. And I painted the back black to match the front an sides. Except for the weight and the slightly odd button layout it is really a nice panel to work with.

The hinges are really just regular hinges that are flat on one side. The only difference is that the one side is folded to sit securely along an edge. The flat side mounts directly to the top of the control panel. The side with the "bump"(where the two pieces interlock and fold over the pin for the hinge) is folded at a 90 degree angle and the side of the control panel base is notched so the hinge sits in it flush with the side of the panel. The physical hinge bump sits along side the front of the panel on the outside so it doesn't interfere with the top closing flush with the bottom. That make sense? Here's a better picture of one of the hinges:


You could probably buy a set of hinges and fold them yourself if you have a vise you could clamp them in. Or you could buy something like a "piano hinge" that is narrow enough and low profile.

- TGM