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ChipMusic.org / Forums / Posts by Jazzmarazz
The frequency calculation is well known. Just put in some values until you get the freqs you need.
The problem I can see is that you will need a lot of trim pots to get those absurd values. Also that the duty cycle will shift slightly, but the effect may actually be interesting.
http://www.ohmslawcalculator.com/555-astable-calculator
Thats odd, but don't worry. I believe they were/are nothing more than pull-ups for the latch pin on the 4021 (or something). And if you liked my idea, you would pull it out anyhow. Here is a quick and dirty keyboard mockup. in all honesty, it could probably fit inside the controller housing if you tried.
Note: This will not be traditionally tuned to any notes. It will just make different noises depending on the buttons pressed. It will also be monophonic if you couldn't have guessed. Have fun.
The problem with the Ninstrument circuit is not that you don't have a module, but that it works backwards from what you need. The gate inputs in that schematic are used to trigger button presses, not button presses triggering outputs.
How do you want to sounds to be altered? Different frequencies? Vibrato? Filters? Do you want a button to bridge a different resistor value on your 555 timer...what?
So playing off of what ratshack said, all of the buttons have a common ground. Lets consider this not ground, but a common connection instead. If you pull the IC and use the ground point as the common connection as in this picture, then you can build yourself a resistor ladder to use the controller as a keyboard connected to a 555 timer.
Definitely man. I feel it would possibly even appeal to the video gaming community. That s-video mod is commonly seen on gamer forums more than this site. So, if there was an all in one option I'm betting the folks that are into upgrading their consoles would desire an all in one option.
Also I know their are two version of the s-video circuit out there. I use the one that contains more passives, but I'm unsure on how much of a difference there is for others but I peronally got more banding with the simpler implimentation (Others haven't had this issue)
Heres a post with my crude test. http://chipmusic.org/forums/post/202524
It should be noted that when using the schematic by 'Zachary Karnazes' The chroma output resistor should be 75Ω instead of the 33Ω that the Luma side uses.
Though I know this would add quite a bit more board space than you might want. So the simpler one found on http://www.jamma-nation-x.com/jammax/genesismods.html might be the easier option.
This was the size of my protoboard version of the larger schematic. I bet it could be optimised a heck of a lot better with a true pcb like you're doing.
› Show Spoiler
Very cool and actually quite simple to be honest. I wonder if this would benefit from both the video and audio running off of a separate voltage regulator. I'll toy around with it and see how small I can get the board with the extra components. I actually like the idea of adding it on because I am already using all of those values of components, except for the 110k. That is an odd resistor value, but I guess I could use a 100k and 10k if space permits.
Thanks for sharing.
I wanted to like this. I did not like this.
Not you killdatschool.
Sold two more to France.
Now serving Australia, Brazil and France. 
I also got new resistors in so my stock of completed boards is back up. THanks for all your patience.
TylerBarnes wrote:I may be daydreaming out loud here, but I always imagined an all in one audio/video mod board to eventually surface where it would cover CCAM and the S-Video amplifiers all on one pcb. It seriously only a couple transistors and a few passives. I have two pcbs floating around in my current sega and while installing the CCAM, I was pondering this idea as a potential for reducing the number of mod boards inside the unit.
Maybe in the next revision. I actually planned to add a secondary voltage regulator to the board seeing as the HD graphics models had two too.
Back on this topic, I like the idea. The board would have to be a little larger, but I could also add better mounting points and the new v-reg IC. Is that something you would buy, Tyler?
Heya and welcome to the community. There are quite a few of us here in the murder mitten (I myself am not a musician) and we all seem to be pretty friendly. Off the top of my head we have snesei and barbeque (cool dudes), the one electronic (a loveable teddy bear), several other michaels and coreys, boaconstructor (moving soon), and maybe Dream Fox (two awesome dudes in tights). I can't quite remember where they hailed from when they played in Royal oak. South-ish?
I won't answer your questions mostly because others will chime in soon and just answer them time and again with their own opinions, all good I am sure. Also because a lot of your learning will be done by your own searching and discovery.
I just hang out in GPP, working on hardware stuff. I could probably help you with some mods, but am pretty tired of the hum-drum life of gameboy moddin. Currently interested in 16-bit sounds/hardware.
If I suggest nothing else, I suggest looking farther than the gameboy. There are dozens of other vintage devices that have both incredible sounds and trackers. If a gameboy is what you have on hand then by all means. I love the thing. But if you have another vintage computer or gaming console, speak up. We can help you to make tunes with that too.
i think you're right. its that, or 2025 or something. one of the very common ones
i should really commit that to memory
Or carry them for convenience. Have a drop down on your 64ems page for "cart + spare battery". I bet you could sell them at cost and drive a little extra traffic for people googling it.
Do you really have a c64g? If so, those are kings rare. Flip it and buy yourself two regular breadbins or c64c's.
And yes, SIDs are notorious for dying of a number of reasons. Bad controller inputs, wrong power supplies, etc. Its tough, but the swinsids are pretty close too.
Pull out the battery and read what kind it is, then go to any grocery and grab a new one.
I may be daydreaming out loud here, but I always imagined an all in one audio/video mod board to eventually surface where it would cover CCAM and the S-Video amplifiers all on one pcb. It seriously only a couple transistors and a few passives. I have two pcbs floating around in my current sega and while installing the CCAM, I was pondering this idea as a potential for reducing the number of mod boards inside the unit.
Maybe in the next revision. I actually planned to add a secondary voltage regulator to the board seeing as the HD graphics models had two too.
Update
Two sold
New pics added above
Tutorials coming soon
Shipping to Australia is about $6.50
That linker is giving me heart palpitations... Any cart as easy to use as the derp?
Jazzmarazz wrote:HHHNGGGGG
Damn right!
I was referring to this.
My next generation of Reader/Writers and Linkers will all be driverless USB. That is, upon connection they mount as a drive on your PC where you can drag and drop files (ROM's + Save files). Cross OS compatibility.
HHHNGGGGG
One sold but still a handful left. I would have more but my 470ohm stash ran dry.
On a scale of 1 to oh god my hands are on fire, how difficult is it to install this in a Genesis? Or better yet, link to instructions?
It is certainly no "prosound" mod for gameboy, but it is pretty much connect "this hole" to "this hole. "
I have everything labelled on the board and will link you to the instructions when I'm not on my phone, though I plan to make a more thorough instruction set this week.
You can see the extent of the install in the third picture above. 9 wires for sound and power input and three wires for output. You could also opt out of hooking up the 32xl sound and the mega CD sound if you just wanted the PSG and FM.
I would rate the install a 4 if you choose to drill holes for the outputs, and a 3 if you used the internal headphone connector. Its about as difficult as a paint by number. 
EDIT install guide for gen2 and gen1va7:
Gen2 pt.1
Gen2 pt.2
These are not my photos, but I will have my own very soon. I will also have a guide for the Genesis 3 and Nomad.
ChipMusic.org / Forums / Posts by Jazzmarazz
