sixey.es > sounds > circuit bending > bontempi.html
First off, my knowledge of electronics is... lacking, so take everything here with a grain of salt. Nonetheless, let's see what i can find out.
Can't manage to find any info on it. Here's my attempt to find out what the pins do:
1: - 2: ? 3: ? 4: ? 5: ? 6: keys 7: keys 8: keys 9: keys 10: keys 11: keys 12: GROUND 13: ? 14: keys 15: keys 16: keys 17: keys 18: keys 19: keys 20: keys 21: keys 22: keys 23: keys 24: audio out 25: audio out 26: audio out 27: audio out 28: audio out 29: audio out 30: audio out 31: audio out 32: - 33: keys (numbers) 34: keys (numbers) 35: keys (numbers) 36: keys (numbers) 37: keys (numbers) 38: keys (numbers) 39: keys (numbers) 40: keys (numbers) 41: - 42: - 43: - 44: - 45: - 46: - 47: - 48: - 49: - 50: - 51: - 52: ? 53: GROUND 54: - 55: ? 56: - 57: ? 58: keys 59: keys 60: keys 61: keys 62: keys 63: keys 64: keys 65: keys 66: - (maybe, leads to unused pad i think) 67: - 68: - 69: ? 70: ? 71: ? 72: GROUND 73: keys 74: keys 75: keys 76: keys 77: keys 78: keys 79: keys 80: keys
First attempt: audio out
The thing lacks any output except a speaker, so i'd like to begin with adding one of those. Should be simple enough IMHO: add a jack parallel to the speaker, right?
Fucked that up somewhat by wiring it completely different:
What would happen is the speaker would be completely silent UNTIL i put in a cable and bridged the tip and sleeve.
In my defense, i was busy taking care of these noobs
Second attempt: audio out II
So as i had earlier somehow put the speaker between the jack and ground, i had to open up and remodel a bit, a few new wires and so on... but the problem stayed! What now? I though maybe i messed up which of the two original speaker connections was ground, but no, that was correct... then it dawned on me. I had just assumed which of the pins on the jack was the normal connection and which was the wire. Eh.
I'm currently waiting for the iron to get hot so i can fix that.
Yeaa boi. Figured it out. Also, the way i put this together meant i could try different resistors by the line out and find which one gave a nice volume. Turns out, 4.7K ohms did the trick! Incidentally, that might be the lowest value i've got, so 🤷♀️
You see! Clear as day!
The biggest problem i've had is that the thing relies on pressure to keep the keys spongy, and while at first glance it looks like there's a lot of room in the case, just a few wires can upset that pressure, making the keys stale and unplayable. So some effort has to be put toward making sure the cables are at reasonable places. Piece of shit, super boring and annoying, i hate it.
But yea! At this time, the thing works! 😎🐱😎🐱😎🐱😎
Audio exampleline in 2 morphagene w/ chours bullshit
Breaking out the bitsSo thing is that the mother brain chip outputs the audio signal on eight pins, which are converted to a nice and lean audio signal in a "resistor ladder" which i've heard is a thing. The board doesn't contain much fun stuff anyway but at least these i can fuck with.
My plan is to put two "patch bays" with eight outputs (from the chip) and eight inputs (to the resistor ladder) so that i can mess with the order of the bits basically. This is done on one of these boards --> Basically like the the DREZNO eurorack module if you're familiar.
So i get to work removing the DAC (resistor ladder). In its place i put all these red wires and it's a bloody mess. The red ones are thinner so i switch out everything in the line out circuit to these as well for a "slim profile" hoping i can get the thing to close correctly. Apart from the eight bits there are two more "mystery pins" on the DAC. One must be the output, and i guess the other is ground or a reference voltage or something? I don't know anything about these things.
Because of the previously described thinness of these wires i need no new holes or anything, i'll just pull everything through the old ones.
So what happens is that i can reorder the bits in the output, and what that means in real life is i can make the sound be distorted, it's a kind of waveshaper (might have said that before but it's true), and that also fucks up the envelope and if i do it right it's just full volume for the entire duration of the sound.
It sounds better some times than others. Well well.
- Bend electricity to your will like a puppet master
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- Somehow the line out is broken again