#sdiy

Err, i mean, one of a kind audiogear pieces designed and assembled by yours truly. Seriously, i want to get back into SDIY but that requires quitting my job, which requires money. SO! Go buy my Unique Amazing Designs and Get a Piece of SYNTHFOX (and soon-to-be Equine Eleqtronics) History! These are all fully functional and intended to be used for sound and music.

If you visit this page of mine, you will find a list of what's up for sale right now. Currently it's all Eurorack modules. Some of them took liters of sweat blood and tears and are literally my children, but i'm letting them go in a motion to create space and resource for new research. Would you get more bang per buck from Make Noise? Yes. Is their stuff one-of-a-kind designs thought up and built by a crazy trans horsegirl? No. So come over and consider your options!

Whelp... mighta been smarter to try and match transistors (or match the pnps and npns equally bad)

Basically the maximum fall time on the slope generator is way too quick. I narrowed the issue down to the transistor network, but I think I can tweak something on the fall cv to compensate.

For example - I wedged a resistor in parallel with another and was able to get something closer, but I need to run some numbers and figure out where i have room to solder

Turns out i messed up the silkscreen in one place.. the one i have to put components at myself, orienting by the said silkscreen. So the frequency range is back to normal! Also resolved some level shifting issues (had to remove the complicated circuit i made and just throw a wire instead) so now all the digital controls are reading normally.

The antialiaser is not doing shit for some reason.. not sure what i'm doing wrong. And also the sub-osc is a nice stepped sawtooth, but it has a strange spike in the middle of the waveform which i'll have to figure out.

I made a thingy that syncs a gameboy and a modular - without any arduiners or the sort! As promised - dropping the schematic and some details, also photos of the complete thing and a demo of gameboy synced TO the modular processed THROUGH the modular, along with some additional synthy sounds.

The idea is very simple: 1/16th modular clock in, LSDJ on gameboy picks up the tempo in MIDI sync mode. It can be assembled like this on a veroboard. Powered from the gameboy itself. Mine has its link port broken out to a header at the bottom of the unit because i'm a nutcase, but you can sacrifice an actual link cable.

Here's the schematic. Since LSDJ treats 0x00 to the link port as a clock message and wants 24 of them per 1/4th of a mesaure just like MIDI, so, 6 of them per 1/16th, we just need to send 6 0x00s in a row by tying data in to ground and pulsing the clock 8 times. This advances the song by a sixteenth. This thingy starts the local clock when it receives a signal from the modular, counts up to 48 (6 bytes * 8 zeroes) and then stops localclock until further notice. Loosely inspired by Gwem's take on the matter.

The issue with my design is it will mess up all the table timings LSDJ and especially the P command, because LSDJ expects its 24 clocking messages EVENLY DISTRIBUTED across each quarter, and times itself off of each byte. But we fire them in four bursts of six in a row each for the four sixteenths per quarter. So its finer timing goes haywire.

It's a proof of concept and a valid tool if all you need is to do some simpler bleepbloop noodling. It absolutely demolishes a song i worked 8 hours on cause it has so much complex tables going on, and i'm keen on using P a ton. If you want actual precision, either use actual MIDI or experiment with PLLs to multiply the 1/16th coming from the modular by 6 to get 1/96ths, and then fire a single clock message each 1/96th, which is what LSDJ expects.

Veroboard layout for the valiant ones. Diodes are 1n4148, transistors 2n3904.

I figured out I could map the bits from the counters to slightly less intuitive multiplexer channels to reduce the part count!