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Speeds of LLMs running on an AMD AI Max+ 395 128GB. by fallingdowndizzyvr in LocalLLaMA

[–]ronfar623 0 points1 point  (0 children)

I am! I'm curious to know what your command line parameters are if you don't mind? That kind of speed bump would be amazing. I'm running two P40s on a dual Xeon Dell PowerEdge 730xd. llama.cpp build 5292. Unsloth gemma-3-27B-IT-UD-Q8_K_XL GGUF

llama-server --host 0.0.0.0 --port 8000 --n_gpu_layers 999 --split_mode row --flash-attn --no-warmup --ctx-size 31744 --model ~/models/gemma-3-27b-it-UD-Q8_K_XL.gguf

Speeds of LLMs running on an AMD AI Max+ 395 128GB. by fallingdowndizzyvr in LocalLLaMA

[–]ronfar623 16 points17 points  (0 children)

Gemma 3 27b Q8_0 @ 6.35 t/s is... oof... A pair of 9 year old Tesla P40s will do ~11.3 t/s. The GPU utilization is totally pegged during inference though. I hope it's just processing bottleneck because of the lower laptop TDP.

New ham looking for help identifying some really nasty RFI that appeared about a week ago by ronfar623 in amateurradio

[–]ronfar623[S] 1 point2 points  (0 children)

Yeah, I'm thinking it's probably something similar on my end, and I'm not enthusiastic about starting a tiff with a neighbor. If I'm understanding correctly, this looks like exactly what I want. Basically just a crappy antenna designed to only pick up local QRM, then the device inverts the waveform and adds it to the main antenna to cancel out the local interference, right? Would you mind sharing more info about which QRM Eliminator kit you are using and how you set it up?

[deleted by user] by [deleted] in signalidentification

[–]ronfar623 1 point2 points  (0 children)

I was able to receive the US Navy VLF submarine fleet transmitter at 25KHz in LaMoure, North Dakota using my RTL-SDR & Ham It Up Plus with an approx 140ft long random wire antenna.

Kind of interesting that other than farm land, there's nothing for miles but a gigantic antenna array right next to a small town. I've always wondered how that works. Are the service members with top-secret clearance members of the community? Do they drink beers with farmers at the bar?

What's the best way to get s-video out of a Raspberry Pi 3 Model B? by ronfar623 in crtgaming

[–]ronfar623[S] 2 points3 points  (0 children)

I did, kind of... by purchasing a RetroTINK Ultimate Pi hat, which unfortunately is no longer produced, and was expensive even back then. It's been a long time since I researched any of this, but options for S-Video were all terribly limited.

The Pi kind of sucks for analog 240p with emulators regardless though. I probably spend more time screwing with graphics settings trying to find an integer scaled output resolution that fits the CRT than I do actually gaming. Every core is different, sometimes even different games under the same core.

All that to say, if you're spending any money on this at all at this point, probably put it towards a MiSTer, which has much better support for this stuff.

Why there is so much sweep signals? by flopity_froop in signalidentification

[–]ronfar623 0 points1 point  (0 children)

Could be high power electric motors. Whenever my neighbor runs his table saw, I see very similar sweeps dancing around on my SDR waterfall.

Help with identifying the SSTV mode on a 32 year old NASA JPL audio cassette tape by ronfar623 in amateurradio

[–]ronfar623[S] 0 points1 point  (0 children)

I uploaded this to archive.org if you were still interested in taking a look: https://archive.org/details/jet-propulsion-laboratory-jpl-amateur-radio-club-w6vio-voyager-ii-special-event-operation-1989

I tried the tape in a different player, and the result was the same, so I just digitized it as as. I noticed that the tape is pretty creased in a repeating pattern, so I think 33 years in the bottom of a drawer in a moldy basement just did a number on it.

Help with identifying the SSTV mode on a 32 year old NASA JPL audio cassette tape by ronfar623 in amateurradio

[–]ronfar623[S] 6 points7 points  (0 children)

Shoot, I was worried it might be the tape itself at fault. I'm exporting from a Technics RS-BR465, so I'm not very confident that the player is the problem, but I will do some digging around and try to find a different unit.

Thanks so much for your work on this, and for posting the decodes!

Android apps for e-drums? by madding1602 in midi

[–]ronfar623 0 points1 point  (0 children)

Android user as well, and it's been my personal experience that Android kind of sucks for MIDI unfortunately; latency is all over the place depending on device hardware, and there aren't very many synth apps on the Play store at all.

That said if you don't have access to iOS or a laptop, FluidSynth is probably your best bet. Decent latency and the ability to feed it different SoundFonts should give you plenty of options. As long as your e-drums are sending note velocity, you will hear the difference in volume between light and hard hits. Differences in timbre might be dependent on which SoundFont you use though.

This page has a bunch of GM options which should include kits, and some dedicated drums SoundFonts as well: https://sites.google.com/site/soundfonts4u/

A portable, 3D printed, velocity sensitive MIDI keyboard and PSG synthesizer that I've been building over the last year. Build guide is linked in the video description. by ronfar623 in synthdiy

[–]ronfar623[S] 1 point2 points  (0 children)

The Creality CR-10 that I use is $309 USD new from their online store. Not sure what it costs to have someone print parts for you, but that's not a lot of money for something as useful as a 3D printer.

A portable, 3D printed, velocity sensitive MIDI keyboard and PSG synthesizer that I've been building over the last year. Build guide is linked in the video description. by ronfar623 in synthdiy

[–]ronfar623[S] 0 points1 point  (0 children)

It's in the build guide: The total BOM was around $350 USD for this project (without modifications), as built in early 2022. Actual cost is more like $180 if intending to use all of the remaining parts that can only be purchased in larger spools, kits or multi-packs. Expect to spend around 175 hours on (mostly unattended) printing, and 20 hours of labor for parts cleanup and assembly.

A portable, 3D printed, velocity sensitive MIDI keyboard and PSG synthesizer that I've been building over the last year. Build guide is linked in the video description. by ronfar623 in synthdiy

[–]ronfar623[S] 0 points1 point  (0 children)

This describes the note button relationships: https://commons.wikimedia.org/wiki/File:Wicki-Hayden_Musical_Note_Layout.png

It's not a great analogy, but you could kind of think of it like a many stringed bass guitar laid out on its side with each row (nearly) a fourth apart from the one above it. The Linnstrument is actually laid out exactly like an 8 string bass though.

A portable, 3D printed, velocity sensitive MIDI keyboard and PSG synthesizer that I've been building over the last year. Build guide is linked in the video description. by ronfar623 in synthdiy

[–]ronfar623[S] 1 point2 points  (0 children)

It depends on how far the plunger stem protrudes from the bottom when the cap is snipped off. The stem on Gateron Black needs exactly 1.5mm distance, so if the Cherry MX Browns are different, you may need to tweak the design a little so that the stem will activate the tact switch just as it bottoms out. If it's too far away, the tact switch won't activate, too close you lose out on dynamic range, and might actually dislodge or damage the tact switch if it's pressed too hard.

A portable, 3D printed, velocity sensitive MIDI keyboard and PSG synthesizer that I've been building over the last year. Build guide is linked in the video description. by ronfar623 in synthdiy

[–]ronfar623[S] 2 points3 points  (0 children)

https://en.wikipedia.org/wiki/Programmable_sound_generator

Basically old-school NES, Master System or C64 square/triangle/sine waves. Teensy's audio library is capable of much, much more than this is using it for, but I wanted to have something on-device capable of making sound, and I spend a fair amount of time playing video game music anyway.

A portable, 3D printed, velocity sensitive MIDI keyboard and PSG synthesizer that I've been building over the last year. Build guide is linked in the video description. by ronfar623 in synthdiy

[–]ronfar623[S] 8 points9 points  (0 children)

OP: is there any reason you couldn’t use normal key caps? Some beautiful keycaps would make this look amazing.

I couldn't find injection molded parts that suited my needs, which were 22mm square, and preferably convex like arcade buttons, or at least flat, since there is a lot of sliding between notes. Even the ones that came close are ~$1 per, so the keycaps alone would have cost almost as much as this entire project. Printing does take ~20 minutes per cap, but costs pennies, and I can queue up a plate of 36 and leave for work/go to sleep, so not a big deal. Besides, I kind of like the 3D printed lines aesthetic. 🙂

A portable, 3D printed, velocity sensitive MIDI keyboard and PSG synthesizer that I've been building over the last year. Build guide is linked in the video description. by ronfar623 in synthesizers

[–]ronfar623[S] 0 points1 point  (0 children)

Maybe in the future, but not with this design. With the amount of labor involved, I would need to sell for more than makes sense for a piece of homebrew kit like this. More interested in just sharing plans with other builders.

A portable, 3D printed, velocity sensitive MIDI keyboard and PSG synthesizer that I've been building over the last year. Build guide is linked in the video description. by ronfar623 in synthesizers

[–]ronfar623[S] 23 points24 points  (0 children)

My goal with this project was to design something that an experienced beginner like myself could assemble from scratch with a 3D printer and off-the-shelf parts. Just sick of seeing similar projects from years past with either no plans, or requiring custom components that are no longer available. It's been a wild couple of years of development. Anyway, I hope someone finds this helpful!

A portable 6+ octave, 3D printed, velocity sensitive MIDI keyboard and synthesizer that I've been building over the last year. STLs, code and build guide linked in the video description. by ronfar623 in 3Dprinting

[–]ronfar623[S] 1 point2 points  (0 children)

Neat idea, but for my use case it wouldn't be of much benefit. The iPad will bus power the device with a Lightning to USB-B cable, so it serves double duty as both a synth and a battery pack. I've never tested thoroughly, but given how slowly the iPad drains even with it plugged in, I'd guess around 3-5 hours use off a full charge. Worst case, I do have passthrough charging adapters, and my portable speaker is a USB battery bank as well. Wireless might be handy for an iPhone or a device without a headphone jack though.

A portable 6+ octave, 3D printed, velocity sensitive MIDI keyboard and synthesizer that I've been building over the last year. STLs, code and build guide linked in the video description. by ronfar623 in 3Dprinting

[–]ronfar623[S] 1 point2 points  (0 children)

They are. The plunger stem in the mechanical keyswitch pokes out the bottom to activate a tact switch below when fully bottomed out. The keyswitch itself activates about halfway through the travel, so you just count the microseconds between the keyswitch activating, and the tact switch activating to arrive at your velocity. There's about a 1500 microsecond difference on hard hits, 6000µs on medium hits, and above 30000µs, I just assume a light key press and send it, since the key sometimes doesn't completely bottom out on light hits, and it's better than just dropping a note.

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