Archive for September, 2013

September 23, 2013

I need to do something about the theme and appearance of this blog. Uhhhhhh … what kind of things do you want to see on here? Anyone found any themes that are particularly interesting?

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Getting over Myself…

September 22, 2013

OhMyWord!

I’ve been clinging onto my previous blog site, Xanga.com, like a hungry child-calf clings to its mothers teat. Hoping that, eventually, I’d be able to return and enjoy mindless postings of emotional prose and clichéd hopes. I’m finding that dream to be an endless shit-filled pit of never going to fricken’ happen!

I feel I’ve had to change what I write about over here. That the content of what I used to post isn’t professional, isn’t wanted, or is too visible on the purified white backdrop of WordPress. Anything remotely personal, glows reflectively back to my eyes and stings. Basically, It makes me feel petty and immature.

Evolution, I need to get me a ticket on that train!

Over the past few months of transition, the transitional phase. I’ve clutched onto the various, user operated, Facebook groups, to keep up-to-date with Xanga‘s progression. But as is the…

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Steiner-Parker VCF simulated

September 22, 2013

I spent Friday night at my internet-less grandparents, but I still got some work done on simulating some schematics I already had laying around.

I saw this schematic for a filter inspired by the one from the Steiner-Parker Synthacon, and was taken by both its simplicity and its unique design. I haven’t really done a lot of analysis of it, other than that it uses a string of eight diodes as voltage-dependent-resistors to vary the cutoff frequency.

Unlike many multimode filters, each mode has its own input but the filter has a single output. Most filter modules you regularly see have a shared input for each mode, but with separate outputs. This one looks the most similar to a filter topology I’ve seen in school, the SAB or single-amplifier-biquad, but I haven’t really given it an in-depth look.

Anyway, the schematic can be found here. Props to Ken Stone for his work. I might buy some of his PCBs sometime.

I made a crappy sawtooth oscillator (perhaps a post on that later) and then loaded Ken’s schematic into LTSpice, then fed the oscillator output into the filter’s low-pass input. I set up a piece-wise-linear voltage source to drive the oscillator with an eight-step sequence and summed three slow triangle-wave voltage sources to drive the filter’s cutoff. I hard-set the resonance to max–in my simulation this didn’t cause oscillation as Ken’s website noted. *shrug*

Image

Here’s the 64 seconds of synth-filter sound that I coaxed LTSpice into dumping out:

This filter’s squelchy goodness is really remarkable. When I ever get around to buying some CGS PCBs these will definitely be on the list.

Forgetting Xanga

September 18, 2013

Any other Xanga refugees, feel free to follow me. I was the same name there as here.

Forget that place though.

What to Do with a Couple Hundred Electric Motors

September 17, 2013

So, this is pretty cool.

wayneyoshidakh6wz

I came across this sculpture while doing some research on mechanical sculptures. The video is a bit long, but the creations look like a good way to use a bunch of surplus motors. . .  They make a noise that sounds like falling rain or a racquetball court – or – something.

>>>> Click here to see the works made by the artist called Zimoun

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WordPress Tags/Topics

September 17, 2013

The “circuits” topic here on WP is about 50% arduino and 50% fitness. I’m new to ardunio, and it’s fun, but what I’m really into is all analog. The “analog” topic, of course, is about 90% photography and 10% music, but no circuits. “electronics” is pictures of iPhones.

Not to mention, “modular” is less than 5% synthesizers.

So yeah, if anyone sees anyone blogging about non-digital circuitry, lemme know. Still looking for more people to follow.

Or if there’s something about the topic system that I’m misunderstanding.

SesquiAPC Atari Punk Console “mod”

September 16, 2013

This is an idea that I vlogged about approximately a million years ago. I finally built one into a more permanent enclosure.

(Sesqui means one and a half.)

I used something called “dead bug” construction. This refers to gluing components upside down to a surface with their legs in the air, then soldering directly to the legs without a circuit board. It’s kind of like a really crappy quick-and-dirty version of point-to-point wiring, except it lets you use more modern package types that aren’t intended for that.

I made a video demo last night. I currently lack a decent audio interface for recording. Please just bear with the static and crackles:

Here’s a rough schematic. I had to make it from memory… there are probably quite a few differences between it and the one in the video. All of the crossfade resistors are encased in heat-shrink stuck directly to the pot’s legs, for instance. And I can’t read the values on these caps without a magnifying glass, so I just didn’t.

sesquiAPC

Basically, the top 1/3 of the circuit is a narrow pulse oscillator. The first capacitor charges through R1 and R2. When it reaches 2/3 of the supply voltage, the 555 does its magic and lets the capacitor discharge through just R2 until it reaches 1/3 of the supply voltage, then the process starts over.

Every time this happens, a pulse is generated on the “OUT” pin. This pin is connected directly to the “trigger” pin on the 2nd and 3rd 555. These are set up to only let only one cycle occur every time they’re triggered. However, if they get triggered twice (or more) before the the capacitor finishes charging, then they still only output one pulse for all of the triggers that happened in that time.

Basically this means that if the first part is generating a 600Hz pulse wave, the second part is capable of outputting a wave at 600Hz, or 300Hz, or 200Hz, or 150Hz, etc. And the third part does the same thing, but these two frequencies are selected separately, which means that musically useful harmonies can made between them.

The original only has one of these dividing stages. I see a lot of people building TWO of the original in one box together, but it is my opinion that what I’ve done is about 50x as musically interesting and useful as that, and also has less parts.

If you think this sounds interesting enough to make your own, I could try going a little bit more in depth with a how-to. The original APC is one of the simplest things you can build that has a really impressive sound, and my SesquiAPC isn’t that much more involved.

What I’ve Been Up To

September 14, 2013

There are some things I have been doing but I haven’t produced anything visible and fun for you all to look at yet, really. Here’s a list of stuff I’ll be doing that I’ll post some fun from.

School Project: My DIY projects are moving very slowly right now because I have a project for school that takes the same kind of energy. I’m going to be building an Omniwheel RCV for school that will be similar to this one.

Guitar Effect DIY: I have a guitar effect pedal breadboarded, and I have a case ready for it. Populating the board is going to be a pain though, and I doubt I can make a good recording with it still out of the box.

Lofi Synth DIY: I built an Atari Punk Console with some extra functionality that I dreamed up. It has two dividers that run side by side, instead of one, and you can crossfade between them. I have an old video explaining this idea up on youtube but it is long and boring. I made the new one into a Tazo tin and should make a new video of it and post a schematic. Maybe if we’re lucky I’ll get that up sometime tomorrow.

Synth Module Simulations: And also I’ve been simulating synthesizer parts in LTSpice. I recently discovered that it can output audio files, so it’s actually possible to get a good feel for what some of these things sound like. I’ve gotten simulations of about half a dozen of Ken Stone’s designs. The only audio I’ve made worth sharing so far is the one from the Drum Simulator. I uploaded it to soundcloud the other day:

Anyway, those are the directions this blog is going in for now. I’d like to make more cover video-songs but there just isn’t enough time or inspiration. But if anyone REALLY wants to see video-songs then maybe I can do something. I realized some super-boring minimalist phasing music the other day, but it hasn’t exactly gone viral yet:

Well, that’s what I’ve been up to. I still haven’t come up with a new name for myself.

email me: anaraug@gmail.com and tweet at me: @anaraug

Titles and Handles

September 13, 2013

I’m thinking about blogging here on wordpress. I think it might work as an identity transition. As in, I have loved the handle “anaraug” for a long time but if I continue to use it and have it strongly associated with my real name then at some point in the future I might be required to explain things that I posted online over a decade ago. The very first time I used “anaraug” as a handle was on Xanga, and that’s all gone now.

Anyway, I think I can blog comfortably on wordpress titled something like “something (formerly anaraug)” for a year or so, and then drop the formerly. Then maybe switch over every account that uses it.

What I actually want to blog about are diy projects that I do, and possibly a project I’m currently working on for school. Everything is electrical engineering oriented, and most of it is music oriented. But I want to try to write in a way that can appeal to people who don’t know what a transistor is.

So yeah, step one I supposed is come up with a catchy blog title. The blog title I have on blogger “analog anomaly” is already taken as a domain name. The fact that I have had the title formatted as a reference to some old occult group probably doesn’t help my credibility among some. I mean unless I only wanted to sell synths to witch house musicians, maybe.

For step two I want my actual handle to be short, have no numbers, be unique, and somehow suggestive of the kinds of things I’m in to. I could lift a reference from media I guess. *shrug*

Anyway. I don’t have many subscribers so I don’t know why I’m asking you all this anyway. What do you think makes for a good handle and blog title?

 

If you want, email me at anaraug@gmail.com or tweet at me at @anaraug.

fun

September 11, 2013

email me at anaraug@gmail.com

tweet at me at @anaraug

it’ll be fun.