17 Reply by droffset

(469 replies, posted in Graphics, Artwork & Design)

I'd be up for a challenge sometime as well.

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18 Reply by droffset

(20 replies, posted in Circuit Bending)

Those YM series chips are in lots of things from old keyboards to arcade cabinets. I found a Ym2163 in a couple of old noname keyboards.  Datasheets for ym2149 and ym2151 are available from datasheetarchive.com .

This link might help somehow:
http://www.vorc.org/text/column/hally/ymxxxx.html

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19 Reply by droffset

(20 replies, posted in Circuit Bending)

Absolutely do what would be an interesting challenge for you.  People will like it whatever it is.

This looks interesting, there are lots of sampler type kits around.  Maybe it can have a musical use.
http://www.hobbyengineering.com/H1730.html

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20 Reply by droffset

(20 replies, posted in Circuit Bending)

I like the sound chip idea, maybe you could explore something like this?  BU8793KN-E2-ND 

The SN-Voice is a cool project. Unfortunately the SN sound chips are a bit hard to get a hold of.
(EDIT I'm not suggesting offering copies of Thomas Henry's kit, just saying the chip is interesting and TH's implementation is masterful.)

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21 Reply by droffset

(10 replies, posted in Other Hardware)

Thanks that makes a lot of sense.  It's common advice among DIYers to place that capacitor in the output of audio circuits.

I'm wondering why the prosound mod would bypass the amp then?  why not just cut the trace for the HPF and wire it directly to the jack?  (I haven't looked at the mod instructions more than once though.)

There are some good simple bass boost circuits out there by the way.

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22 Reply by droffset

(10 replies, posted in Other Hardware)

Awesome thread!  Thanks Scienceguy for the info.

µB wrote:

Let's start with this DMG wave (lifted from H.Weixelbaum's page):

The squares don't have a flat top, but fall off. My guess would be a decharging capacitor? There are also spikes on the voltage flips, how are these caused?

I have a limited understanding of the math and physics involved but I've seen this waveform in some of my DIY stuff.  That kind of falloff does look like some kind of capacitor discharge at or near the output or something to do with load at the output, maybe even the speaker is bringing it down.  They're calling it Low Frequency Roll off.

Maybe changing the speaker would change the wavform, that's an interesting idea...

Some links that might shed some light:
http://www.machrone.net/mt/archives/202 … phs_a.html
http://commons.wikimedia.org/wiki/File: … charge.svg
Figure 10 @ http://www.eal.gr/english_language.htm
http://users.tpg.com.au/users/ldbutler/Waveforms.htm
http://ap.com/kb/show/187
http://diyaudioprojects.com/Tubes/6T9-Tube-Amp-Kit/

I think Low Frequency Roll Off is a great name for an album, hehe.

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23 Reply by droffset

(106 replies, posted in Trading Post)

Here are some ideas that could be interesting:

-Dissect old microprocessor based keyboards to figure out their sound chips and commands.  For example, I have one that uses a YM2163 but it's hard to find datasheets for it.  Or if there's a standard way to send address/data commands on keyboards sell a device that can send custom commands in the proper format.  Like an "old keyboard posession machine" heh.


-Or take more accessible sound chips(ym2149) and make interfaces with a ZIF socket so you can pop in the chip and make it do things with pots and switches. 

-Maybe find a use for old microprocessors, I've got some old 8032 and z80 that would be cool to make use of.  I currently just blast random bits into an 8032, sum the outputs and listen to it through an amp.

Anyway, just some ideas.

EDIT  here's another idea:

-Do a device that makes salvaged matrix style button setup easy to use.  For example I ripped out the control panel of an old music keyboard and it has a numberkeybad and some buttons for selecting voices, etc, using matrix setups.  It would be cool to repurpose those somehow as a HID or MIDI device.
examples :
here

EDIT2
Speaking of which, it would be great to take any music keyboard with that matrix setup, connect the 16 wires into something and turn it into a midi controller. wowza.

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24 Reply by droffset

(1,620 replies, posted in General Discussion)

Here's mine, mostly DIY stuff, things waiting to be bent, various toys. More stuff in storage waiting to be bent.
I have three gameboys but no carts yet, plus a PSP with LSDJ, but they aren't in the shots, which is ironic since they're the reason I took the pictures in the first place.

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25 Reply by droffset

(106 replies, posted in Trading Post)

I want one of these, gahhhhhh need money.

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26 Reply by droffset

(469 replies, posted in Graphics, Artwork & Design)

Great idea!

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27 Reply by droffset

(96 replies, posted in General Discussion)

The license fees for all of those DC and Marvel logos are probably going to cost a lot.  Not sure how that works.

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28 Reply by droffset

(186 replies, posted in General Discussion)

http://soundcloud.com/droffset

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29 Reply by droffset

(14 replies, posted in Collaborations)

I'd be interested in trying something, when is the deadline?

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30 Reply by droffset

(36 replies, posted in Other Hardware)

Are those Klee sequencer Panels?  I have the full parts kit for one and just need to get my panel components together.

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31 Reply by droffset

(152 replies, posted in Collaborations)

Missed this thread,  I'll submit something.  I don't have any of the tools you list though, just homemade stuff.  Any excuse to record though.

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32 Reply by droffset

(36 replies, posted in Other Hardware)

You work fast, I only got a third of my pcb wiring done last nigt, hehe.

I can't remember where I saw the idea(somewhere on EM) but I've started using ethernet cables as wiring harnesses.  You get 8 stranded wires in a nice plastic casing that can be split just enough to reach the pcb.  I'll take a picture of it next to the same type of pcb with regular stranded bowl of spaghetti/cluster fuck wire.  Feels a lot tidier but we'll see how it sounds, that's the true test.

That Doepfer project is sweet by the way, I want one.

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