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 Forum index » DIY Hardware and Software » MusicFromOuterSpace.com designs by Ray Wilson
Ultimate Expandotron MFOS + hint of Buchla Photo Build Blog
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robsol
Stream Operator


Joined: Apr 24, 2009
Posts: 1849
Location: Bristol UK
Audio files: 275

PostPosted: Tue Jan 14, 2014 7:30 am    Post subject: Reply with quote  Mark this post and the followings unread

loydb wrote:
Turns out I know this guy. He just forgot to tell me beforehand Smile

It's still a random conversation, but one I'd have been willing to engage with had I known it wasn't from an internet cafe in Shanghai...


Well, he hasn't been banned so he can still use his account here to post if he wants. Smile

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loydb



Joined: Feb 04, 2010
Posts: 392
Location: Providence, RI

PostPosted: Wed Mar 04, 2015 7:02 am    Post subject: Reply with quote  Mark this post and the followings unread

About 2 weeks after my last update, I got laid off. I spent most of 2014 in varying levels of clinical depression where not a lot got done. I'm in a better headspace now, and am working again, and have restarted work on the Ultimate. I'm about 80% done with attaching the flying wires to the panel...

Posted Image, might have been reduced in size. Click Image to view fullscreen.

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elmegil



Joined: Mar 20, 2012
Posts: 1675
Location: Chicago
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PostPosted: Wed Mar 04, 2015 7:20 am    Post subject: Reply with quote  Mark this post and the followings unread

Good to see you back in the saddle. I just finished an Ultimate a couple months ago (for someone else) I definitely don't envy you the wiring Smile
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loydb



Joined: Feb 04, 2010
Posts: 392
Location: Providence, RI

PostPosted: Thu Mar 05, 2015 7:43 am    Post subject: Reply with quote  Mark this post and the followings unread

Yeah, this is really putting me off on flying wires. To the point where I'm probably going to pay someone to wire the sequencer... Smile
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loydb



Joined: Feb 04, 2010
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Location: Providence, RI

PostPosted: Thu Mar 05, 2015 10:25 pm    Post subject: Reply with quote  Mark this post and the followings unread

Allrighty, all wires attached!

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loydb



Joined: Feb 04, 2010
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Location: Providence, RI

PostPosted: Sat Mar 14, 2015 6:28 am    Post subject: Reply with quote  Mark this post and the followings unread

Starting bringing order out of the chaos.

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Skrog Productions



Joined: Jan 07, 2009
Posts: 907
Location: Scottish Borders
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PostPosted: Sun Mar 15, 2015 3:47 am    Post subject: Reply with quote  Mark this post and the followings unread

wiring is great isn't it Wink , I have to have a few short rests during wiring panels just to stop the brain melting Smile .

Dave.

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loydb



Joined: Feb 04, 2010
Posts: 392
Location: Providence, RI

PostPosted: Sun Mar 15, 2015 6:14 am    Post subject: Reply with quote  Mark this post and the followings unread

I can do about 45 minutes, then my neck seizes up and I have to do something else Smile
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loydb



Joined: Feb 04, 2010
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PostPosted: Thu Mar 19, 2015 6:46 am    Post subject: Reply with quote  Mark this post and the followings unread

Finished the braiding.

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loydb



Joined: Feb 04, 2010
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PostPosted: Fri Mar 20, 2015 6:42 am    Post subject: Reply with quote  Mark this post and the followings unread

Ok, time to start figuring out power routing and PCB placement!

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Skrog Productions



Joined: Jan 07, 2009
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PostPosted: Sat Mar 21, 2015 4:47 am    Post subject: Reply with quote  Mark this post and the followings unread

nice silver dials to go with the face panels , looking great so far .

Dave.

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loydb



Joined: Feb 04, 2010
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PostPosted: Mon Mar 23, 2015 6:53 am    Post subject: Reply with quote  Mark this post and the followings unread

Thanks! Sorted out the power location yesterday.

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AlanP



Joined: Mar 11, 2014
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Location: New Zealand
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PostPosted: Mon Mar 23, 2015 7:20 pm    Post subject: Reply with quote  Mark this post and the followings unread

No heatsinks on those regulators?
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loydb



Joined: Feb 04, 2010
Posts: 392
Location: Providence, RI

PostPosted: Tue Mar 24, 2015 6:51 am    Post subject: Reply with quote  Mark this post and the followings unread

It's the MFOS power supply, it doesn't come with any. I'll be ventilating the cabinet, we'll see how it goes.
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Skrog Productions



Joined: Jan 07, 2009
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PostPosted: Tue Mar 24, 2015 11:45 am    Post subject: Reply with quote  Mark this post and the followings unread

Thermal shut down aprox. 45 seconds after loaded power up.

The layout on the mfos power pcb is a bit tight for installing , good , adequate heatsinks when using it for loads of around 100mA to 400mA , that's when we go off the board but there is a certain way to do it......

De-solder the regulators off the board , acquire some 3 core immersion water tank heater flex (1.5mm squ cable size 16Amps rated) , solder the cores of the flex to the pcb and run the wires to the regulators & heatshrink the connections , if you can't get good large finned sinks , use a 6" length of 5mm thick aluminium "L" for each diy heat sink , also get a kit of mica regulator insulators & a tiny thin scrape of heat compound / thermal grease between regulator & heat sink surface before nut & bolting them.

I use a 6mm or 8mm hex nut to distance fix the "L" bars off the wood.

here is a pic of one set of + & - heatsinks from the Orange synth I built.

I have about an inch separating gap between the L bars.

If you need any help give me a PM.


Dave.


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loydb



Joined: Feb 04, 2010
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PostPosted: Thu Mar 26, 2015 11:44 am    Post subject: Reply with quote  Mark this post and the followings unread

Thanks for the pics! I've added a couple of (smaller than those) heat sinks, I'll monitor the heat. Long term, I will have to replace the power supply, as this one will be maxed out with some blanks still left in the cabinet.
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Skrog Productions



Joined: Jan 07, 2009
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PostPosted: Fri Mar 27, 2015 2:00 am    Post subject: Reply with quote  Mark this post and the followings unread

Smile

great , in the pic above i'm drawing 550mA approx. per regulator (1.5A adjustable regs) , the + bar gets warm after a few hours use .

I read through all 7 pages of your build and it seems you will be drawing somewhere around 300mA per regulator (1A - 7812 / 7912) with the modules you have , that's good , regulators seem happiest when running at half or less their max current load while attached to a good heatsink .

The other important thing in this chain is the user purchased wall wart or desktop resin block power pack .
You may find a 1.2A or 1.5A AC wart /power pack to be the ideal choice.

Keep up the great build Smile , I'm looking forward to hearing your sound demos when finished Smile

Dave.

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loydb



Joined: Feb 04, 2010
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PostPosted: Fri Mar 27, 2015 7:19 am    Post subject: Reply with quote  Mark this post and the followings unread

Wait, this stuff makes *sound*? I was just after blinkenlights!
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