moebius
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Posts posted by moebius
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Uh,
I just searched the subject in this very forum. Found some info. No schematics, thought.
Moebius
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Hi ya!
Sorry for me bad enklish.
Solder taps are the spots to solder on.. Usually round and with hole in the center :D I´m sorry, I´ve made a board with previous layout and the legs for the rectifier needed bigger drill. There wasn´t much space to solder there.
Cap Ys are for life.. Plain and Simple; "How Do You Do" :D
I hope You´ll get the Braid.. :D
Moebius
p.s. You are doing fine!
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vX.
It´s been referred to. Many times. No code seen. It might even be ready. Sometime. Hi. He. I´m so sick. I have some much work. I have a flue. He he hee!
Well, vaporware it is.
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Monome clones.
If Monome was lame, Midiboxers clonin´it was probably even more lame? "Hey, Midibox Lemur - Just if I pay ya?"
Moebius
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This is where You tell who did and what didn´t happen. TK just DID IT - Get it?
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Why should You get any cover for SL1200´s? No laptop hurts those.
Moebius
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Well,
I´d rather try Dynebolic. As always, they offered a Live-CD, but I didn´t find Live anywhere.
It´s like Midibox. You can´t find vx even if You wanted to. Only references.
Moebius
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Welcome!
If You don´t have a desoldering pump - I´d rather say, get a solder wick (braid) instead. The work You have done is excellent, don´t let people destroy what You´re doing.
Didn´t Your board have a proper solder tap?
Moewbius
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That seems a pretty good price for the specs! Pity about the tiny pins but maybe it's workable?
You can be the beta tester!
Cascadeable serial - does that mean it can be fed from one/two PIC pins?
2-3, Just check the datasheet out.
16 channels would be a bit overkill and if all 16 channels get their OpAmps etc., everything wouldn´t fit onto a 80x100 mm board. Could the opamps be moved to another board? Or some of them? IE a 4 or 8 channel implementation with optional plug in opamp board?I don´t know. 4 x SOIC OpAmps don´t cost that much space.
Moebius
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Hi,
Hmm it occurs to me ..what we're dealing with here is an analog data bus addressing analog memory ...how about that :)
"With digital control, to address the drift" - It´s a nice definition!
Moebius
p.s. TK, please save me - what is the update frequency of the current S&H code?
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Hi,
yes, cap thing should work i guess, provided that the charge leakage is very low ..otherwise static signals stored might drift. However i beleive it is possible to prevent this happening with the correct configuaration of negative feedback to stabalise against any really slow drifts.
There are no "static signals" - S&H is constantly updated with current voltage in the DAC output. NJU7304 was pretty good at droop rate of 1mV/5ms.
Of course "low leakege" is needed, but I can´t see reason to use OTA (with hold cap and buffer OpAmp) as analog switches already have MegaOhm off state, so it´s more up to the cap and switching rate to hold the voltage.
Moebius
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Hi,
Using OTAs isn´t an elegant or Cost Effective solution. It´s too bad those NJDs are obsolete. (other available S&H chips I´ve found really aren´t up to the job)
I still think using 4051 multiplexers with a hold cap and buffering OpAmps would be easiest way to go. It´s a cheap solution, but uses pretty much board space.
Moebius
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I just tried:
perl vx and it doesn´t exist! I feel stupid, I´ve used perl before.. even perl vx.pl didn´t work! Is it the path problem?
Moebius
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i am looking for buying that specific encoder as well (EC12E2420802). it is optional pcb mount, right?
All the encoders I´ve seen are PCB mount.
Moebius
p.s. You can use wires and attach the encoder to the frontpanel
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Hi all, cheater
I think the INL error we are concerned about is a static (known) scale error between MIN-MAX values of the dac. (In other words, cheater you are fighting against wrong problem here.)
Moebius
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Yes we do,
but at least I´m too tired to "search the forum" for the answer ;D
Moebius
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Yeah, I understand that, because I own both a Jx3p and a PG200!!
The PG200 looks like it would be pretty easy to homebrew, though I'm not sure if it houses a custom IC.
It has Roland custom mask programmed 8048. I´m not sure if it´s possible to dump internal code even with hacking. But the protocol is most likely pretty simple so as DrBunsen suggests.. data logging and reverse engineering could be "easy"..
I'm actually wanting a PG300 workalike, because i've just got myself a JX8 minus the programmer.
Actually You want a PG800 workalike ;D PG300 is for alphaJunos and MKS-50.
Moebius
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Hi.
Core is from Mikes Midibox shop...
One suggestion: Try disconnecting middle (ground) pin from the core MIDI Out port (J12).
Moebius
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Hi,
You can look the datasheet. Each of the buttons needs a clock and a serial data line. The minimum clock frequency is 50kHz.. To support many buttons it´s pretty resource hungry bit banging effort.
Moebius
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;D
I just hope You end up broking few voices and Alesis service center thinks it´s ok to send You few spares... :P
Moebius
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Hi,
Links copied from the Anal(ogue)heaven mailinglist, (guess who´s banned):
http://www.trippler.net/files/pics/ics1.jpg
http://www.trippler.net/files/pek/board1.jpg
Thanks to Stefan Trippler.
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Alesis Andromeda, close ups, please. It has Alesis custom Asic analogue chips.
Moebius
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Hi,
Rumours tell that those PA397 chips were originally from Tom Oberheims Marion Systems MRS-2 synth. Seen original Evolver circuit board photo with OnChip PA397. Also the OnChip systems owns CEM chip designs.
(quoting) Dave:
"yes; the chip is very close to the Marion. Has 2 oscillators, LP
filter, a few VCAs all on one chip. "
This smells pretty much like 3396. So, oscillators are actually waveshapers.
Pro-one is nothing like Prophet5 for that matter, direct Voltage control versus uC based system with memory.
Moebius
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Cool!
Moewbius ;)
vX
in MIDIbox User Projects
Posted
Nice to see there´s some "proof of the concept" code!
Keep up the nice hype, Stryd!!
Moebius