Trial Faceplate Layout
2006-03-10 by Grant Richter
I guess we could add the option of a slew limiter for each ouput. If you want, populate the board and wire you jacks to a differnt set of ouputs. That will add
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Re: Software framework
2006-03-10 by djbrow54
Good point. It would be an excellent opportunity to talk about libraries and such. Alas, I had the same experience with include as I did with C. I can t get
Re: programming languages
2006-03-10 by Gary Chang
... Well, then, I am constantly patching a SLEW to smooth the output of the PSIM - I get a faint zippering when it is an LFO, controlling JAG-VCAs for
Software framework
2006-03-10 by Mike Marsh
Hi All - We have been discussing the hardware architecture to some detail here (which is good) but what about the a software architecture/framework/toolkit? A
Re: programming languages
2006-03-10 by Mike Marsh
This was my experience, too :( though I only spent about half a day trying it. I m not sure in this environment whether C would create code that was any
Re: programming languages
2006-03-10 by drmabuce
Hi Chris ... not at all! in fact, one of the reaons i m riding these threads so hard is that NOW is the time to brainstorm these issues , and get on with it
Re: [ComputerVoltageSources] Re: programming languages
2006-03-10 by xamboldt
This may be drifting a little OT, but I m wondering why you couldn t just wire the 10V source to the normalling lug of the input jack, and then wire the tip
Re: [ComputerVoltageSources] useful input structures and not so useful input structures
2006-03-10 by Andrew Scheidler
There are 3 modules I use regularly on the Input side of my PSIM: Blacet VC LFO - running at high speed, the 0~10v waves are great as a random voltage source.
useful input structures and not so useful input structures
2006-03-10 by drmabuce
Hi All ... have full synthesizer style ... channel. Plus calibratable ... and interface 1 volt per ... I built this type of input structure for my PSIM and
unipolar? bipolar?
2006-03-10 by john mahoney
Speaking of input and outputs: We re dealing with unipolar signals, correct? 0 to ~10 volts. John Lofflink had made a suggestion regarding an output level
inputs and outputs (was Re: programming languages)
2006-03-10 by john mahoney
... From: djbrow54 ... Sheesh... I knew that! Bad shorthand. [Slaps self on wrist.] I want what you have. (Thou shall not covet thy
Re: programming languages
2006-03-10 by Grant Richter
That is how I have my PSIM setup now. It works fine for the most part. Since we are spinning a new board, I think it would be useful to have full synthesizer
Re: programming languages
2006-03-10 by djbrow54
... Mine are not input attenuators. They are 0 - 10 volt controls sourced from a regulator and normalled to the inputs. With no input plug the controls
28 or 6 to 40
2006-03-10 by john mahoney
... From: Grant Richter ... version of the Basic ... The 40-pin Basic Atom (non-Pro) could be useful where additional I/O is more important than the higher
Re: [ComputerVoltageSources] Re: programming languages
2006-03-10 by john mahoney
I like the way this is shaping up: BasicATOMPRO, naturally! (Been there, done that.) Optional display, yes! Optional MIDI, yes! Input attenuators, yes! Careful
Re: LCD Display Options
2006-03-10 by Grant Richter
I think the display sharing the MIDI port via a sysex strig is VERY clever. It also allows a very simple two pin interface on the main board. A more serious
Re: programming languages
2006-03-10 by djbrow54
I m waiting for someone to suggest FOCAL. Anyone here that old? Probably could still write it. Dave
LCD Display Options
2006-03-10 by djbrow54
Just spent some time on the phone with John Loffink discussing the various display options. To summarize, I think there are three basic parameters that need
Re: programming languages
2006-03-10 by djbrow54
I probably spent a day trying to get the C environment working. I don t remember all the issues but I got nothing working. I posted a note on the BasicMicro
Re: programming languages
2006-03-09 by Grant Richter
There are two versions of the Basic Micro development software. One says something about a C compiler. Anybody know what is up with that? If we can use both
Re: LCD
2006-03-09 by Grant Richter
Hi Dave, Sounds great. How about if we put a connector on with TXD and ground in paralell to the MIDI hardware? The you could just hang the display on that
Calibrated Inputs
2006-03-09 by Grant Richter
Hi Gary, Already got you covered on this one. The original problem was the inputs were scaled to only approx. 10 volts. The internal A/Ds are ratiometric to
Re: programming languages
2006-03-09 by drmabuce
Hi Mike ... (uff da! YA!*) me too but without going TOO far OT...(i hope).... in all fairness to the few and the proud.... i have seen some miracles of rare
Re: programming languages
2006-03-09 by Mike Marsh
Ah, Forth, the write-only language :p I once wrote a drum machine in Forth on a VIC-20 (still have it) but went back to add triplets a couple of months later
Re: LCD
2006-03-09 by djbrow54
It depends. This is where I started. I had a really nice serial VFD display. I figured out how to use the S_OUT pin for an extra output and interfaced this
Re: Hardware thoughts
2006-03-09 by djbrow54
I have no issue with the accuracy of the input sampling. It took me a while to figure out that the scaling was different. The reference for the input is 10
Re: Hardware thoughts
2006-03-09 by Gary Chang
... original to the DAC7714 ... surface mount where ... piece. Probably put a ... in 1.2 millisecond. ... I want to bring up an issue that was uncovered in
Re: programming languages
2006-03-09 by drmabuce
Hi John ... quicker, but ... LOL!!!!! LOL!!!! again! that s a good one! i can t believe i missed that one! -doc
Re: programming languages [forth]
2006-03-09 by drmabuce
hi bbob ... LOL me neither!!! i had Forth CARTRIDGE for my C64 s ...in fact i don t think my headache subsided until about 1992!!!! (and then my kid was
Re: [ComputerVoltageSources] Re: LCD
2006-03-09 by Eric Brombaugh
Matrix Orbital is popular with the PC case modding crowd and has a wide variety of serial LCDs in the $50+ range:
Re: LCD
2006-03-09 by Grant Richter
There is not guarantee that any of these parts will be available in the future. Or any through hole parts. There has always been a very small window of
Re: Hardware thoughts
2006-03-09 by Grant Richter
In signal to noise terms, it is 6 dB per bit (6 dB is an octave in dBv) So 12 x 6 = 72 dB S/N, about 20 dB better than magnetic tape.
Re: Outputs
2006-03-09 by Grant Richter
OK, My bad, dropped a digit. 0.0833 x 128 = 10.6624 volts For Microtonal work you can always rescale the DAC reference to a smaller output range. I guess we
Re: Reference Platform?
2006-03-09 by djbrow54
I got a good email from a group member that convinced me how complicated all of this is and the need to simplify. As such, I have removed the commercial
RE: [ComputerVoltageSources] LCD
2006-03-09 by John Loffink
It is true that you can get a bare bones 8x2 or 16x2 LCD for $10 or less. It is the support circuitry that adds the cost. Add backlighting (recommended) and
RE: [ComputerVoltageSources] LCD
2006-03-09 by Eric Brombaugh
LCDs aren t too expensive - typically $5 - $10. For example: http://www.allelectronics.com/cgi-bin/category/365/LCDs_(Liquid_Crystal_Displays).html Eric ...
RE: [ComputerVoltageSources] Digital I/O
2006-03-09 by John Loffink
I agree that added digital I/O is good. Why waste ADCs and DACs on gate signals, for instance? John Loffink The Microtonal Synthesis Web Site
RE: [ComputerVoltageSources] LCD
2006-03-09 by John Loffink
I like the LCD idea too, but it could be fairly pricey as an add on. At a minimum I think a two digit numeric LED display would help. For instance, in a
RE: [ComputerVoltageSources] Re: Hardware thoughts
2006-03-09 by John Loffink
Low pass filtering or linear slew on the outputs could reduce zippering effects. I ll have to try the sine/cos out on my Frequency Shifter which are 12 bit
RE: [ComputerVoltageSources] Outputs
2006-03-09 by John Loffink
For a 12 bit output, that s 4096 steps in 10.625 volts full scale, or 2.59 mV per step. A semitone is 1V / 12 = 83.33 mV. So that should be 32.17 steps per
RE: [ComputerVoltageSources] DACs
2006-03-09 by John Loffink
The TI DAC7614P is a 16 pin DIP second source part for the DAC8420. It is $16.47 from Newark. John Loffink The Microtonal Synthesis Web Site
Re: programming languages [forth]
2006-03-09 by data2action
ummm, forth... hadn t thot about it for a while, but there was polansky & burk s HMSL (hierachical music specification language) written in forth, and i think
programming languages
2006-03-09 by john mahoney
... From: drmabuce Subject: Re: Microprocessors in analog modules [snip] ... As one wag put it, lower level languages give you the
Re: [ComputerVoltageSources] Re: Microprocessors in analog modules
2006-03-08 by Michael Zacherl (aka TonTaub)
Hi there, my posting obviously was a bit misleading: I m just pondering over digital interfaces other than MIDI, USB, RS232, etc. It s not my intention (for
New to Group
2006-03-08 by yahudinyhwh
Hi all, I just joined the group. I m Scott Evans and have been a member of several DIY synth groups over the years as well as on the MOTM list. Besides being a
Re: Microprocessors in analog modules
2006-03-08 by drmabuce
Hi Michael ... http://www.smartcontroller.com.au/smartController/smartController.html ... these are good topics to keep in mind.... MBASIC code is not going to
Re: Posting code
2006-03-08 by drmabuce
Hi Mike here s my opinion... if it s ALL public domain, simple attribution in a comment line ie: * LOADALLDACS courtesy of Grant Richter is sufficiently
Re: Microprocessors in analog modules
2006-03-08 by Mike Marsh
I m going to check this out; it looks mighty interesting...
Posting code
2006-03-08 by Mike Marsh
Thanks to all that replied regarding posting code here. I will probably post at least one program, since it is modular and can be easily modified to provide
Re: [OT] RSS
2006-03-08 by Mike Marsh
The moderator or owner of the group has to turn it on. The MOTM group does and those few others I mentioned... ... archives ... have ... such. ... until we