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2006-03-17 by John Loffink
I see no impediment to supporting both. John Loffink The Microtonal Synthesis Web Site http://www.microtonal-synthesis.com The Wavemakers Synthesizer Web Site
2006-03-17 by John Loffink
Agreed that Dave s MIDI input idea is ingenious and saves data entry interfaces on the panel. John Loffink The Microtonal Synthesis Web Site
2006-03-17 by John Loffink
I wouldn t mistake a healthy exchange of ideas as difficulties. It should be no problem to support the LCD as an addon accessory, or not, depending on your
2006-03-17 by Grant Richter
Works for me. Next question, each CV input takes two op-amps. Do we use 8 dual op-amps, or 4 quad op-amps? The will need to be two differnt BOMs for 10 volts
2006-03-16 by john mahoney
... From: Harry Bissell Jr ... To paraphrase Maxwell Smart, I told you not to mention that. Talk to the chip, via the shoe phone. ;-) -- john (missed it by
2006-03-16 by xamboldt
I humbly defer to Dave & Grant s opinions, speaking as people who already have SpeakJets hooked up to their PSIMs, that the additional I/O would be more
2006-03-16 by Harry Bissell Jr
YOU mentioned the SpeakJet ??? Please have it ridicule you, on my behalf... :^P Talk to the chip, the hand is tired... H^) harry (yes to more I/O, no to
2006-03-16 by john mahoney
... I d much rather have 8 ins and outs. (Forget that I ever mentioned the SpeakJet. ;-) A writeable store would be fabulous, too. Optional would be even
2006-03-16 by Henry Till
On Mar 16, 2006, at 3:04 PM, Grant Richter wrote: This may come at the expense of some digital funtions. I may have to sacrifice a pin for chip select. Are we
2006-03-16 by djbrow54
... Nice update on the AtomPro24. ... I have a SpeakJet on my PSIM and I have failed to ever find a real use for it. It s fun but a pain to program. Also,
2006-03-16 by drmabuce
Hi All design by comittee is always a mess , and frankly we re doing pretty well compared to some so-called professional committees i ve seen... but... the
2006-03-16 by Grant Richter
Hit unwrap lines above so this doesn t look jumbled. OK, to clarify the difference between Basic Atom Pro 24M and 28M. The pinouts are the same as far as
2006-03-16 by Grant Richter
I have to say again Dave, that MIDI SYSEX trick for the display is just brilliant.
2006-03-16 by Gary Chang
drmabuce wrote: i m not deeply commited to the ... FWIW, I have to agree with those who have expressed the opinion about the relative
2006-03-16 by drmabuce
Hi All i m responding to several of you LCD boffins at once here. I ll try to keep it all straight In general thanx for the consideration. i m not deeply
2006-03-16 by djbrow54
I just added an AtomPro programming FAQ to my files section (Files BasicAtomPro Original PSIM Dave Brown). I ve started documenting all of the nuances
2006-03-16 by djbrow54
... I believe it will be fully optional. ... That s how I started. Where a display really helps is setting input controls. For example, one program uses a
2006-03-16 by Andrew Scheidler
I ll volunteer to write a subroutine that will translate messages to Morse code and transmit them via an LED =o) I m with Bob on the spartan end. Hopefully
2006-03-16 by data2action
feeling very much like the good dr. (in terms of following the threads as best i can, lacking expertise, etc), and with similar caveats (just ignore me if i m
2006-03-16 by djbrow54
As John has mentioned, you can t or MIDI input data. You have to parse it to commands, convert running status back to full commands, and interleave new MIDI
2006-03-16 by djbrow54
The backlight is on a separate connector. I think we can run the backlight at very low current. I am running a 20x2 backlight at 18 mA, far from the spec of
2006-03-16 by John Loffink
Doc, No problem making the suggestion. A free flow of ideas is good. Here are a couple of considerations that I see: 1. Dave has already allocated all pins
2006-03-16 by John Loffink
Hmmm, I missed that since it is only on the web page description. It would be nice if they published the spec for the 28M device, since they are selling it.
2006-03-16 by Grant Richter
If you look at the Basic Atom Pro 28M description, it mentions adding 32K of EEPROM on the carrier board, included in the price.
2006-03-16 by Grant Richter
The advantage of a forum like this is, of course, thart you are free to use any information here for your own PC board design. I will be interested to see the
2006-03-16 by John Loffink
Looking at the 3664 Spec more closely, use of the BASIC Atom Pro Flash in a run time environment requires use of the User Program Mode. This requires running
2006-03-16 by John Loffink
The BASIC ATOM PRO s Renasas 3664 processor has 32K of Flash, but it is only rated at 1000 write cycles. Storing user data there isn t recommended. We d have
2006-03-16 by John Loffink
It would be better to adapt a hot plug type controller based upon +/- 15V power and FET to the task than a relay, but even that is going to extremes. I am not
2006-03-16 by Larry T.
Would it be possible to use a small pc mounted relay to connect/disconect the +5 and Vref based on +15 being present? That way loss of +15 protects the part?
2006-03-15 by Grant Richter
The note on power supply sequencing is on page 12 of the DAC8420_a.pdf file. They say it can take some milliseconds of fault condition, but not how many. I
2006-03-15 by ComputerVoltageSources@yahoogroups.com
Hello, This email message is a notification to let you know that a file has been uploaded to the Files area of the ComputerVoltageSources group. File :
2006-03-15 by Grant Richter
On the CVS board, we have to have control of power supply sequencing to prevent blowing up the expensive DAC chip (see the datasheet). The +5 and Vref supplies
2006-03-15 by Larry T.
If you only want to supply pads, thats okay, but PLEASE supply the pads, polyswitches and diode locations for all 3 voltages. It should be very easy to make
2006-03-15 by drmabuce
Hi All (especially John, Dave, Eric & any other LCD enthusiasts) first off, please feel free to tell me to [insert favorite euphemism for consume feces and
2006-03-15 by Andrew Scheidler
I ve written several sequencers for my PSIM, and for a time spent a lot of hours trying to find a way to allow the program to store information onboard. For
2006-03-15 by John Loffink
That s junction to ambient temperature rise. Case temperature will be 8-9 degrees less at this amount of power. Case temperature of 43 degrees Celsius, for
2006-03-15 by Harry Bissell Jr
Grant Richter wrote: Just a few observations, please nobody get offended. Specially Harry who is a kick ass musician, top notch
2006-03-15 by Harry Bissell Jr
Damn good idea. The polyswitch fuses can also improve on-card power supply filtering (by being slightly resistive) and cause a softer start on the power
2006-03-15 by John Loffink
It is true that a TO-220 will allow us to more safely dissipate heat even if we re not using all the current generating capability. 78L05 (296-1365-1-ND) in
2006-03-15 by Grant Richter
Here is a practical idea. You have three pads labeled +V, Ground and -V. These go to resetable polyfuses and 1N4001 diodes to protect the circuitry in case the
2006-03-15 by Grant Richter
Just a few observations, please nobody get offended. Specially Harry who is a kick ass musician, top notch engineer and all around fine fellow. 1. The Basic
2006-03-15 by djbrow54
I pulled my modular LCD apart and measured the backlight current. I am running at 18 mA. It s of average brightness, certainly easy to read but not overly
2006-03-15 by djbrow54
Found a couple of more registers to control irq s. I can now select the inputs for rising or falling edges. I can also clear extraneous inputs for an active
2006-03-15 by harrybissell
OK lets do the math (check my figures) 78L05 has 100mA with suitable heatsink and with short leads to a PCB... 160C/W junction to ambient. Max junction temp
2006-03-15 by John Loffink
Dave has proposed testing the actual LCD as his experience is that much less current is required for the backlight than specified. A 78L05 is specified to
2006-03-15 by harrybissell
I suggest a big wish list, then pare down to the amount that will fit on the PCB size you want without making the density too high. Really high density will
2006-03-15 by John Loffink
Synth circuits use 78L05s all the time: MOTM, CGS, etc. What do you propose? Not all systems have 5 volts. Why make users build messy harnesses or adapters
2006-03-15 by John Loffink
7805 or 78L05 regulators can take either +12 V or + 15 V and give 5 volts out. What s +/-12V other than Wavemakers? :-) John Loffink The Microtonal Synthesis
2006-03-15 by harrybissell
IMHO trying to make 5V from 15V with an onboard linear regulator is a loser. The power dissipation is going to be so high you are just installing a space
2006-03-15 by john mahoney
Any allowances for +/-12V systems? Doesn t matter to me, personally, but it s worth mentioning. Looks to me that the specs are firming up nicely. This group is