RE: [ComputerVoltageSources] Power Supply Connections
2006-03-15 by John Loffink
Good point. Here s what could be supported based upon PCB stuffing options: Synthesizers.com 6 pin 0.100 MOTM/Blacet 4 pin 0.156 add 5 V regulator MOTM 6
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Re: Power Supply Connections
2006-03-15 by mate_stubb
What about modcan and wiard - do they get any power supply connector love? Moe
Power Supply Connections
2006-03-15 by Larry T.
I would like to suggest that, if at all possible, we include both the Blacet/MOTM 4 pin +/-15v power connector. and the Synthesizers.com +5/+/-15v 6 pin
RE: [ComputerVoltageSources] Re: LCD support
2006-03-15 by John Loffink
Dave, You re right. I was basing availability on Atmel s Find Distributors link for the Attiny2313, which erroneously shows only Arrow and All American.
Re: LCD support
2006-03-14 by djbrow54
The Atmel web site shows it as current production. Digikey has 3500 in stock. Dave ... the ... be much
Re: LCD support
2006-03-14 by djbrow54
My 2x20 LCD is spec d at 4.1 volts at a max of 260 mA. I run it with a 68 ohm series resistor. Assuming a constant 4.1 volts, that s only 13 mA. It s plenty
RE: [ComputerVoltageSources] Re: LCD support
2006-03-14 by John Loffink
Correction. We need about 160 mA at 5 V, or 800 mW, and regulator should be specified well above that. LM341 is $0.60 from Digi-Key. TO-220 package, up to
Re: LCD support
2006-03-14 by djbrow54
We need to get an LCD module and see what a reasonable backlight current is. I ve not used one yet at the full current spec. I can buy one from Mouser. I
Re: LCD support
2006-03-14 by djbrow54
The ATMEGA8 would be my second choice. I ve used it for other projects. I ll have to look into availability for the ATTINY2313. It s my favorite part. I ll
RE: [ComputerVoltageSources] Re: LCD support
2006-03-14 by John Loffink
Forward voltage on the backlight is 4.2 volts. It must have LEDs in series. Forward current is 160 mA. Power dissipation for backlight from +15V is (15 V -
RE: [ComputerVoltageSources] Re: LCD support
2006-03-14 by John Loffink
Attiny2313 availability is limited, only Arrow and All American at the moment. Should we go to a more common 28 pin part? Cost wouldn t be much more, maybe
Re: LCD support (vapid cheerleading)
2006-03-14 by drmabuce
nomenclature conventions! YAY!!!!! keeps those pesky angels from dancing on the head of our pin (and the resultant circular discussions) Hear hear! John, Good
Re: LCD support
2006-03-14 by djbrow54
Fine. A couple of notes. The Samsung controller is compatible with the Hitachi controller so this means all of these parallel LCD Assemblies will be
Re: Input Flavors - success!
2006-03-14 by djbrow54
Trigger success! It turns out I read the AtomPro24 datasheet incorrectly the first time. IRQ1 is on P8 which is the AUX input/output. You have to program the
Re: Interpreter Chips?
2006-03-14 by Grant Richter
The schematic is in the datasheet for the Basic Atom Pro 24M module in the files section. It is just an RS-232 voltage level translator for the flash loading
Re: Interpreter Chips?
2006-03-14 by djbrow54
There was some discussion of this in the forum some time ago. What I understand is that this is an interpreter, not a compiler, and so does not have the
Interpreter Chips?
2006-03-14 by Eric Brombaugh
I was browsing around on the Basic Micro site and spotted this: http://www.basicmicro.com/Category.aspx?CategoryID=17 This appears to be bare H83664 chips,
Posting datasheets
2006-03-14 by Grant Richter
I have never heard of any company complaining about posting datasheets for the use engineers working on a design using the products in the datasheets. I am
New file uploaded to ComputerVoltageSources
2006-03-14 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 :
Hardware datasheets in files section
2006-03-14 by Grant Richter
I uploaded the datasheet for the H8 chip used in the Basic Atom Pro. And the data sheet for the Basic Atom Pro 24M. The microcontroller is just chock full of
New file uploaded to ComputerVoltageSources
2006-03-14 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 :
RE: [ComputerVoltageSources] Re: LCD support
2006-03-13 by John Loffink
Oop! Not offlist after all. No matter. If we named these things we d be able to keep them straight. My suggestions, these can just be placeholders: CVS PCB
Re: Input Flavors
2006-03-13 by drmabuce
yeh... what Harry said! I ve been thinking about this too and i endorse Harry s position. In the wild, there s just no right way position every kind of
RE: [ComputerVoltageSources offlist] Re: LCD support
2006-03-13 by John Loffink
Dave, Just to be clear as to how I see this: CVS custom PCB contains the BASIC ATOM PRO LCD custom PCB contains the ATMEGA microcontroller with your code LCD
Re: [ComputerVoltageSources] Re: Input Flavors
2006-03-13 by Harry Bissell Jr
I d say its a bad idea to rely on some minimum or maximum trigger length... I ve seen sub-millisecond triggers... and some much longer. If you get into
RE: [ComputerVoltageSources] group administrivia: file uploads
2006-03-13 by John Loffink
Done. Lumex LCD links posted. http://launch.groups.yahoo.com/group/ComputerVoltageSources/links John Loffink The Microtonal Synthesis Web Site
Re: LCD support
2006-03-13 by djbrow54
A couple of thoughts. First, the LCD microcontroller should be on the same PCB as the display. This allows changes to support a variety of displays and
Re: Input Flavors
2006-03-13 by djbrow54
I probably started this and I m having second thoughts. The issue with stretching the pulse is that you want to detect a trigger only once. So, having
Re: Input Flavors
2006-03-13 by Grant Richter
It seems like we could just put a simple RC pulse strecher on the triger input. That should allow enough time for detection with a software scan. There is
Re: LCD support
2006-03-13 by Grant Richter
A complete MIDI interface will be on the main board. As I understand it, the LCD display microcontroller monitors the MIDI data stream looking for a SYSEX
group administrivia: file uploads
2006-03-13 by data2action
to share files like data sheets that are available elsewhere on the net, consider posting links to those files (in the links section--you can make folders if
Re: A heretical question
2006-03-13 by djbrow54
... I m not going to argue either way. I added it to my PSIM because I had two unused pins that weren t commited. I haven t figured out much to do with it as
Re: LCD support
2006-03-13 by djbrow54
Thanks for the link. I had found the Samsung controller chip but missed the character font summary. The short answer is 5x7, 8 programmable character cells,
A heretical question
2006-03-13 by David Cornutt
Okay, it s a heresy, but someone s gotta ask: Does the Speakjet really belong in a module that is otherwise dedicated to being a control voltage processor?
RE: [ComputerVoltageSources] Re: LCD support
2006-03-13 by John Loffink
Lumex Samsung controller LCD spec: http://www.lumex.com/technotes.aspx John Loffink The Microtonal Synthesis Web Site http://www.microtonal-synthesis.com The
Re: LCD support
2006-03-13 by djbrow54
... The backlights for these LCD controllers do take a lot of power. My first display was a VFD which took 400 mA of +5!!! My 8x2 takes about 70 mA of +5. I
RE: [ComputerVoltageSources] LCD support
2006-03-13 by John Loffink
One more thing, some mounting holes halfway across the main board would be nice for stacking half sized accessory boards, like an LCD microcontroller. John
New file uploaded to ComputerVoltageSources
2006-03-13 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 :
New file uploaded to ComputerVoltageSources
2006-03-13 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 :
[ComputerVoltageSources] LCD support
2006-03-13 by John Loffink
... Backlight is 160 mA. Sounds like the 4 pin interface means the LCD microcontroller is on another board. ... Dave s proposal assumes a simple 2 wire serial
Re: [ComputerVoltageSources] Re: Trial Faceplate Layout
2006-03-12 by harrybissell
Hmmm... The LCD display chosen should probably have its own micro and drivers on board. The only downside is that ties you to a smaller number of displays.
Re: [ComputerVoltageSources] Re: Trial Faceplate Layout
2006-03-12 by harrybissell
A 4 x 6 PCB should come in at way under $50 unless its necessary to use a four-layer board. It would be best to avoid that from a hobbyist standpoint, they
RE: [ComputerVoltageSources] Re: Trial Faceplate Layout
2006-03-12 by John Loffink
So would the LCD microcontroller and drivers be placed on this PCB, or expected to be attached externally? John Loffink The Microtonal Synthesis Web Site
LCD display and Magic Eye Tubes
2006-03-12 by Grant Richter
RE: LCD display 4 pins would be Ground, TXD, Reset amd +5 volts, is that correct? The voltage regulator is only a TO-92, don t plan on powering the LCD if it
Re: Trial Faceplate Layout
2006-03-12 by Grant Richter
The Blacet mechanical scheme will work for the most mechanical formats (PC board 90 degrees from panel). You can always mount the board parallel to the
Re: Trial Faceplate Layout
2006-03-12 by Grant Richter
OK, consider it done. There will be mounting holes on the long vertical edge of PCB for the MOTM bracket.
Re: [ComputerVoltageSources] Re: PCB layout
2006-03-12 by john mahoney
... From: djbrow54 ... No kidding, that would look amazing! (Power consumption be damned. Think of them as VCO heaters! ;-) -- john
Re: PCB layout
2006-03-12 by djbrow54
Two comments. First, I d go with a 4 pin interface. I think there should be a ground and it would be nice to tie the resets together. You can do them
Re: [ComputerVoltageSources] PCB layout
2006-03-12 by john mahoney
... From: harrybissell ... Sure thing. Good to see you here, in any case. ... Awesome! ... Yep. ... Yep, again. But I m sure we ll reach consensus. (Meaning
Re: [ComputerVoltageSources] PCB layout
2006-03-12 by harrybissell
I m getting up to speed on the concept. The PCB should be no problem for me. We just need to agree on a hardware design, and a basic board size. I m sure not