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Everything posted by rebeltaz

  1. Hi... I managed to get my latest clock running with a 7447 as per my previous post without a ULN2003, but now I have another question. I'd like for this clock to have a battery backup. I figured it'd be a simple task of adding a cr2032 along with a couple of steering diodes and a resistor to make sure that the battery voltage was a little lower than the supply voltage. That's not working, though. I am attaching a copy of the power supply circuit I am using. The 12v supply goes to the digit LEDs. The 5v supply goes to the SN7447. The only thing that the 3.3v supply goes to is the MS
  2. I thought about the 4511, which DOES show an operating voltage between 3-20v, but it's "high-output-sourcing-capability" is only 25mA... 10mA below the nominal operating current on a single LED.
  3. Well... loking at the datasheet for the 7447, it looked to me like it can handle 15v, or am I not reading that correctly? Yeah, the LEDs will be pulsed since the display is going to be matrix scanned, but I've never been a fan of dimming LEDs based on ambient light. Besides that, these LEDs are going to need to shine through a semi-opaque colored plastic, so they will need to be run as brightly as possible.
  4. I am building a(nother) clock with a custom 7-segment display. Each "segment" will be made up of two high brightness LEDs. The LEDs I am looking to use right now are blue (although I may use white) with a voltage rating of 3.2-3.8v and 35mA maximum continuous current and 70mA peak current. The two LEDs will be driven in series with the segments wired in common-anode configuration. If I power the 7447 with 9v, do you think it would be able to drive the display alone, or should I buffer that with a ULN2003? I tend to try and over-engineer things, so I wanted to get a second opinion before I
  5. I would recommend the AT supply over the ATX since it has an actual power switch. They're also more stable unloaded, I think. The ATX was just all I had laying around.
  6. For the trainer? There aren't any electronics inside except for the salvaged ATX power supply. The LCD and the panel meter are both self-contained single board units.
  7. Yeah, I did see that (3.6v) in the datasheet, but I have seen way too many components destroyed (or prematurely failed) because of pushing the too close to the limits.
  8. Really? I can do that, but I would have thought that a power supply designed for a computer would be safe.. No problem, I would much rather be safe than sorry
  9. Thanks, I thought so, but I wanted to be sure. Right now, I'm just going to connect to the launchpad like normal, but I am planning on running the USB out the back later on.
  10. Hi, guys... I just wanted to share with you a few pictures of a trainer lab that I built. I have several old Heathkit trainers (hence the color scheme of mine ) but I needed features they didn't offer, so... On a related note, the power supply I am using for this is a converted ATX power supply. The 3.3v line puts out about 3.4v. This should be OK for powering MSP ICs, correct? I was thinking of putting a rectifier in series to drop it down a bit just to be safe, but I wanted to get a second opinion.
  11. So basically, for my needs, I could just pulse the transmitter with a 555 timer when mail arrives, triggered by a magnetic reed switch?
  12. I bought a couple of transmit/receive pairs from China through eBay ( 433MHz Wireless Modules MX-FS-03V & MX-05 - http://www.ebay.com/itm/360770544267 ) and they come with no data at all. Searching, I have found a couple of Arduino pages using this module pair, but I don't speak Arduino, nor do I want to learn yet another language. Has anyone ever used these with the MSP or does anyone know where I can get technical data for these modules? All I want to do is signal wirelessly when (physical) mail has arrived at the mailbox, so I don't need anything too in depth. Thanks in advance.
  13. I just wanted to say thanks to every one and that, with a few VERY dangerous maneuvers with a table saw and a scrap piece of 2x4, I was able to come up with a descent slotted carrier for the launchpad. As soon as I get it finished, I'll post a photo..
  14. I didn't think about the fact that there are many different launchpad designs. I should have posted an illustration. I thought about the slots and the corner-pegs, but there isn't enough space around the edges. I really can't find enough room on the board to drill even a small hole, and besides that, since this will be a part of a protoboard, I really need more than one mounting point for rigidity. My board has the male headers, to which I plan on attaching a daughter board with a ZIFF socket, so I can't replace those with the female version. I suppose I could go with the piggybacking
  15. I never use the MSP430 launchpad board itself for anything other than programming my chips - I build my circuits around the ICs themselves - so I have never had to figure this out before, but I am building a development station (for lack of a better word) similar to the old Heathkit digital trainer labs. I want to mount a launchpad board on it, but with no mounting holes and very little clearance around the edges, I am at a loss. How do y'all mount these boards in projects? Thanks...
  16. Thanks, guys. I'll check those out.
  17. This may have been discussed before, but I couldn't find anything. Does anyone have any recommendations on a source for low cost, small run (no more than 10) PCBs?
  18. Here is the link to the project if anyone would like it - http://www.robotsandcomputers.com/robots/projects/nixieclock.htm @@cubeberg - I am going to have to get one of those VFD kits from you as soon as I get the cash up. Those are really nice!
  19. Tindie, huh? I think I have found my new second favorite web site (after 43oh of course) :grin:
  20. @@rockets4kids - I've never had any luck selling anything on Etsy. I had some cute little teddy bear earrings that were made out of capacitors and little men earrings made out of electronic components. Everyone that saw them always wanted me to make them a pair, so I thought why not try to sell them on Etsy. I tried to get $21 a pair (they took some time to make) and when that didn't happen, I tried to clearance them out at $12 a pair. Still not a single bite :-( @@tingo - The board is on top with the tubes below because the only tubes I had at the time when I started designing this were N
  21. Hi, guys... I am just curious - do y'all ever sell any of the designs you create? I ask because I have designed (and built of course) what I consider a very beautiful Nixie Clock based on the MSP430 and I was thinking about selling the plans for it. I have everything - schematics, code, Sketchup files, actual size templates, etc... This took a lot of time and, while I feel bad asking people for money, I do have a lot (of time) invested in this. I just wanted to get your opinion on this. Oh, and of course, I wanted to show you the clock :grin: I am going to add brass accents to the two fron
  22. I'll have to look at that tonight. Thanks!
  23. Has anyone ever experimented with recording short audio samples using the MSP430's ADC? I am looking to record a couple of samples from the Legend of Zelda of the treasure chest opening sounds and play them back when ever our deep freezer is opened.
  24. So this isn't a(n easily) incorporated chip outside of the launchpad board itself, like the msp430g series? This is an SMD IC solderered directly to the board? I like the idea of using just the IC like the older 430g, I build my circuits around just that IC, but I can see using this for certain applications, I suppose.
  25. lol.. yeah. I wish you'd have commented just a few minutes earlier the other day and I wouldn't have ordered this. I mean, it's a good book, I think, for beginners, and while I AM a beginner compared to most everyone here, it is a little bit "young" for me, so to speak ah, well... I'll review it and pass it on to someone else, I suppose. Thanks, though...
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