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  1. J

    IC temperature measurements - complex

    Heat in itself will not ignite coal or gas, but if the IC was to fail shorted, the resultant spark before the power goes out could easily cause an explosion in the right environment.
  2. J

    my daughter's science project

    my only issue with the phone pager is that you will need to pretty much keep the phone in one piece. I am sure the paging circuit is built into the phone circuit board. This doesn't make it very small or a pretty solution. But that certainly doesn't mean it won't work. Just build your circuit...
  3. J

    Weather detector/solar charger/wind up/Weather Band Radio Idea

    You said in the woods! Well I don't know, but where I am from in the woods means little light penetration through the canopy and since you are in CT, I am gonna assume the forest are no different then they are here. Solar in my opinion would be a waste of your energy. Now, if these woods are on...
  4. J

    What could be inside of this device?

    I laughed so hard I about lost my lunch.
  5. J

    Stepper motor rated voltage vs max voltage

    So then that would concur with the other statement that I read, as voltage across the coil increases the faster the speed achieved. I know you can set the rpm of these motors, so if current must remain constant then voltage has to increase. Now, I guess the last question I have, is why then...
  6. J

    Stepper motor rated voltage vs max voltage

    so is that then the rated voltage? How much voltage can I safely apply across the coil then? It just seems odd to me that most stepper drivers output higher voltages with less current. Why would the stepper motors be rated the opposite way. I think that is where I am confused the most at.
  7. J

    Stepper motor rated voltage vs max voltage

    I have been pondering on what type of stepper motors to buy for a project I have been putting together for the past couple of months. I found this website http://www.kelinginc.net/SMotorstock.html which has a ton of motors at what seems like reasonable prices. But I am a little confused on a few...
  8. J

    Useful calculators

    good find dave. I just yesterday ordered my 3 driver boards for my steppers. I was looking for a way to generate some simple g-code without having to try and learn a new piece of software in the process. Their g-code generation for milling and drilling is quite simply exactly what I was looking...
  9. J

    I discovered hidden audio device in carbon monoxide detector

    What is your point in proving that it has been modified? You make a lot of assumptions, at first glance of the title I thought you where gonna say someone was spying on you. Sometimes manufactures have certain parts still manually soldered, that may be what you are seeing and has nothing to do...
  10. J

    Improvements and Suggestions

    I guess an example of what I mean might help some. In google you can use quotes to refine your search to more specific info. Right now the search feature on this form searches for each word individually and there is no way to exclude a term from the search. In that way the search feature on this...
  11. J

    Improvements and Suggestions

    I would like to see the search feature improved. I don't know exactly what you could do to improve it since is probably part of the forum code, but as it is right now it is pretty useless. Returning a max of 100 results when you search for something like "relay" is not very helpful when the...
  12. J

    Turn heat on with cellphone

    I guess you could do all that gsm, but all you really need is to trip a relay or some sort of switch to enable the heater. Do you need to turn it off with the cell phone? I remember there was a thread on here where someone used the power to the speaker to drive a transistor that drove a relay...
  13. J

    Question on step motor control

    You pretty much have everything you need to drive that stepper right there, The L6201 is a full bridge driver with the typical short circuit logic circuitry. The other IC is probably for the microstepping or sequencer??? I have just recently started looking into these motors myself. maybe...
  14. J

    Project Log Section

    ok, there is some issues going on here. First off I posted a test reply in the project log section and it worked. When I tried to reply to a thread in the discussion sub-forum I was told I had no permission, but yet I can start a new thread in the discussion sub-forum (which I don't think is...
  15. J

    My module psu design

    You said that the rectifier was in the second module, but yet you also say that there is a 7805 in the first module to run the DC fan. So I am to expect that you back feed DC from the second module to the first module to run the DC fan?
  16. J

    would this be how i hook up a relay to run a fan?

    You need to wire it into something that is only active when the key is turned on. Ignition switch would be ideal, but it might be hard finding room on the ignition switch. On some bikes the main headlamp will only come on once the key is in the "on" position, this then becomes one circuit on the...
  17. J

    Project Log Section

    Very nice work ian and to whomever suggested it. We will see how it works, but plenty of forums could benefit from this at first glance.
  18. J

    Old VCR's

    I am totally looking for old vcrs, scanners, and printers right now. I have thrown at least 5 out over the years and now that I want to make a 3 axis cnc machine bed, of course there is nothing to salvage motors from so I can start testing out this micro-controller before I go full scale. Had I...
  19. J

    Web internet search

    Have you ever heard the term "spidering, webcrawler?" http://en.wikipedia.org/wiki/Web_crawler all search engines use some form of this process to collect data so you can search it. It is an ever ongoing process, which is why google now sees your threads here on electronics point forum.
  20. J

    A diode for my heating/hot water?

    I think you can keep the wireless thermostat, but if it was me I would look into new controls for your specific setup. But running the boiler less then 24/7 should easily pay for the cost of new controls and valves if needed. Something to think about. Call an expert and get a quote, while he is...
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