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  1. MP1

    circuit design

    This refers to the current flow in the windings of the motor. If you ground this pin, then the motors will be turned OFF. This option is available so that you can connect a safety switch if needed. MP
  2. MP1

    relay question

    Your relay is made by Panasonic. It is a 12 VDC / 5A relay. Here is a link to the data sheet that will help you understand the markings on the case and what they mean. http://www.alliedelec.com/Images/Products/Datasheets/BM/AROMAT/Aromat_Industrial-Control_7881012.pdf MP
  3. MP1

    rosin flux

    You do not want to breath the fumes from the flux. Yes, it is considered a carcinogenic. You can find this information in the Material Safety Data Sheet (MSDS). All manufacturers must provide an MSDS sheet if you ask for it. Here is the MSDS link to one brand of flux...
  4. MP1

    line filter

    The fax tone is only the handshaking signal. None of your fax message is on this tone. After this signal is transmitted and both devices have told each other they are connect through these tones, the data is sent. This data is sent on the same line as your voice, so there is quite a bit more to...
  5. MP1

    LCD pinout?

    What is the brand and model number? Are there markings on the device to indicate this? MP
  6. MP1

    What are Solder Pots used for

    I am certainly a believer in plenty of flux. Requires some alcohol clean up afterwards, but I always use plenty of flux. A gracious amount of flux when desoldering, tinning or assembling a board makes solder joints much nicer looking and much cleaner when you are finished. Gets rid of blobs and...
  7. MP1

    What are Solder Pots used for

    No. It leaves a nice clean shining coating of solder on the wire. First dip the wire in some flux, then into the solder pot of melted solder down to the insulation. Only dip it for a second and pull it straight up from the pot. When you pull the wire out of the solder pot, it will have a nice...
  8. MP1

    What are Solder Pots used for

    Here is one like what I use on my workbench for tinning wires. I purchased mine directly from Techni-Tool. They come in various sizes, but I only need a small one...
  9. MP1

    car battery tester

    I recommend that you just go with the settings in the project. It sets the first LED for 8 volts and sensitivity of the circuit. The LM3914 data sheet will help you understand this better. MP
  10. MP1

    Simple help with transistors!!

    Sounds like you are just wanting to use a bipolar transistor as a switch for a relay. Perhaps this short tutorial will help. (attached pdf) MP Transistor.pdf
  11. MP1

    ferrofluid in stepper motor

    There was an article discussing this in "Motion magazine" in the September/October 1992 edition. It is Volume 8, Number 5. The article was titled, "Ferrofluid-Filled Stepper Motors" by - K. Raj and Richard Powlowky. I do not have a copy of the article, but perhaps you can find it with this...
  12. MP1

    Drilling PCB?

    I certainly have to agree on that point. For a one time board project, the cost of bits for 5 or 6 different hole sizes would not justify the cost to make 1 pc board. One could have a board house produce the board at nearly the same cost. (Hey, nothing wrong with a Chevy truck. Have a...
  13. MP1

    Inverter Question

    I wouldn't bother with the many square wave inverter schematics posted all over. Square wave is not good for some equipment. All AC appliances were made to be run on a sine wave. Although this does not matter for some equipment, it will certainly make a differences in others devices. You could...
  14. MP1

    [help] Getting pure DC current

    draggy, I am pretty sure 6 volts is a maximum value for your PIC. If your batteries are exceeding this and your meter is not showing it, this is not good for your micro. Check your spec sheet for more specifics on this. In most cases that I have seen, where a PIC gets hot, it is due to...
  15. MP1

    Serial communincation between two Microcontroller using IR

    ok.
  16. MP1

    Capacitor Voltage

    Wow, I totally forgot about this thread since SM2 never answered. Yes, if one was to replace a low ESR capacitor with one which was not low ESR, this could certainly be a problem since ESR is the sum of in-phase AC resistance. However, I read the original post as replacing a standard...
  17. MP1

    Drilling PCB?

    My 2 cents: One thing I like about the carbide bits better than the high speed steel is that they will usually break before they ever dull. With high speed steel, I noticed the bits would dull fast. Even more so if you use paper phenolic boards. This would end up leaving me some holes with black...
  18. MP1

    Preparing for the corporate world

    I would suggest that you try to make room in your schedule for at least one work study per year of your last two years. If you can put more time in, then all the better. It is hard to put a lot of time into work study because you still must maintain your other coursework. I will say this: Most...
  19. MP1

    Type of heat sensor used in a digital clinical thermometer

    The answer to this question is determinate on the accuracy of the device. All of the devices you have listed are used in one lab device or another. For best accuracy, many will use a platinum probe (RTD). Many devices will use a thermocouple. More expensive thermistors can give you +/-1 deg C...
  20. MP1

    Preparing for the corporate world

    Most colleges offer some type of work study program where you get credits for working in the field that you are studying. This is the best preparation. The employer benefits because they do not pay you and you benefit because you get credit for the work performed. You also get an inside look at...
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