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  1. MP1

    Free sample chips!

    ...and one more MP
  2. MP1

    Free sample chips!

    Here are some examples. If you can make your own boards, it is even better. MP
  3. MP1

    Free sample chips!

    For prototyping purposes, you should get proto boards with the footprint of these chips and solder a couple of headers onto it to make it a dip package. Then it is a plug-in dip and you have not wasted it. Soldering is not too bad on these small ones if you use a lighted magnifier and plenty of...
  4. MP1

    Lowpass filter for subwoofer

    I agree belong, however, it can also cause your project to go up in smoke if you experiment the wrong thing. As staigen pointed out, it is helpful to find tutorials and to read some publications before jumping into something you are totally clueless about.  pfoooof!!!! If you let the smoke out...
  5. MP1

    PCB Etching Tank - Do it yourself

    Wow!  :o What were you using for aeration? I have had a pcb lab for more than 20 years and I have always used a low power air line from an air compressor connected to a manifold in the bottom of the tank that allows for even aeration throughout the tank. i.e.- even flow of tiny bubbles. Have...
  6. MP1

    Ante 50 Years Young

    Happy Birthday Ante! How fast time goes, huh? MP
  7. MP1

    PCB Etching Tank - Do it yourself

    Ferric Chloride is the safest of all these chemicals. When you start messing around with these other chemicals, you had better know something about science. Be careful to not cause an explosion or injure someone. Ferric Chloride does not need ventilation unless you exceed the heat range...
  8. MP1

    Electronic locker

    post a link to the project MP
  9. MP1

    If You want interesting gadgets

    so why don't you be helpful and post some links instead of being so down on another member of this community. MP
  10. MP1

    Lowpass filter for subwoofer

    frt, I suggest that you contact the author of the project at his email address: [email protected] He will be able to tell you about his tests of the project and also will be able to give you details of the parts that he used for the project. It seems that this is the basis of your...
  11. MP1

    Led display Digital Voltmeter question

    You should check the data sheet to see if the chip has the accuracy you need. This is a simple matter of research and you should do this yourself. MP
  12. MP1

    Plants wattering watcher

    No disrespect, staigen. I am not an expert in compost, but as I understand it, the reason a flashlight type battery will ruin compost is because of the heavy metals. Not a dc charge. A nicad or flashlight type battery will have enough heavy metals to ruin a fairly good sized compost pile. This...
  13. MP1

    building project

    Also: http://www.interq.or.jp/japan/se-inoue/e_eagle.htm http://www.precma.com/informatica/tutorial.htm Hope these will help. MP
  14. MP1

    building project

    http://myhome.spu.edu/bolding/EE4211/EagleTutorial4.htm MP
  15. MP1

    Temperature Probe

    You wouldn't actually be hooking these up to the screen. You would connect to the micro and display to the screen. You can display anything you want on the two lines of the display. You could read 4 sensors with the micro and display each temperature on separate lines of a 4 x 20 or 4 x 16 line...
  16. MP1

    Temperature Probe

    airborne, Here is a link that will help you on connecting a temp sensor to a micro using a free basic complier and in-circuit programming so that you will not need a programmer board. Of course, you can also use a chip with an on-board Analog to Digital converter and not need the adc chip...
  17. MP1

    HDD+WEBCAM+MIC >> MOVIECAM ??

    A webcam and a hard drive are both dependent upon some type of "traffic director" so to speak. In most cases, you woudl use a computer to connect with these items since you can use a program to sense different parameters and to send out signals to cause the different things to happen. You can...
  18. MP1

    Voltage level shifting

    The difference between my post and Staigen's is the addition of calibration adjustment. Also, the second op-amp is there to isolate the sensor circuit from the other electronics. Your sensor will drift with temperature and with time. A fixed resistance might be fine if your circuit never leaves...
  19. MP1

    Voltage level shifting

    Yes, you 'have' missed something. Go back and read them both again. MP
  20. MP1

    5ohm 20watt resistor

    It looks like they do not keep the search criteria in the link for very long at Digikey. Hmmm....I did not know it expired. It is a Digikey part number HLWB-5.0-ND. It is a 5.0 OHM 5% 20W TUBULAR Wire Wound Resistor @ US$ 3.38 for qty 1. Here is the datasheet from the manufacuter, Vishay...
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