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  1. MP1

    How to Design A Solar Tracker?

    K-Master, Welcome to the forum. Solar trackers are pretty easy with micros. You just need a couple of light sensitive resistors and a bracket that points straight out that will cause one or the other to be shaded when the they are not both pointed directly at the sun. Then, you code the micro so...
  2. MP1

    Transistor tester

    It is a shame that you made it in ExpressPCB. No one will be able to make the board except ExpressPCB. Do you have them make all your boards or is there a trick to getting it to print out a board pattern so that you can make your own? BTW- Your file did not attach. MP
  3. MP1

    3-Axis Stepper Controller

    I was not aware there was a board layout in the project. Actually, there are two different projects in our projects section. I assume that since you have already tried everything, that this included moving the PSU and fan away from the board? Other than this and the posted ideas, I do not have...
  4. MP1

    Electronics Lab Community opened

    Just like you did here. Just press the "Reply" button, type your message and press the "Post" button. Am I misunderstanding your question? It seems like you already know what to do or this message would not be here. MP
  5. MP1

    3-Axis Stepper Controller

    Is it possible for us to see your board layout? MP
  6. MP1

    Want DIGITAL VOLT METER for AC

    If you follow the long multi-page thread on the digital voltmeter, an AC input was added and posted in that area. You can perform a search of the digital voltmeter or look for last several posts by maestrodamus as he is the one who posted it. MP
  7. MP1

    Loads of interesting circuits!

    Yeah, but we need to help out the newbies, too. ;) BTW..it is an excellent site for those who have not ventured to see. Somewhere here on the site there is a page of references posted all together, if anyone is looking. Should come up with a search. MP
  8. MP1

    Making an electric furnace.

    Wow! The casting of the dog looks almost like a real one!! ;D (Just joking) ;D ;D Dazza, looks like you have had quite a success with this project. Perhaps you could put it together in a "How To" form and Mixos could publish it on the site. Good Work! MP
  9. MP1

    seven segment display

    Most sensors are made to basically put out a voltage. What you are really making is a digital voltmeter. Yes, you will usually need a driver chip for each 7 segment display unless it is something like the 7107 which will feed multiple seven segment displays. You should look at the specific data...
  10. MP1

    Additional Information

    They are the many package types that the manufacturer offers for these chips. Sometimes it is easy to get lost. If you are only concerned with the through hole DIP package, the P or PDIP designation is the standard package. MP
  11. MP1

    3-Axis Stepper Controller

    RobiD, Describe your circuit board for the CNC. Is it mounted inside a metal container? Motors combined with digital circuitry is a hard combination in many cases. The circuitry must be shielded from electronic noise. You are probably right about this being interference from your Dremel. If you...
  12. MP1

    Printing Articles on this Site

    I haven't had a problem with printing the articles. When you click on "print", have you checked the setup of your printer? There might be a selection to center the page. All printers are a little different in the features they offer. Unfortunately, the more features you have, the more that can...
  13. MP1

    How to view and print PostScript files?

    Dazza, I have converted the postscript file to a pdf and attached it. MP
  14. MP1

    Additional Information

    An op amp needs both positive and negative supply voltage if the output is to go both positive and negative in response to a positive and negative input signal. If you do not have LM324: You can use the bipolar op-amps with a single supply if you use 1/2 VCC for the bias voltage. If you use...
  15. MP1

    design PCB using EAGLE

    Since the circuit is RF, you will want to cover as much area as possible with the ground plane. Anywhere there is open space on the board, you will want to cover with copper which is part of the ground plane. The missing resistor in the schematic can be put between pin 12 of the IC and connect...
  16. MP1

    Thermastat controled plugs

    I did not catch whether this was a new circuit which deos not work or if it is a circuit which was working ok but quit working. Would like to see the circuit....but in the meantime, here is a wild guess, provided it is a circuit which stopped working: With the power turned off and completely...
  17. MP1

    temp sensor

    Your temperature sensor will have a chart of resistance vs degree C or F. You will make a voltage divider circuit and calculate the voltage to the logger input from the divider for the various resistances and set a multiplier and offset to get a linear scale. Basically, the most common...
  18. MP1

    Cold Heat Soldering Tool

    Here is my hunch: It is more like a short circuit. There is a split in the tip and when you have a connection by the copper across the split, I think you are completing this connection which causes a short and thus gives you a high current. There is a spark like when you have a short. I have...
  19. MP1

    design PCB using EAGLE

    For your power pins, you need to go into the supply or supply2 libraries and choose the supplies listed in the error (V+ and V-). Put these on the schematic and connect them to a solder pad from the solpad library so that you have a pad connection to the supply lines. This is the only way to...
  20. MP1

    Pb-free soldering

    I buy bars of solder since I use a large quantity in my facility. I wonder if the obsolete bars will gain value like gold. ;D MP
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