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  1. MP1

    Eagle PCB Software

    As far as I understand, you would have to create the parts in the schematic editor. Otherwise the schematic and board would not be able to match. Then you could lay them out in the board editor and auto route the parts. I do not think there is an easier way in the more advanced programs. In a...
  2. MP1

    Water Leak Detector

    Here is a start. Hope it is helpful. I am not sure where it came from, but I think hotwaterwizard posted it originally. MP
  3. MP1

    Log voltmeter

    A simple op-amp with a NPN transistor and small switching diode in the feedback loop makes a logarithmic amplifier. You also need a small cap there to keep the circuit from going into oscillation. It is called a transdiode logarithmic amplifier. Try this in your word search and you should find...
  4. MP1

    interface circuit with computer

    There is a third option: build your own card which communicates through the parallel port. You do not need a mirocontroller to communicate with this port. The parallel port, for example, has inputs that you can access with an A2D chip such as the 8 channel/8 bit ADC0809. A person with...
  5. MP1

    how can do a good lab report ?

    Please allow me to add my comments here as well: The basis of the lab report will, of course, list the items for which you are testing. Voltage, power, amplitudes, etc. This is dependent upon the reason for your test. These are for your advertised specs. However, other items which are common...
  6. MP1

    Led display Digital Voltmeter question

    Look for the thread on the digital voltmeter corrections. A schematic was posted showing how to convert it to AC/DC input. It was posted here: http://www.electronics-lab.com/forum/index.php?board=13;action=display;threadid=1516 MP
  7. MP1

    PCB layout??

    Draw the schematic into a program that will allow you to pull the schematic directly into a board layout. One which has an auto-routing feature would also be helpful. This is not a difficult schematic, so it would be a good one to learn schematic capture. There are lots of free schematic...
  8. MP1

    3-Axis Stepper Controller

    Mikromike, I have never used the software package you are using, so I cannot comment on that. However, I did want to mention that by testing functionality with the 555, you have verified your CNC hardware is ok and that the problem is isolated to the computer. Are you sure the software is...
  9. MP1

    Cheap and easy acquired Capacitors and Resistors from China

    Alex, No offense here. This is why we have a buy and sell area on the site. Thank you for posting in this area. I am sure some of the members of this community will be interested. I do not understand how someone can put money on your visa card, though. How does that work? Aren't you taking a...
  10. MP1

    ps/2 to rs-232(serial port)

    Unfortunately, there is a lot more difference in these two protocols than the speed. Serial is only the method of the transmission. It only means the bits are run through the cable one after the other. It takes a lot more than this similarity to get compatibility. For example, you still have to...
  11. MP1

    ps/2 to rs-232(serial port)

    PS2 does not use the same language as USB, but here is some interesting reading if you want to learn more about PS2: http://govschl.ndsu.nodak.edu/~achapwes/PICmicro/PS2/ps2.htm MP
  12. MP1

    3-Axis Stepper Controller

    V/R = A MP
  13. MP1

    Printable multi-layer circuits

    I have made boards with the normal thickness as well as the thin material. The thin material has been around fro quite some time. It is a real pain to etch. If you are using an etch tank, the material tries to flop around with the agitation of the bubbles. It has to be secured well or it will...
  14. MP1

    DC 12 Voltag to 24 DC

    Thanks MP
  15. MP1

    ps/2 to rs-232(serial port)

    A PS2 keyboard does not use the RS232 protocol to transmit data. MP
  16. MP1

    3-Axis Stepper Controller

    These two power resistors are used to limit the current to your steppers if this is needed. Figure out how much current your stepper can take and use this resistance to keep the controller below this amount. It is not published because you will have to calculate it from your stepper specs. If...
  17. MP1

    Which impedance?

    It would be dependent upon the power amp that you connect to the output of this chip. This project is a good front end, but I do not think it was intended as a stand alone unit. MP
  18. MP1

    Phonline Diverter (my first project)

    ...and there is a reason why they have an alarm to detect if you are using too much ring current. BTW, the isolation also protects the end user. The 48V DC voltage in telephone lines does not cause immediate danger to the user, but the AC ring signal (70-120V AC) can give quite a shock...
  19. MP1

    digitan multimeter software

    This might be a long shot, but if you cannot find the software, try to connect with HyperTerminal. Choose the correct commport. Change the baud rate to what it calls for in the manual and be sure to change "flow control" to NONE. Then see what comes to the terminal window. Many industrial...
  20. MP1

    Phonline Diverter (my first project)

    I did not really follow your drawing well, but here is a link that can explain more about the telephone lines, what voltages they draw, why you need isolation, etc. Perhaps it will help. I would personally never connect to the phone system without isolation...
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