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  1. MP1

    Need cross for MC34063 chip

    AnaChip AP34063 Bay Linear B34063 ADD Micro AMC34063 It looks like a lot of companies make it. Just try different manufacturer letters and keep the numbers. Hope it helps. MP
  2. MP1

    What resolution are you using?

    I access the site from a few different computers. One of these does use 600X800 and it is a little more work, but this does not bother me that much. I just move the pane so that I see the post and not the icons on the left. I have more problems with the pages loading slow. I have a pretty fast...
  3. MP1

    handy tip for intefacing your PC with projects

    Yes. I/O refers to "Input"/ "Output". Ports are capable of two way communication. MP
  4. MP1

    sensitive low frequency filter

    Let's see what you have so far. It might just be a simple modification. Any chance you could put a sketch up here on the forum? MP
  5. MP1

    motor controller protocols

    Kevin, look here for info on steppers: http://www.cs.uiowa.edu/~jones/step/ MP
  6. MP1

    Looking for to buy a schottky diode

    Sotris, You can purchase the BAT29 here: http://www.danssmallpartsandkits.net/ http://www.electronicpool.de/list/index_B_A_BAT42_STM.html http://www.electronicpool.de/list/index_B_A__.html The part number is not in the correct order on the third link. You must keep scrolling through the parts to...
  7. MP1

    OPAMP questions

    I have never looked at this as a leniency. I have always looked at it as versatility. That is what makes the op-amp so popular. But there are rules. There are lots of publications regarding the use of op-amps and complete libraries of circuits built with them. MP
  8. MP1

    motor controller protocols

    Here is a site that might interest you. The author is using AVR with the program written in basic. Very similar to using the PIC and very easy to read. Perhaps you can pull some information from it. He has a serial port controlled stepper as well. http://home.planet.nl/~meurs274/ MP
  9. MP1

    5 volt regulated power supply HELP!!!!

    Kevin, the zener in this schematic is setting a reference voltage at the base of the transistor. This is a common use in power supplies. MP
  10. MP1

    motor controller protocols

    Steppers will not receive a serial protocol. They do not have any smart circuitry or logic in them. Just coils and the magnet basically. Whenever you see a serial communication to a stepper, the serial communication is sent to a micro or motor controller chip and the chip sends the data to the...
  11. MP1

    motor controller protocols

    What kind of information are you looking for regarding the steppers? I am not sure what you mean by protocol. MP
  12. MP1

    Open Circuit Test

    I like simple when I can get away with it. ;) MP
  13. MP1

    Weird chip problem

    SGS Thompson made several power amp chips like these which were a TDAxxxx, where the x is a number. You might try a cross there, and then try to cross a TDA number over to NTE as they seemed to have quite a few of their equivalent parts. I will also keep looking in some of the data I have. Here...
  14. MP1

    sensitive low frequency filter

    No. That is not a problem. This is ok for an op-amp. You cannot look at an op-amp as if it is a transistor. MP
  15. MP1

    DTMF transceiver connection

    Further to my last reply: You should not connect anything "directly" to the telephone line. You should use the small transformer which is common for telephone line connection. In most places, if your circuit causes a problem with the telephone company's equipment, you are liable for the...
  16. MP1

    DTMF transceiver connection

    You are correct. But there is not a different schematic for each operation. I have attached the data sheet. The information is there for both types of operation. MP CM8880.pdf
  17. MP1

    sensitive low frequency filter

    Are you referring to the one I posted or the one russlk posted? MP
  18. MP1

    DTMF transceiver connection

    It is my understanding that this device is used to decode DTMF you "receive" so that it is usable. "Sending" DTMF is just a matter of sending tones. You would do this with a tone generator type of circuit. MP
  19. MP1

    Led display Digital Voltmeter question

    If you download the Eagle layout files, you can move the parts on the board. Breadboards, Veroboards, etc. are boards with multiple holes on a 0.1" pattern. You could edit the board layout by removing the traces, then moving all the parts so that they match the 0.1" pattern. ..or you can delete...
  20. MP1

    When to use a heat sink

    You are correct that there is also a small heat sink on the board in the picture. The text shows that there is much on-board short circuit protection and does not mention heat, so I do not see the reason for it. Perhaps the author was playing it safe. Would those who have built this project...
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