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  1. MP1

    ask for help

    Unique is a pretty vague term. It means different things to different people. Try to be more specific when asking for help. MP
  2. MP1

    Smart Card Pin-out

    Hi Rhonn, I am not sure if all smart cards are standard, but here is the pin out that I have for interfacing to micro. MP
  3. MP1

    3-Axis Stepper Controller

    Alberto, you can add a 12 volt regulator to the circuit if you find one that is rated above your output voltage. Another way to step down the voltage is with non polarized capacitors on the secondary output of the transformer. You connect capacitors in series across the secondary of the...
  4. MP1

    Another INVERTER we can talk about..

    Time for you to get a new slide rule. If environmental and meteorological equipment was built upon the same assumptions, the industry would be a mess. I never disagreed that the relay would turn off his power. He still has resistance to ground. If you look at the components as resistors, and...
  5. MP1

    Another INVERTER we can talk about..

    No need to be sorry, audioguru. Show the math. Thevinen's theorem would not agree with your statement. This would be like a parasitic draw on the battery. It would also tend to add other problems in the future. All it takes is a simple add on to isolate the battery. Not a big design add-on. Why...
  6. MP1

    Another INVERTER we can talk about..

    That is not isolation. The circuit is only turned off. If he were to use a DPDT relay, and the second section was where the fuse is, then this would be considered isolation. Isolation means not connected. MP
  7. MP1

    remote control using radio freq

    Keile, Perhaps the attached will give you a start. MP 4_Channel_UHF_Remote_Control_ck1616.pdf
  8. MP1

    Another INVERTER we can talk about..

    Sasi, nice inverter drawing. Are you using a 24 Volt supply? I see + 12V and - 12V Battery connections on the drawing. Or does this refer to the + and - posts of a single 12 volt battery buss? Here is also something to consider on your inverter projects: Bigger is not better as in what you get...
  9. MP1

    Another 4watt Transmitter Question

    Marvel, looks like the picture picks up where the instructions leave off. This happens a lot with the Smart Kits, though. MP
  10. MP1

    Another 4watt Transmitter Question

    Marvel, I do not know how the author made the original coils, but it is common practice to use the insulated wire and wrap close unless told otherwise. In regards to the T1 substitution, here is the quick comparison on one page. Looks like mW is lacking on the 2222. You will have to do a little...
  11. MP1

    sram controller

    Qual, if you are considering a microcontroller, you might look at the Application Notes area of the mcselec.com website. There are examples of code to access hard drives, SRAM and SD Card with the AVR chip using Basic code. MP
  12. MP1

    HELP!!! im new hir!!1

    luzell, since this is an International forum, you might like to know that many members will not have a clue as to what you are saying with your "short slang computer typing". Those who use interpreters will only get back jibberish. Let's be kind to others and type normally, ok? MP
  13. MP1

    modify the 8-channel PWM controller to 3 channel???

    Yes, as GPG has stated. The strobe, which is active low causes a connection of all stage emitters to ground. If you do not use this, then you can simply tie the emitters of the BC547s to ground. If you have an outlet to digikey without crossing customs, I would recommend that you use it. I have...
  14. MP1

    lm337t

    Kevin, Here is the data sheet. MP LM337.pdf
  15. MP1

    3-Axis Stepper Controller

    I think that article will be fine if you choose the right relays and the right LEDs. Unfortunately, the article did not list part numbers, so you do not know what they had in mind. It all depends upon the relay coil resistance and the current MAX rating of the LEDs. MP
  16. MP1

    modify the 8-channel PWM controller to 3 channel???

    The site shrinks the size of images which are too large to view. When you click on the file name, you will see the enlarged view. If you only want three fan sections on this schematic, just use sections D0, D1, and D2. Then you should change the control software so that it only sends a signal...
  17. MP1

    Newbie looking for diy capacitor sites

    there was a discussion on this forum about making your own capacitors. The search feature at the bottom of this post should help. MP
  18. MP1

    3-Axis Stepper Controller

    Looks much better! The only thing I am not sure about is the LED. The LED drop down resistor is going to interfere with the coil resistance of the relay, depending upon the value. You will have this resistance and the coil resistance working in parallel. If you look at the parallel formula for...
  19. MP1

    Is It Possible To Make the DVM Portable?

    Which project? The one on our site or another one? The biggest hog for current is always in the display, so if you add a circuit to turn off the display after x amount of seconds, you will save some there. MP
  20. MP1

    LED Display VoltMeter

    If you have Eagle PCB Layout, I can send you the board and schematic layout. All you have to do is print and etch a board. MP
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