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  1. MP1

    3-Axis Stepper Controller

    Hi Alberto, Please check the resistor locations. One is correct with the schematic but the other should be connected from base to emitter. MP
  2. MP1

    Latch does not work with transistor loaded

    vajirkar, what is the current needed for the relay? Perhaps you have chosen the wrong resistors and it is drawing down the supply. If you refer to the 10K as R1 and the 1M as R2, then: R1 = Supply Voltage / ( Maximum Current Required / Minimum HFE * 1.3 ) R2 = 10 * R1. MP
  3. MP1

    3-Axis Stepper Controller

    Hello alberto, You will want to connect the ground of all circuits to the same "common" connection. The drawing I have posted is for a relay which uses 12 VDC for the coil. If you have a relay that will use a different value of power, then you will want to change accordingly. Please note the...
  4. MP1

    Free sample chips!

    Yes, I have also gotten free samples from sensirion in the past. They still send me literature on new products. They do not send samples, now? Bummer! MP
  5. MP1

    Car Audio mini amplifier with 12 V Battery Supply

    Hello kamlesh, Welcome to the forum! There are many ways to do this. Have you checked the projects section on this site? There is a link near the top of the page. MP
  6. MP1

    neon bulb flashing ..............

    Here are some examples: MP
  7. MP1

    Led display Digital Voltmeter question

    mixos is correcting these as he gets the information from those who have actually built the device and given feedback. I assume that mixos has already made this correction. He spends a lot of time keeping the site up and running also. Send a private message to admin and he will be able to give...
  8. MP1

    3-Axis Stepper Controller

    1N4001, 1N4002, 1N4003, any of these will be fine as long as the watt rating is ok with your circuit. MP
  9. MP1

    Led display Digital Voltmeter question

    Did you read the fixes to this circuit that were posted in the "General" area? If this is all good, I would check the voltages to the chip and then check wires to the display. Since you had a working circuit and it stopped working when you moved the wires, I would recommend a real close look at...
  10. MP1

    schematics for IR remote for tv/vcr/dvd

    In case anyone has trouble on finding the schematics on the rentron.com site, I have found that you have to go into the description of the item, scroll down past the description and price of the kit and finally you will find a link for the schematic. They do not make it easy, but it is there. MP
  11. MP1

    3-Axis Stepper Controller

    Or a PNP version which causes the port pin to sink current instead of sourcing it. You can change the voltage and resistor values to suit your current/voltage needs. I never source current to a relay from a micro or computer port. I always sink. Micros are better at sinking than sourcing. MP
  12. MP1

    fast switch-off for transistor switch

    Why the 1M resistor? Start by changing it to 100K. This resistor value is generally used for stability and to insure that the transistor switch is completely turned off. This resistor insures that the base of the transistor does not go slightly negative which would cause a very small amount of...
  13. MP1

    Where to find LCD/LED displays

    LCD www.allelectronics.com www.earthlcd.com MP
  14. MP1

    transistors

    I would have said read the data sheets you have requested... ;D MP
  15. MP1

    Decision making before micro processors

    Here is the data sheet for the MIC502 in case anyone needs it. Also has a nice clear diagram in the data sheet for application. MP mic502.pdf
  16. MP1

    Decision making before micro processors

    Something like this? (See attached) MP Temp_Controlled_Fan_w-Thermistor.pdf
  17. MP1

    Playing with hydrogen

    You can also find info on this with a search for "fuel cells" on google.com since this is part of the process in a fuel cell. There are also articles here on our site: http://www.electronics-lab.com/articles/files/HYDROGEN_POWER.pdf and here...
  18. MP1

    C problem

    Here is inpout and all the associated documentation in a zip file: MP inpout32.zip
  19. MP1

    Posts

    Nope. Nothing happened. No lights ;D Congrats on your new title hotwaterwizard! MP
  20. MP1

    hmm

    http://www.fon.hum.uva.nl/wang/ThesisWangXue/chapter7.pdf MP
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