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  1. pier1

    Scripting

    Hello, I am new to computer programming. I would like to know the best way possible to start learning scripting. But I am confused with too many and different suggestions on the web. Could any of you with good experience with self learning share some info on this please ? I would also like to...
  2. pier1

    Air flow (CFM) calculation

    Hello, How do you calculate the CFM requirement of a FAN to cool a Heat sink ? I am making a small cool box using peltier elements. Thanks
  3. pier1

    Discharging Li-Ion batteries

    Hello, I work with some stand alone battery chargers for a project. I have some doubts on the discharge part of the Li-Ion battery. Generally we disconnect the battery from the load based on voltage sensing. My doubt is that Is there a concept called as current sensing also in the discharge...
  4. pier1

    Checking Mosfets

    Hello, While checking the N Channel Mosfet. I put the multimeter in the Beep mode (continuity mode) Probing the -ve probe at the Mosfet Drain (tab), the +ve probe at the Source pin - the multimeter reads 500+ ohms which is the body diode I think. Then Still probing the -Ve on the Drain I...
  5. pier1

    Lithium-ion battery Cycle

    I have a doubt regarding the charge-discharge cycle for Lithium-ion batteries. If the battery gets discharged to 50% and then charged to full, is it considered as one cycle? or if the battery gets discharged fully and gets charged again to full it is considered as one cycle ? Regards, Pier
  6. pier1

    Replacement for 2SK533

    Hello, I need an equal replacement for the part number 2SK533. This device is used in a Flow control board which is gone bad. I need to replace this with an alternative part and many vendors say that this part is no more manufactured. If any one knows about this part please contribute. I...
  7. pier1

    SMD resistors and capacitors Package

    Hello, I am in search of some sheet which has the package details of smd resistors and capacitors. Some sheet which contains the package dimensions for a quick reference. Please share some resources you guys know about. Thanks Pier
  8. pier1

    LED mood lighting

    hello, I am looking for the thread where AG had posted a corrected schematic of the RGB mood lamp which seems to be missing. Could anyone help posting the schemaic again (or may be AG could). Thanks much in advance Pier
  9. pier1

    Constant current battery charger

    I have a doubt. If I charge a 12 volt battery with a constant current regulator (120mA) using lm317,  The CC regulator is powered from a 15 volt 2 Amp power supply. The battery is a SMF 12v/1.2Ah type. will the current reduce if the voltage in the battery increases ? I have attached a diagram...
  10. pier1

    White led

    Hello all, I have a constant current driver 350mA with an O/P voltage of 40 Vdc, I want to know a way to test the driver without the leds.
  11. pier1

    Battery low voltage cut-off problem

    Hello, I am facing a problem in my circuit where I made it for switching of a light when the battery voltage reaches 10.55 volt. The battery is 12 volt 3.4Ah SMF type. The problem is: When the battery reaches 10.55 volt (roughly) the battery is disconnected from the load. When the battery...
  12. pier1

    Best Lab practices

    Does anybody have documents or links related to Best lab practices ? Some thing like how to use tools in the correct way or what to be used where and in which way. for Eg: When I used a skinned wire to connect it to a power supply, One of my senior told me that that was not the correct way to...
  13. pier1

    Thevenin's Theorem

    Hello        I've been reading the book of malvino ( electronic principles ) 3rd edition . I have a doubt and its eating up my head . Please help me to go further . Here is what it says THEVENIN
  14. pier1

    0-30volts Lab power supply

    I have made the 0-30 volts lab power supply which is there on this site . I want to know if it was possible to add a FINE TUNE provision for accurate selection of the O/P voltage . Please help me .
  15. pier1

    white led

    i need a circuit to drive 20 white led's of 5mm size . Can anyone help me ?
  16. pier1

    programming in the RGB led project

    I dont know anything in programming and want to make the RGB project in the site's home page . without learing the actual thing , is there any way to just do it for one time for an intrest . thanks and regards . Pier francis .
  17. pier1

    parallel port not working

    My parallel port is not working . some one said that it is blown off and another said try change the mother board . Could you suggest me to check what is the actual problem Regards Pier Francis
  18. pier1

    amplifier help

    I made an audio amplifier using tba810 ang that is not working . The circuit only works when my hand is touched over the body of the mic . or on the body of the potentiometer . Please suggest me a solution for this . Pier Francis
  19. pier1

    need help for cfl lighting

    i need help to make a circuit which consumes very less current for lighting up a cfl tube (9watts) with starter from a 6 volt battery . please help me .
  20. pier1

    cpu cooler

    I want to develop a Computer CPU cooler Please suggest me which peltier module to use and from where can i get assistance about how to develop the same . Thanks .
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