Search results

  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

    Thanks AG for the reply. Any ways of measuring this gate charge ? Regards, Pier
  5. 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...
  6. 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
  7. 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...
  8. pier1

    SMD resistors and capacitors Package

    that was very useful, thanks
  9. 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
  10. 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
  11. pier1

    Constant current battery charger

    Ok then I will increase the input voltage to about 18 or 19 volts. But I need to keep the battery at 13.55 as full charge condition, So I wanted to know wheather charging current automatically drops when voltage rises.
  12. 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...
  13. pier1

    White led

    I dont have a schematic because I bought it from an electronic store, The store owner told me that it could withstand Short ckt. I dont know how far its true. I think I would try the 100ohm power resistor.
  14. 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.
  15. 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...
  16. 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...
  17. pier1

    white led

    Me too live on the ground  ;D. Water here reduces a lot in summer and Hydro stations are affected.
  18. pier1

    white led

    Due to summer season there is power cuts here . They call it load shedding. So need to prepare for it.
  19. pier1

    white led

    Hi AG :D :D :D ;D I dont live in a tree. I have a 13.5 volt 1.5A battery charger so that charges the battery and also lights up the leds. So when the power goes off it lights for some time taking back up from the battery. My previous image had some wrong calculations. In the image shown here i...
  20. pier1

    white led

    when the mains is off and all leds are also off the voltage across the capacitor is 117 volts DC (reducing very very slowly) . The capacitors i used is 10uF/450volts, 3nos in parallel which makes 30uF.
Top