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# pier

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• Birthday 03/27/1985

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1. ## 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 know if 'C' programming is a must know for me to start off with scripting. thanks, much in advance
2. ## 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. ## 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 mode ? For example: like a battery is only allowed to discharge for a defined time in this current and this could help in increasing the life time of the battery ? I just happened to hear this from somewhere and am not so sure if this is correct. I googled around a lot and still not arrived at a conclusion ??? ========================================================== In the charging mode we generally look at the current rather than the voltage to cut off charging process. ========================================================== If any of you came across this topic, Please share your experience. regards, Pier
4. ## Checking Mosfets

Thanks AG for the reply. Any ways of measuring this gate charge ? Regards, Pier
5. ## 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 touch the +ve probe on the gate for a moment and then probe it back on the source it shows a dead short. I don't know why this happens. Any body knows about this, please share. The mosfet I used is FDD13AN0 from Fairchild initially I tried the same with the: BUK919 from NXP NTD5867NL and a couple more and all show the same. Regards Pier
6. ## 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. ## 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 am not able to find a datasheet for this part. All that I got is attached. datasheet2.pdf
8. ## SMD resistors and capacitors Package

that was very useful, thanks
9. ## 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. ## 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. ## 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. ## 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 for clarity on the configuration.
13. ## 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. ## 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. ## 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 is disconnected from the load the battery voltage rises a bit and turns on the relay again. This repeats and repeats. I don't know if the circuit I made is right. Could somebody help me to fix this ?
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